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Davesellars

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About Davesellars

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  1. Have I got an Eyepiece Obsession going on?

    I have two cases that are used - 1 for the dob and 120ED and the other for the refractors on alt/az that lighter eyepieces makes life so much easier. The dob case has a Panoptic 24mm, Delos 17.3, 14, 10 and 6mm and also a Pentax 7mm. I find all these focal lengths necessary for critical DSO observing. The other case has a 32mm Baader Classic Plossl, 24mm ES68, 19mm Panoptic, 11mm ES82, 6.7mm ES82, 10mm BCO and a 4mm TMB2 clone. I think this case will certainly see some changes perhaps the 24mm ES will go and perhaps reduce to just 3 or 4 eyepieces. Perhaps I should sell the lot and get a premium zoom? I also have a 28mm ES Maxvision that as excellent as it is does not get much use and a 6mm BCO that gets used only for solar white light viewing. and a set of Skywatcher SWA-70s... which I should get around to selling! and a random selection of Plossls that apart from a couple of Celestron Omnis don't have any value. They are used for my four year old daughter with a four inch SW mini dob.
  2. The area of eye lens doesn't have anything really to do with the diameter of the eyepiece (1.25" or 2"). But , the focal length of the eyepiece and also the eyepiece apparent field in degrees. You will however need a 2" diagonal and eyepiece to reach the widest possible field of view without vignetting starting to be apparent in the C8. The Baader Hyperion Aspheric 36mm works very well at f/10. I had this one with my C8 but it got very little use after I put a focal reducer on the C8 - This is another option and means you can use more sensible focal lengths and lighter to boot. With a focal reducer for example you'd stick with a 1.25" diagonal and your max without vignetting would be around 24mm at around 68 degrees AFOV (and also the max for a 1.25" diameter). Long focal length eyepieces with wide view are considerably more expensive so the cost of a focal reducer would be offset by less expensive eyepieces anyway. Given that there's no planets to view at the moment... I'd budget eyepieces for DSO visual work first and then when Jupiter starts to come around again purchase one for planetary use. Around 11mm would be perfect at f/10 or 7mm with the focal reducer giving 185x which is usable the majority of the time. If your still using the stock diagonal that came with the C8 I'd change this first... Obviously what you choose here will depend on if you got the f/10 route with 2" diagonal being required or with a focal reducer and 1.25" diagonal. A good diagonal will be an improvement over the stock one.
  3. Telescope took a fall

    Agreed. No way I'd be happy with it being up to up to me to test it. Get it replaced.
  4. Which 'middle' EP ?

    I wouldn't recommend the 8.8mm ES82 for that scope at the moment. You would use it rarely. The ES82s are great eyepieces for DSOs but imho the lower focal lengths are terrible on bright objects like the Moon. I'd say the 14mm ES82 would be the best progression from the 24mm to give you a mid-high power at 145x which would be great for globular clusters and planetary nebulae. For lunar and planetary observation I'd go for an orthoscopic around 10 or 11mm since you have tracking the lower eyepiece AFOV is not a problem
  5. Which eyepiece do you REALLY use most?

    I would say used the most as being my 24mm purely because it's my "finder" eyepiece for all my scopes. This was previously the 24mm ES68 of which has been kind of replaced by the 24mm TV Panoptic which certainly results in better performance for DSOs imho. From there it's either the 17.3, 14 or 10mm Delos depending on the object and transparency.
  6. Another "which eyepiece next" thread

    For £65 that's a seriously good price for the 24mm ES68. It's a great EP!
  7. Florence and the fuzzy from another Galaxy

    Great report Neil! Some nice objects there and nice observation notes - well written! NGC604 would appear as a dim patch rather than stellar appearance. With the 12" it appeared quite bright indeed (I would say as bright as the core of M33 itself) and of reasonable size. Try it again on a completely dark night and hopefully good transparency.
  8. Nagler vs Delite

    I think a 7mm would be more useful giving almost 130x and still reasonable exit pupil. The Pentax XW is a really nice eyepiece and gives you more view than the Delite for the same price. I've never tried a Delite but the Delos are very good. Perhaps see if you can pick up a second hand 6mm Delos which i found was awesome on Jupiter.
  9. Another "which eyepiece next" thread

    I have the Maxvision 28mm. It's an excellent EP especially at this price. It shows coma quite noticeable at f/4.92 the last 1/3rd of the view but I guess this is quite expected at this focal length anyway. Personally for galaxies I wouldn't want to go much higher than 24mm though unless you have low LP. For budget the 24mm Maxvision is also available saving you money on buying a 2" filter.
  10. WOW ar2674 stunning today 31-8-17 "updated"

    Nice images! Yep, I took a look at this one at lunchtime with a white light filter. It's pretty impressive! Quite a bit of activity at the moment.
  11. Italy - night three

    Great report Piero! Some classic objects observed. Don't you have a similar dob or something for use in Cambridge? M13 I really love to observe at high power. If you get a night with good seeing and transparency and dark... it's truly spectacular at 200 to 250x really getting in to the core.
  12. Stephan's Quintet

    It certainly needs excellent transparency this group. I'm not sure if I'll get to see it any better than I observed it the other night with my 12". I was able to just get a hint of it with my 8 SCT last year, The 12" dob makes a large difference. While I liked my SCT the lack of contrast at times made it more difficult to pull out really faint DSOs and needing higher power to compensate so perhaps this could have been a large factor not seeing the group well since there if the transparency factor meant not supporting higher power to be used.
  13. Better still .....

    Nice one John! Good to see you're out enjoying the clear skies. It's not too bad here now but the transparency looked rubbish earlier with plenty of high cloud and milkiness... I'm knacked anyway after last night.
  14. Well, it's been a busy and chaotic week starting with the arrival of our 3rd daughter and so it was nice to see a clear night to end the week on just to relax a bit. So on Sunday night (Monday morning) after getting the kids to bed etc it was about midnight by the time I started the first observation after lugging myself to my site and setting up. Of course a night with no Moon and clear deserves to use the big guns so to speak so the 12" dob was used. I started out checking the collimation, by some miracle it was still bang on and didn't need changing (that's a first...). I didn't have a big plan for the night's objects but I wanted to get round a few galaxies in Pegasus and just have a fairly chilled out session visiting some known targets... It looked good. Nice and bright stars and plenty of 'em... Double cluster naked eye and the Milky Way easily visible and later would show some really nice structure one my eyes had properly dark adapted. First a bit of a whistle-stop tour of some nice easy objects that I could just point and shoot to: M13 and NGC 6207 which showed nice and bright so a reasonable tick there for transparency. Double Cluster and then quickly on to M31, M32 showing really quite bright this time with the care and a reasonable amount extra to the core. M110 showed brighter than I can remember it before. While it's summer I'm checking out the Veil nebula at every opportunity. This time I used the 17.3mm Delos with the Astronomik OIII filter. The extra contrast given by the focal length over the 24mm Panoptic used the previous time was a real winner. OK, I sacrificed a bit of FOV but the clarity of the nebula was staggering. Only the central area was more difficult I felt with not having the wider view but the Eastern and Western sections were amazing and full of detail with little wisps and tendrils everywhere. Right. time for a challenge... M33 - The position is easy enough to find and so many times I have failed with M33 it's such an irksome object to see with being so darn large and diffuse... Certainly the best view I've had was one spectuclarly transparent night was with my 120ST. This is not an easy object with such low FOV. The core at least was immediately visible with the 24mm Panoptic and some very diffuse patches around it. Moving to the 17.3mm Delos things got a touch easier with the core quite distinct and more interestingly the nebulous patch NGC 604 was very clear and bright. With the ES Hbeta it seemed almost like there was a proper shape to the galaxy with further patches of light perhaps illuminating or showing the arms better NGC 604 was certainly quite larger as well as I think the nebulous patch NGC 595. After that I thought I'd step up the challenge a notch further and go for perhaps one of the toughest objects (IMHO) on the Herschel 400: NGC 6946 - The Fireworks galaxy. Man, even with the extra aperture this is one tough nut to crack Very easy at least to see the position of the galaxy - This shows as only very diffuse patch of light only helped by averted vision. There was no real core at all but the area of light was of a reasonable size. Certainly not spirals visible. I was happy that I could at least see something this time though. NGC 6936 Open Cluster - This was in very close proximity to the above and showed quite a nice cluster of decent size. Not too far away was the Iris nebula. Very bright stellar appearance with a touch "extra" around it. OK, so on to some galaxies in Pegasus which is now perfectly positioned. NGC 7814 Mag 10.6 Edge-on spiral galaxy. Trying to see the dark lane that runs through it with some success but it's difficult to hold it's a touch fatter and brighter in the centre. Using the 14 and then the 10mm Delos to hone in on the detail. NGC 7331 - Mag 9.3 Spiral Galaxy - Nice and bright particularly in the centre but a fair extension around the core best viewed with the 17.3mm Delos, higher power not really serving much this time. Stephan's Quintet (Galaxy group in Pegasus) - I'd only had the mearest of glimpses before with my 8" SCT so I was pretty keen to give this a go with the extra aperture! The group is small in size and certainly difficult to resolve in to distinct galaxies without some power. This time however, I managed 4 distinct patches of light. They are actually of reasonable brightness and so the 10mm Delos for 150x helped considerably after the 17.3mm Delos just to resolve these light patches of which were quite small. NGC 7479 Mag 10.97 Barred spiral galaxy - Certainly easy to see the bright bar running through the galaxy core giving a good length to the galaxy but could distinguish and spiral coming from this. Reasonably close by was a group of 3 galaxies on the H2 list: NGC 7626 mag 11.13 elliptical, NGC 7619 mag 11.1 elliptical and NGC 7623 mag 12.8 spiral. The two ellipticals were very easy and quite oblong although small. The spiral was much more difficult although averted vision helped. After that I switched over to the other side of the sky to M81 and M82. M81: massive bright core. I can never see any damn spirals on this though! M82: Great detail! Went to 200x with the Pentax XW 7mm showing a riot of mottled-ness and central area cut distinctly. NGC 3077 - A really decent area surrounding the core was shown (mostly this has previously shown just a stellar appearance) NGC 2976 Mag 10 spiral galaxy.- Of reasonable brightness but nothing distinct. NGC 772 mag 10.3 spiral galaxy in Pisces - I chose this one because I hadn't seen it before and on my list... also it seems an interesting shape! Certainly it did not disappoint with the galaxy showing quite non-uniform almost like a comma. So that was it. Last observation was around 3.30am more or less... My stuff was now totally soaked in dew to boot. Some light high cloud has started to drift in. Orion was now up just about now up which was nice to see. Certainly it had been quite productive and at the same time a very relaxed session. Mostly everything had been easy to find and a frustration free night which is always nice even if the sound of something pouncing on something else quite close by made me jump a bit while at the eyepiece. Thanks for reading and hope the next session is not too far away!
  15. Some Sagittarian Success! (A Hint Of The Lagoon)

    Nice report! Glad you managed to get out there last night. It had cleared here when I looked out 1am but I was beat and retired to bed after a hard day. It's stated and true that the OIII will show you something that would be invisible otherwise without a filter whereas the UHC will only enhance what it is already visible. if you can't see any nebulosity in M8 without a filter (surprising as it's pretty bright!) then the UHC is not going to help much. Get your scope to a decently dark sight and the UHC filter will work much better on these objects. Most of the Sagitarrius nebulae have a fair amount of Hbeta in them which shows with the UHC. the Lagoon is a fantastic nebula when the conditions are right.
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