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Showing content with the highest reputation on 13/05/13 in all areas

  1. 7 points
    Lots of activity on view on this occasion. That huge, wide filament was very impressive. Pete
  2. 5 points
    An early morning shot of the Milky Way in Sagittarius and southern Ophiuchus as it culminates over my southern horizon outside my front yard. Skies were relatively clear. This was a 60 second exposure with my 50mm f/1.7 @ 2.2 using ISO 800. The Pentax K-01 seems to be a great astrocamera stock not modified. Thanks for looking!
  3. 5 points
    The Bubble Nebula, NGC 7635 (SH162/Caldwell 11) Hello all. It's been a while since my last image as I've been getting to know my new scope, and am very slow when it comes to processing anyway! This is one of my favourite targets, and I imaged it back in 2008 with a 14 inch Meade so it was interesting to see how the new scope fared against that ..... Here's some information to put the image into context. This 10 year diameter bubble is being blown out of the surrounding molecular cloud by the massive star SAO 20575 (BD+60 2522). This is what's known as a Wolf-Rayet star, a young, massive and extremely hot star that’s burning its fuel rapidly and is approaching the supernova stage. It’s thought to be between 10 and 40 times as massive as the sun. It’s the bright star in the bubble, but isn’t at the centre of the bubble due to the different densities of the surrounding material. The bubble is being produced by the solar wind from the star, estimated to be at a speed of 4 million kph. The UV radiation from the star is ionizing the gas causing it to glow at a temperature of about 10,000K, which, when you consider the size of the region, gives some idea of the tremendous energies involved. A second, larger bubble can be seen in this image, the edge of which is next to the bright blue star in the lower right. The nebula is 11,300 light years away near the constellation of Cassiopeia and was discovered in 1787 by Sir William Herschel. I had a right battle processing this due to the fact that throughout the few weeks I was imaging it, I was adjusting collimation on the new scope, with varying degrees of success. Consequently, the stars were different shapes to some extent in the different colour channels, so there was a fair few hours of fixing involved Telescope. 12 inch custom Ritchey Chretien @ F5.3 Camera. Atik 460EX using Baader filters H-Alpha. 32 x 10 minutes OIII. 18 X 10 minutes RGB, all 3 minutes each, 12 red, 12 green & 25 blue. All subs binned 2x2. Imaged in January and February 2013 from Dorset, England. The full sized image can be found on my website. Cheers Rob
  4. 5 points
    This is the first semi ambitious project from the new FSQ106/Atik 11000. It's a 2 panel HaRGB mosaic including the Butterfly nebula and the Crescent. It can be extended at will in any direction! The scale here is huge, around 4.6 x 4 degrees. As ever, the battle was getting the stars under control in this rich Milky Way region. Cheers, Olly They can be seen in various resolutions here; http://ollypenrice.smugmug.com/Other/Best-of-Les-Granges/22435624_WLMPTM#!i=2509738821&k=CfnB53z Olly
  5. 5 points
    Imaged over a week ago, I only manage to get around to processing it last night. It is my first Globular, and I found it quite hard to process, getting the blue and yellow stars to stand out. Worked out quite well, and I'm really pleased with it. http://www.astrobin.com/full/41785/?mod=none 20 x 5 minute subs. Erik
  6. 4 points
    Somehow seeing the real commander of the international space station doing a cover of David Bowie's Space Oddity is very moving...
  7. 3 points
    Well, I did my research and this seems a popular target for the narrow-band addicts. I think it's a bit like fishing though - you have to be patient... I took these subs 10 days ago, over 2 nights, but have only just processed them - please go easy, as I've got a lot to learn here, and am on a steep curve with the pixinsight demo. I haven't got automation, but did suss out that I can get the scope to park nose down when it gets close to hitting the tripod with EQmod, so the Oiii subs here were taken while I was asleep (people at work were starting to think I was moonlighting). Did set my alarm for 0500 just in case, but all was well. After taking the Ha subs the previous night I needed some sleep. 7 by 30 mins Ha (unbinned) and 4 by 30 mins Oiii (bin2). The both the green and blue channels are straight from the Oiii. Won't put Olly out of business, but this is a new PB for me. Taken with a 460ex and Wave 115 refractor. (I know I can't do NB with the DSLR).
  8. 3 points
    Haven't got time to process up the full disc today as it's S@N filming day, but I'd like to share with you AR11745 from this morning and the hint of a new AR coming around the limb. I'm assuming (and I haven't checked!) that this is the group which recently showed enhanced flare activity.
  9. 3 points
    Skywatcher Esprit Pro 150 teamed up with Atik 460ex and Baader narrowband filters. I don't have a massive amount of data for this, especially in S2 and Oiii, but wanted to move on to another target as I have just acquired a colour 460ex. The Esprit delivers really crisp images, really sharp edges to the bright parts of these emission nebulae, and this is something I have been looking for for some time. As a die hard reflector fan I have to grudgingly admit that I actually prefer imaging with this refractor at this focal length. I'm really looking forward to using the 150 with the 460ex OSC, I think they will be nicely suited. I'll upload the full size to astrobin later, but here's a 30pc preview for now, just a little murderated by the forum compression Thanks for looking Tim
  10. 3 points
    A shop, you say? I've heard of those. They're sort of a bit like Amazon, but with pictures you can touch? James
  11. 3 points
    I read somewhere on this forum that a fella's will stated "sell my kit for what's its worth, not what I told you I paid for it!" Made me laugh. Barry
  12. 3 points
    if i order some astro gear i always hide it behind the hoover she will never find it there
  13. 3 points
    I did see a thread on these play tiles being used in an obs setup to provide some impact protection around the pier - having seen Alan Pott's recent thread (Not a Good Week for Televues) on dropping the APM of the mount, it could be a few quid very well spent. Not sure about the appropriate PPE for the accident prone astronomer - but this would seem to cover most eventuallities and keep you warm: You can even velcro the Synscan controller to the handy wrist pad Seriously though on the play tiles side - my kids have some coloured ones for playing with in the garden - I use these at night to keep my electrics off the ground (under the tripod) and around the mount as well as preventing me from treading the mud back in to the house, provide a dry kneeling position for polar alignment, but if you do drop something its a lot easier to find in the dark.
  14. 3 points
    The obsy is now close all around - the door and the panels around the door - installed. Moreover, the piles and beams to support the roof when travelling, are ready. Next steps: installing the metal rails for the roof, finishing the roof, starting to work on electric outfit, starting to work on wooden floor, painting everything. Last steps: installing the closing sheets (corners, around the door), installing, programming and computer linking the roof motor, installing the mount The very last step: PARTY.
  15. 3 points
    The f number is a photographic term and if you did visual only it may be considered to be of little relevance, not quite irrelevant but less of a concern. A 150mm scope of f/10 will collect the same amount of light as a 150mm scope of f/5. The aperture of both is the same 150mm. A 150mm scope of f/10 has to have a longer focal length then a 150mm scope of f/5. The focal length determines the size of the image formed at the focal plane, basically (but not quite) double the focal length and the image size doubles etc. So the 150mm f/10 scope produces an image that is twice as big as the one formed by a f/5 scope. However the scopes have the same diameter so that image of the f/10 scope is dimmer then that of the f/5. In photographic terms that means the exposure time has to alter. If you stick an eyepiece in the way then it goes out the window. A 150mm f/10 scope set up to give 100x will give an image the same size and brightness as a 150mm f/5 scope set up to give 100x. There are characteristics associated with a fast scope and a slow scope, but for visual no real hard and fast rules. For imaging then it is more relevant. f/6 is a little on the fast side, but there are faster. Fast scopes tend to need a bit more time spent on keeping them set up, but they are shorter (aperture being the same) so a little easier to move round. My personel preference is for something around f/7 in either refractor or reflector. Although practicality has to come into it - an f/7 200P reflector puts the focal plane at a reasonable position, however if 300mm it is too far if you had to observe near the zenith. So for a 300mm reflector you very likely have to conside a scope no slower then f/5 - otherwise you cannot look through it at times. I will say be a little wary of f number, it is bounced around as if it is the most imortant part of a scope, it's not. Have been to exhibitions where I was told several times the f number, when I asked a bit more the guy knew the diameter and the f number and just about nothing else. It does however sound good.
  16. 2 points
    Hanging out in the desert last night with the club. Due to significant errors on my GM-8 worm gear, have been inclined to tackle some widefield with the Cannon 200mm f2.8 on my stock 60D, and some even wider shots with the 18-55mm zoom lens. Seeing wasn't superb, but it was dry and cool all night. Here's a pic of the clubs public pads: As the Sun set, it looked like it was going to be a great night: The first time I used this lens (200mm f2.8) I stopped it down to f/4, but with your guys's advice I left it wide open. I never really got a perfect focus, but I'm new to this and was happy with the results. Spent a coupke hours helping out some other member with their gear, then around 1:00am targeted M8 and M20. I really had no idea what setting would be best but tried 60 seconds, 1250 iso. This was roughly 20 minutes total. DSS then CS5: I'm really not sure where I am here, but was trying to find IC1396, 24 X 120 sec, 1600 iso: And of course before Sunrise, had to get some Milky Way shots. This was with the standard 18-55mm lens, at 18mm. 3 panel, each 200 sec 800 iso: So all and all happy with the camera and lens performance, especially for starting off. Modding is out of the question so stuck with what I got. But with some work on proper data capture, tracking, and processing, I think I could really get into widefield dslr imaging.
  17. 2 points
    Some clear skies last night and thought I'd give galaxies a rest and go for the Crescent Nebula in Cygnus in NB. In fact just Ha and OIII as I couldn't find any SII. the overnight run yielded :- Ha 15x1m + 54x2m and OIII 18x1m + 67x2m but it looks like cloud came over around 2am as after that the subs were useless. MN190 with Atik 314L+ mono, guiding with Lodestar on OAG and PHD. Stacked in DSS, combined and processed in PS. Colour mapped as follows :- Ha to Red, OIII to Green and 25%Ha + OIII to Blue. This is the result of just 21 Ha and 12 OIII 2m subs (later I may try adding in the 1m subs since the 2m ones resulted in so few) :-
  18. 2 points
    When I first saw Jupiter with my own eyes, I had goosebumps. Even though I know how far away it is, even though I know it's rather huge, and even though people have pointed the bright "star" in the sky as Jupiter I was blown away. I remember when I was a 10 or 13 hiking through the woods on a field trip - we hiked 2 miles on a special trail with different markers. Marker 1 was the Sun, marker 2 was Mercury...all they way to Pluto 2 miles later. Of course as a kid I was more into the girls than anything, but I remember specifically running through and collecting the Mercury, Venus, Earth and Mars pebbles and then saying "Are we lost?" because the distance between Mars and Jupiter seemed so much further. When we came up to a boulder, our teacher said "Ok, and now who wants to carry the boulder". I remember looking at the pebbles in my hand and getting goosebumps then too. 15 years later I finally have my first telescope...and I'm super excited to sign up here. Hi!
  19. 2 points
    ~180 mins total mainly in 10min subs but also ~60 mins of 1, 3 and 5min subs taken while testing my OAG. Stacked in DSS then PS Lost my way a bit with the processing as the core is over done. Will need another go before I add the Ha RGB I have yet to process.
  20. 2 points
    Hi, Swapped scopes from a C11Edge to a Skywatcher 8" Quattro and a subsequent reduction in exposure time to capture the following image. This is 24 subs at 210 seconds, 800 ISO on a Canon 600D. I used 5 flats, 5 bias and 7 darks. I have some more subs of just M81, and M81 & M82, so might try to add these as a montage, to see if it will pull out a little more detail. Robin
  21. 2 points
    Yesterday I spent a while working through my references and planning a 'running order' for getting to and through Markarian's Chain. It took me a while bringing together my observing guide (Objects in the Havens), Pocket Sky Atlas, SkySafari+ and notes from other reports on here, but I didn't think doing it on the fly would work very well... It was a pretty miserable day here so I didn't hold much hope - especially when it hailed late afternoon - but it did clear and suddenly it was a nice clear, crisp looking night. I'd previously been dethused with galaxy hunting from my garden but discussion on one of Michael's threads encouraged me to get out there. 2300-0200. Miserable rainy day but now it's cleared to a really clean and clear sky, approx NELM 5.3. Starting from rho Virginis my first stop is just next door, so in with the 12mm for x100 and off we go Having struggled with some 9-point-something galaxies previously I was sceptical about 4596 at mag 10.4, but it is immediately apparent albeit faint. Some gradient to the core is visible, and an oval shape can be seen. I was more sceptical about a mag 11.1 galaxy, especially being only 10’ from mag 4.9 rho, but 4608 was surprisingly easy too. Encouraged by these early successes I started going off piste. 4660 wasn't on my list but PSA showed it being on the way to M60 so I had a look, and found something. "Pretty sure this is non-stellar, in the right place, v. compact?" Looking it up now I find it's a mag 11.2 EG of 2.1' x 1.7', whereas the others were 4' and 3', so I'm happy with that Next M60 was easy being brighter, although notably more diffuse (8' x 6'). There are hints of wider haze around the brighter core area too. I spotted 4638 next, but ignored it while I tried for 4647. This is the faintest yet at mag 11.6 and only 2.5' from M60 (with which it is interacting). I wrote "Oooh, hard to catch. If it's diffuse I saw it. V. faint, v. thin and not that small, but no obvious core." SkySafari+ states "has a 2 arc minutes diameter halo with a weakly concentrated core" - tick 4638 aka 4667 was a surprisingly obvious mag 11.2, having spotted it already as noted above. While looking at it I already see M59 awaiting, completing a nice triangle with M60 and 4638. I tried the 8mm on M59 for x150, and was surprised that there is a difference in terms of how much shape is visible - I expected it to just be bigger and fainter. However I'm sticking to the 12mm as my workhorse, and decided that I don't have energy or time to investigate each object in detail by switching eps if I want to make it to Markarian's Chain - so tonight will be a bagging night not an observing-the-finer-details night! M58 is obvious, and larger than many have been. Heading off an a brief tangent now: 4564 is a fairly obvious mag 11.2, on the way towards the Siamese Twins. The clouds rolled across here, and I feared it was all over, but I managed to keep a nearby bright star in the eyepiece through the clouds and 15 minutes later I was back in business! Try as I might I still couldn't separate those Siamese Twins though. I can see one very very faint cloud here, "just barely", and no clear core. I think I'll claim the brighter of the pair, 4568, but I certainly couldn't distinguish a separate 4567. Back up to M58 to continue along, to M89. This isn't an easy starhop with the 12mm (36' fov) but easy to spot once there. Off piste again, PSA shows 4550 nearby. I found two faint fuzzes here stacked vertically, close but not too close and similar magnitudes, very definitely two separate galaxies. These made a nice view together, and nicer still with M89 in the fov too I've looked this up and they are mag 11.7 4550 and mag 12 4551, 3' apart supposedly although it looked more than that to me. M90 is another brief tangent from the main route, fairly easily found although fainter than expected for a mag 9.4 - I wrote "faint, large??" but while it is wider than most at 9' x 4' OITH describes it as "well formed oval; bright core" so that seems odd. Back to M89, I then got lost hopping to M87, but stumbled across something when I resorted to the 30mm ep and then determined it was, infact, M87! This was reasonably bright (mag 8.8), although I noted "not a strong core even at x150". Nearby 4478 didn't stand up to x150 but was better back at x100. This is fairly compact at 1.5'. Now, finally, to hop across to M86 and Markarian's Chain Not the easiest star hop due to a lack of features (and not bothering to change to a wider ep...) but I drifted past the Eyes and then got M86 and M84 lined up in the fov. The background is lightening as Virgo drifts lower to the West, but it doesn't seem to be stopping me from picking the fainter galaxies out (although the view isn't so pleasing). M86/M84 are both pretty bright, with diffuse hazes around their brighter respective cores. 4388 completes a triangle with these two, faint but discernable. It's mag 11.3 but at 5.6' x 1.5' it's no gimme. Right in the middle of that triangle is 4387, small and barely visible at mag 12.1 - the faintest of the night. This needs the sort of averted vision where you creep up on it without it knowing you're trying to look... Once all four are found, that triangle of M86/M84/4388/4387 is a really pleasing view in one fov Near to this triangle should be 4425 (11.8) and 4413 (12.3), but I can't spot either. Next along the chain is the Eyes: 4435 and 4438. These are fainter than I expected at mags 10 and 10.8. 4461 (aka 4443) is even fainter, although it should be at mag 11.2, and I can't see 4458 at all (mag 12.1). 4473 and then 4477 are next down the line, both nice and bright, at 10.2 and 10.4. 4459 is easy to find next to a star, and makes for a nice view. 4474 is faint, at 11.5, but I got there eventually! The sky is getting quite grey over here now... 4468 should be next door, but this is another off-piste one and there's no sign; at mag 12.8 it wasn't very likely. Lastly, M88 to finish things off, brighter and a nice easy one to end on. I scanned up and down the chain a few times while working out what was what, it's a nice little pathway of stepping stones to meander along, and easy to navigate. Really pleasing The rest of the sky was very black and crisp, so I had a quick go at M51/5195, where the two cores were obvious but no detail was forthcoming. Next I hit M13 for the first time in this scope - wow! I would say this is easily better than M5, it's so big and so deep, absolutely amazing! I also spotted the nearby galaxy 6207, but went back to M13 pretty soon! I could feel my eyes giving up as I tried to see the details though, and since it was just past 2am I called it a night here. It took a lot of planning yesterday to be able to do this session - and a lot more sorting through today to make sense of it all - but it was really worth it. 3 hours, 29 new galaxies, 2 revisits and one new-to-this-scope: I'm absolutely chuffed with that The 5 failed-to-finds are less than I expected too! Sorry this has been so long - I'm not used to having so much to report! - and thanks for reading. Happy Hunting
  22. 2 points
    Hi gavin, floaters are not too bad for me at 1mm E.P and above. This is one of those areas where people have there own preferences and will depend on what they feel happy with but about 0.5mm is about the minimum. This might be a good excuse for you to get a bigger scope
  23. 2 points
    Well I've put my 200p/EQ5 plus camera & bits n bobs up for sale now & i'm going for the 12" Revelation, i've been reading the reviews & the poor coating problem seems to be only with older ones so hopefully this has been rectified (I've read it has?) I'm also decided on the 30mm ES (although that'll probably change in the next 3wks till pay day knowing me ) as the Rev is f5 & i dont really have any lp where i live (the orange glow mentioned shouldnt be a problem) hopefully i'll be ok, anyone think otherwise i'll happily listen.
  24. 2 points
    It's hard to be content with what you've got, or can afford , I have a 10" SCT that I'd like to replace with a 10" RC and 10 Micron mount and a 100mm refractor that I'd like to replace with a nice trip apo and another mount and an Atik 314L+ that I would like to complement with larger chip camera. I'd also like to move house to darker skies. Failing winning the lottery (unlikely as I don't do it) I'll just have to carry on saving up. The conclusion is that I've only scratched the surface of the capability of the stuff I have at the moment and there will always be bigger, better stuff out there, so just dive in and buy something, anything, it will give you hours of pleasure, and you can always sell it and move on. Dave
  25. 2 points
    My biggest gripe with goto is that it's not portable enough for me. If it was I would have it. From a dark site its great fun finding things . But from a city site it's not nearly so easy. Star hopping is much harder when some of the intermediary steps are drowned out by city light pollution
  26. 2 points
    i have both Meades 82 deg 24mm and the 30mm "bomb" and depending on situation i use both of them. Yes there is a tiny bit of coma but that does not bother me at the slightest.Views are absolutely excellent in either of them.Its the share size of the 30mm Ep what makes me smile every time i open my EP box.I recently had a friend of mine with his son joining for observation session and they where both speechless when we where observing star clusters through the 24 and 30mm.(it was they first time).It is a tough call to decide which Ep i like better 24 or 30,they both have they "edge" for me. Either way,both Ep`s will perform great in 8 and in 10" Dobs and even in 14 or 16",and they will not be "dodgy" ( and i mean Meade and ES) all down to what you like design wise as Meade have they own approach to the Eye cups and ES is more or less the standard fold down one.Optically they are identical. If on a budget and your biggest scope is planned to be 10",i would say go for the 24mm.If you are planning to upgrade the scope in the future,i would think for 30mm.(i will be upgrading closer to autumn to 14 or 16" dob)
  27. 2 points
    having another think about my new purchase and i think the tv 22mnagler sounds good, the 24mm pan sounds good as well but as john says i have covered the fov with my other e.p.s and if i barlow it then its a 12mm which i have with my bgo, so the 22mm fits nicely in my range and if i barlow it i have a 11mm which i havnt got. so has anyone got a free 22mm nagler for me obviously i will cover the p+p. thanks to everyone
  28. 2 points
    just remind me to never buy anything of you lol
  29. 2 points
    My astro pot is now funded by the money I no longer spend on cigs. She's happy, Im healthy(ish) On a side note... whilst at a camping site the other week, one of those hydrolic bollards came up just as we were walking by. As I was giving it a firm "tap" with the palm of my hand, a resounding "NO" came from behind me. She can read my mind
  30. 2 points
    http://www.12dstring.me.uk/fov.htm
  31. 2 points
    I spent many years with nothing more than a pair of binos, so needed to learn the sky and would be quite able to find my way around if I had to. Having said that, all my telescopes have had goto - I want to spend the time looking AT, not FOR a 13th mag faint blob. If "Goto=cheating" then maybe having motors to keep an object in the fov is also cheating, or having a decent mount (just hold the scope in your hands) or indeed using any optical aid (binos/telescope)? Goto is just a tool to make life easier.
  32. 2 points
    All depends on whether you happy taking the same old BIG nebula targets as everyone else year in year out. If you going for BIG targets you'd be better getting something bigger that the 460 as its not a BIG a step up from the 314 you might think.. Here is the popular IC1396 nebula through a 500mm focal length telescope using ATIK 314,460 & 383 now the 383 IS a big improvement on field of view..
  33. 2 points
    Details on Astrobin, but basically it is 17 hours of Ha (subs ranging from 1800 seconds to 8200 seconds, but mostly 3600secs), 8 hours of Oiii in 1800 secs, and just four hours of Sii in 1800 sec chunks. Due to the unrewarding results from the S2 filters, these days I merge the Ha data with the S2 by about 30%, as the bright parts of the Sii match the Ha to some extent the results are reasonably accurate and save having to use half your life gathering Sii data Cheers
  34. 2 points
    Getting this as a kid started it all for me Fond memories of 'using' it.
  35. 2 points
    I blame this guy and I was 61 years young
  36. 1 point
    Another image taken on the 5th, processed using the best of two avis combined in pipp -1800 frames stacked in AS!2! Thanks for looking.
  37. 1 point
    Hi. Well, it's taken a while but I'm just about up and running now! I've been casually interested in astronomy for ages now, ever since dad showed me a fuzzy Saturn through his spotting scope in the back garden 30 years ago. Well I'm delighted to say that on it's maiden flight my new Skywatcher 200P bagged me 6 moons on the same night! I've often heard that folks can be disappointed when they first peer down a Newtonian for the first time - nothing could have been further from the truth for me - to get cracking views of the Moon, Jupiter with Callisto, Io, Europa and Ganymede as well as Saturn (including my first glimpse of the Cassini division) and Titan, I was blown away! I'm thinking of sticking with planetary observation for the first few nights - just so I can get used to my new kit. DSOs can wait for a while as there's soooooooo much to learn! I've learned a lot from looking through discussion forums here, so I thought it was about time I joined in the fun!
  38. 1 point
  39. 1 point
    Based on Johns on site report on the Hutech range how can the BGOs still be changing hands at silly prices. I bought a 9mm the other month for over the odds but it was not that badly priced at 80 pounds. I would wait for the Hutechs to come in again with FLO, I bought the 12.5mm from them but believe it was the last one for the moment. I also went for the 18mm Kasai which by all accounts is not second best. How anyone can now advertise these at inflated prices and expect people to pay when clearly the same is on offer for 89 pounds is beyond me. I can also understand people wanting a set of them just to keep the eyepiece case looking pretty. I would wait and buy new from an outlet we all trust! Alan.
  40. 1 point
    It's a 44% increase in aperture, blame Pythagoras or someone, it goes by area not diameter. The additional aperture should be useful especially on a well produced objective, what you "lose" is a little on the protability. 102mm is bigger, heavier and longer then an 85mm. Running off into the night with an 85mm under your arm to howl at the moon is easy, to run off with a 102mm under your arm means you could be out of breath and need to recover before howling at the moon commences. Would you see more, well a little. Always find this difficult. M42, M31 would be better, as would the planets - Jupiter, Saturn maybe Mars. Left the moon out as that is bright enough that you would need a filter for it. The bunch of galaxies in the Virgo cluster then not much - they are all small and all distant, they remain small and distant. Something that is half the size of a pinhead in the 85 is not going to swamp you with feeling of awe in the 102mm (still going to be half a pinhead). What will most likely happen is that you see a few extra things that are a quarter the size of a pin head that the 85mm didn't quite present to you. So more numerically but not sure that is what people realise. Of the 2 then the 102mm would be the weapon of choice, above 102mm you would need to be sure of the optics, they start getting to that size where aberrations need cancelling out more, especially on the modern faster scopes. Assumption is that both are ED doublets, sort of mid range lens type as not achro and not apo triplet.
  41. 1 point
  42. 1 point
    Hmm you say your wife doodled it??? I'de beware OBS might mean "other boots and shoes"
  43. 1 point
    Batteries low. Change them or charge them.
  44. 1 point
    Will it open a whole can of worms if I say that I am the 'wife' here? & that it's not gender-specific - he can roll his eyes and tut with the best of them if I so much as suggest a new ep Heaven forbid that I should want to go out for a night's observing if it's one of his pub nights...
  45. 1 point
    I don't what I am doing wrong. My wife talked me into buying an observatory, a 12" Newtonian and a caravan for Star Parties. Do you think she doesn't want me in the house? Nigel
  46. 1 point
    I've used Photoshop a long time ago, I think I'll stick with Gimp for the time being (the 16bit support will be in 3.0).
  47. 1 point
    I've been interested for pretty much all my life, but got my first scope about 3 years ago, at the age of 12. I've been hooked ever since.
  48. 1 point
    Thanks so much Steve, Gina, Rob, and Freddie. Actually, I've been back to Steve's book (always something more to take from it) and re-done the colour. I was a bit stricter with the subs I used - lowering to 22 for the RGB. I also used a different stacking routine. Not sure what's helped, but I seem to have managed to preserve a bit more of the star colour in this version...
  49. 1 point

    From the album: Solar Images

    H-alpha image taken through Lunt LS35THa, using ASI130MM. Stacked + wavelets with Registax, background subtraction in ImageJ, colour curves and sharpening in Gimp.
  50. 1 point
    Two moon images from 2009. This image represents my first attempt at a colour saturation moon. This is 32 stacked frames, for improved colour detail. Jan 2009. I took this full moon shot at 26 minutes into my 21st birthday, through a 6" f/8 Skywatcher Evostar. I'd just been out for a few drinks so I was quite chuffed with the result! Andrew
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