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Found 13 results

  1. I thought i'd revisit this one, as i was never truly sure abut the processing originally. So with this one, i sought to improve the stars (they're a big improvement) but also bring out more of the dark nebulosity. Did i go too far though?! Looking at it again today i think i may have. Details: Ha: 7 x 480s, 6 x 1200, 13 x 1200 (a little over 7 Hrs) OIII: 9 x 1200s (3 Hrs) RGB (with IDAS-D1 filter): 20 x 60s The usual Flats & Bias, stacked in APP and processed in PS. Gear used: Nikon D5300 (modded); SW 80ED (522mm FL); HEQ5-Pro; SGPro and PHD2. The original version can be seen on the Astrobin link. C&C welcome and clear skies folks! ps - At the moment this is still at 100%, but i'll probably end up down-sampling it to about 50%. I don't think it can hold up to 100% tbh. Edit - Here's the new, now much more toned-down, version. It's a clear improvement, so i'll have to keep reminding myself not to try and go for big & bright, when subdued nearly always ends up looking better! Original, nasty over-bright version: https://astrob.in/346428/C/
  2. Heres my version of NGC 7000 and the Pelican nebula, taken back in 2015, through my William optics zenithstar 70ED with focal reducer. To fit it all in I did a 4 pane mosaic. Think the subs where 15 x 6 mins for each pane..........hope you like.
  3. Hey guys Here's a quick couple of WIP projects i have on the go. The NAN and NGC 7822. Just Ha for now, still need to capture the OIII. The NAN one is a bit of a long-running saga for me. I first tried to image it on my 2nd light of the newly-modded D5300 and Ha filter back in early October. Got a small number of cloud-affected subs before the clouds rolled in for good. Then tried again in mid November and the same thing happened again. It's been obscured for me since, due to the neighbour's house, but it's now visible again (just) although it's very low on the horizon and i need to stay up Very late to get it, so i tried yet again in late March and did get a decent amount of subs this time, although i've now realised that imaging at super low altitudes is not something i plan on ever doing again, as the guiding is not great and image quality is nowhere near as good as at higher altitudes. Things did improve once it got over 20 degrees, but it still wasn't brilliant tbh. As for NGC 7822, i captured this one just last night, April 5, between midnight and 3 am. Was in bed for 4:30 then up again for work at 7:15, so, err, today was fun, lol. When i realised it was going to be clear i frantically went on to DSO-Browser to try and find an Ha-friendly target, as there aren't many about these days, and the moon was coming up shortly after 01:00, so i was glad i discovered this one in the end. Hopefully it has enough OIII to make a good Bi-Colour image. I have until the end of the month to try and get it, fingers crossed. NAN: a little over 7 hrs in total. 7 x 480s, 6 x 1200, 13 x 1200. Stacked them all in APP using the 'Quality' setting. NGC 7822: 3 hrs in total. 9 x 1200s. Also stacked in APP using the 'Quality' setting. No real processing done on either, aside from a stretch and gradient reduction (for NGC 7822). I'll update the thread if i manage to get the OIII for either in time.
  4. I've spent the day at the keyboard documenting some image processing techniques and as the skies have been so poor, I've had to use some old data for the screen shots but this one worked out OK with the new work-flow. A Wall of Ionization NGC 7000, the North America Nebula, is a very popular deep sky imaging object and its rich Ha emission content makes it particularly appealing for RGB imaging. However, I like to capture this region of the Milky Way in Cygnus using narrowband filters to really bring out the detail in ‘The Wall’. As well as the predominant Hydrogen Alpha (Ha), this object is also quite rich in doubly ionised Oxygen (OIII) emissions. The position of OIII emissions in the light spectrum, right on the cusp between green and blue, allows a full RGB colour image to be produced from just two sets of filter data by using the OIII data for both the green and blue channels and the Ha data for the red channel. Image Stats Mount: Mesu 200 Telescope: William optics FLT98 Reducer: William Optics FR IV Camera: QSI 683 WSG-8 Filters: Baader 8nm Ha and 8.5mm OIII Subframes: 19 x 900 sec OIII, 19 x 600 sec Ha Control: CCD Commander Capture: MaxIM DL Post-Processing: MaxIM DL and PS3
  5. I am currently entertaining myself with data from the monochrome (red or blue filter) glass plate images from the Palomar Observatory Sky Survey II (1990ties) by adding RGB data from my own images. I download the data from the Mikulski Archives site (I am sure many of you know about it but I only discovered it yesterday). They used the Oschin 48-inch (1.2-m) Schmidt camera on the Mt Palomar Obsy and I used my humble 5" ES apo refractor and Canon 60Da. Here is the download (red filter image) from the Mikulski Archives site and the final colourised version made in PS. I added the glass plate data to my RGB in PS using both Soft Light and Luminosity mixing, and then stretched, improved contrast, and worked on the colours. Much of the job went into the initial the scaling, rotating and aligning (manually in PS). Comments and suggestions most welcome.
  6. I've been (im)patiently awaiting the darker winter nights returning so I could see what my new equipment could achieve in terms of astrophotography. Last weekend saw a clear night where I could take a short trip to a dark location and image a few objects. Below are a few of the images obtained. All were taken with a Canon 650D DSLR on a SW 80ED refractor. Due to this being my first real chance in really dark skies to try out the kit I wanted to image several objects to assess the capabilities rather than concentrate on getting lots of subs on just one target object. The end results are from a stack of about a handful of unguided exposures, each of 2 minutes or less. I'm quite pleased with what could be achieved in such a short period of time with these brighter winter favourites - they are certainly miles better than I've ever managed before with previously owned more modest equipment. Hope you like them too
  7. Cygnus Wall (part of NA nebula), imaged on October 3rd and 4th 30 x 8 min unguided @ ISO 800 with unmodified Pentax K20D Skywatcher 150PDS on AZ-EQ6 GT Processed in PixInsight. Comments welcome
  8. Another late night with true darkness happening about 11:30pm and the Milky Way shone brightly. The view of "our" object can be simply amazing and I saw a new projection (to me) or "arm" up into Cepheus just before the Cygnus rift- Cepheus in this area was strewn with stars and "nebulosity" naked eye. Opposite the Cepheus arm there was another shorter projection of the Milky Way and they both were very sharply defined. The Milky Way being so bright might explain something that I see and puzzles me... I see an underlying "texture" to the sky in most places and in particular right in the MW- I'm leading into how the objects listed looked tonight to put things in context. The wide field of the SW120ED/42mm LVW only enhances this phenomena and also allows me to see... IC5068 Scarp15, who also has an interest in neb hunting asked about a few nebs he is seeking, so first off I wanted to try IC 5068 near the Pelican in the NGC7000 area. I have studied this area quite a bit and have seen IC 5068 before, but the thing is that the whole area is surrounded with that underlying "texture" blending into more visible nebula- and lots of them, IC 5068 being one. The SW120ED gave a fantastic view of the Pelican, showing its head and a few detached nebs around it, the NAN was "bright", surrounded in places by dark strips of sky. So, once that extra wide view panned the NAN, a dark lane on the back of the neb was noticed- opposite side of the Gulf and Pelican and just past this a huge liquid shadow came into view...I followed it up down and sideways, at first I thought it is an extension of the NAN but I don't think so. I'm trying to find this oblongish patch on the maps and in images- so far only the rift really shows. However the nebula is distinct and separate from NGC7000, this was my prize of the evening! I had seen hints of it in the dobs but the FOV was too small. IC1318 Another favorite and a goto object of mine. It showed well in the frac, both with the UHC and the Hb with a totally different perspective than in the dobs, the VX10 shows this one best perhaps but that wide FOV is riveting. In dark skies this object is not hard, harder than the NAN though. My suggestions to anyone who wants to maximize their views of IC 5068 and area would be: use a low exit pupil 5mm-6mm+, make sure your FOV is big enough-2" widefields shine for a lot of this stuff and finally- try the "big 3" filters (UHC,Hb,OIII), it's amazing the different presentations they offer in this area- and what pops into view with each one. Actually this is what I do and use on most nebula and this enables even modest aperture scopes like the SW120ED to give some fantastic views, from dark skies. Gerry
  9. I managed to have a short session in clearer skies than a couple of days ago, with a view to second attempts at some of the objects that were previously obscured by clouds. I started just before 10pm but twenty minutes of staring at the sky around NGC 7000 (the North American nebula) with and without filters produced nothing. Luckily, the Andromeda galaxy NGC 404 (the Ghost of Mirach) was visible. Not easy but with averted vision, a small circular extension to the haze of Beta Andromedae (Mirach) best seen in my 15mm eyepiece. Additionally, this is one of the easiest objects to find in the entire night sky. Even more difficult was NGC 891 (Caldwell 23), another galaxy further East in Andromeda. It is a side on galaxy but observations only revealed the feintest of small smudges with no shape discernable. I will revisit the two galaxies when they are higher in the sky, hopefully on a really transparent night. I may just be able to tease a little more out. I finished off with my most Northerly DSO find, NGC 188 (Caldwell 1) in Cepheus. Although quite easy to find, I found the open cluster a little underwhelming. I managed to count a handful of feint stars and got a hint of milky haze just to one side of a kite-shape asterism of brighter stars that surrounds the cluster. A clearer night and bigger telescope would go a long way with these three but I am happy I found them. __________________________________________________ ______ Observing Session: Thursday 13th September 2012, 21:55 hrs to 23:20hrs BST VLM at Zenith: 4.9 - 5.0 New - Revisited - Failed
  10. Hello! I'm from Hungary. This is my first post. I am glad to be here. Recently I'm trying to sketch some deep-sky objects. I've made this observation yesterday. Cygnus was near to the zenith and the sky was pretty dark. NGC 7000 is one of my favourite target. I like to observe it with any telescopes, especially with RFTs and with UHC filter. Please excuse my language errors. Gyuri
  11. Hey-ho So then, just as i thought the DSO season was well and truly over for me until late August/early September, as it turned out last Saturday night (May 5th) was mostly clear, so i set about trying to finish the NAN image i had captured in Ha a while back (see thread below): So all i needed was some OIII. It's obviously not the ideal time of year to capture this i know, as it's so low on the horizon, but beggar's can't be choosers so i tried my best to make the most of the small amount of astro dark time available and just make the best of it. In the end i managed 9 subs, two of which were sub-standard due to passing clouds, but as is my want these days i still asked APP to stack them (using the Quality setting) and it didn't seem to affect things. So in total this is: Ha: 7 x 480s, 6 x 1200, 13 x 1200 (a little over 7 Hrs) OIII: 9 x 1200s (3 Hrs) RGB (with IDAS-D1 filter): 20 x 60s The usual Flats & Bias, stacked in APP and processed in PS. Gear used: Nikon D5300 (modded); SW 80ED (510mm FL); HEQ5-Pro; SGPro and PHD2. The RGB subs were used solely for the stars. I still need to get better at merging them with the NB channels, i'm not as good as i'd like to be at controlling them. Although in this instance, i did mask the stretching of them, and it definitely helped, but i need to practice this to get better at it. I think the fact that the RGB stack (even at just 20 mins) contained some nebulosity didn't help things. When it's just stars and nothing else, it's so much simpler to combine them. So this is just a Version 1 for now (i'll try an sSHO next). I used Ha for Red, OIII for Blue, and used one of Carboni's Actions to synthesize the Green channel. Then went round and round in circles trying to find a colour balance to my liking (on my rubbish monitor!) so i'd love to hear what you guys think. Too dark? Too much saturation? (i tend to do that, lol). I also couldn't decide on orientation, so have included two different ones. Which do you guys prefer? All C&C welcome. Don't hold back! I'm always looking for ways to improve. Clear skies!
  12. Hi all, Finally got everything almost working right! Off-axis guider cuts off right of frame a bit but oh well. ED80 on iOptron CEM25 14 x 5 min guided. Then the fog came in Was fighting dew all night but rigged up a dew strap that did pretty well! Comments, criticism and feedback always appreciated. Cheers.
  13. Despite some clouds yesterday night, I managed to get a few hours staring at the Cygnus Wall. This is very much a WIP (am shooting more subs right now, less cloud) So far, 17 of 31 frames stacked (only about 6 - 7 rejected due to poor tracking, the rest due to low contrast = clouds) 17 x 480 sec subs (unguided) + calibration frames @ ISO 800 (total time on target: 2 h 16 min) scope: SW 150P on AZ-EQ6 GT camera: Pentax K20D (not astro modified) software: PixInsight (stacking, cropping, colour calibration, noise reduction, stretching and slight sharpening). I may restack these with the low contrast frames to see if I can get the noise down. At which time I will also make an effort to reduce the stars and sharpen the nebula. Comments welcome.
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