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Everything posted by Andrew*

  1. Just popping in to say... Congratulations, John! 30,000, and every one of them valuable and helpful to making this forum what it is.
  2. Phone AA - I'm sure they will be able to advise.
  3. Thanks Jules, I've dropped him a PM.
  4. Does anyone know of anyone who would be able to collimate a triplet refractor in the general vicinity of Cambridge?
  5. Ah, right. Didn't know that. Thanks for the explanation. Don't get me wrong - I am intrigued as it's a new product to me. I would love to try one out at some point :-)
  6. Indeed, so why not make them 20mm, or even 15mm aperture? Nothing lost (except profit for Vixen of course).
  7. I don't get this at all. Why pay for 42mmof aperture when no human on earth could make use of the 20mm exit pupil? Could someone please explain?
  8. You can't buy them in the UK at all. I spoke to TH, the importers, and they said Meade don't release any for UK sale. When I spoke to Meade USA they were not happy to sell me one, and were not even happy to repair the "rust" on my one. Even trying to get a secondhand one is difficult because they are all bundled with etalons and nobody wants to split them. It's a hopeless, ridiculous situation. Lunt BFs are your only reasonable bet, but I still haven't heard for sure if you can use them with a PST mod. Coronado SolarMax II anyone?
  9. Basically, for a gentler learning curve and convenience, choose the ED120, although, there is not much difference in that respect. For image quality, the 190 is the obvious choice. Which is more important to you?
  10. I spotted Lovejoy last night in 45mm binoculars. Large, bright with a distinct stream of tail streaming up towards the keystone. Probably the best comet I've seen since Hale-Bopp. Holmes was of course exciting, but not as impressive visually. of course I've also been keeping tabs on Venus recently, and last night I could make out its crescent in the binos.
  11. Was a great show, I saw about 10 in a short time, maybe 30-40 minutes of looking. At one point I was standing with my brother in law looking east and purely by coincidence we both turned round spontaneously to see a breathtaking fireball stream across the southern sky!
  12. I was looking for about 20 minutes and saw 5, so not too bad.
  13. Couldn't get that to open. I think you need to get the public link from Dropbox.
  14. Several half-hours later..... https://www.dropbox.com/s/3wzg7ee9ock2scu/Sun_122154.avi This is what I made of it. See what you can do first, then I'll tell you what I did. With colour
  15. I will try and explain the difference between binos and maks in terms of observing quality, but some aspects are less "technical" than others. First of all, the central obstruction presents some disadvantages. A 25% CO will reduce the area by over 6%, resulting in 6% less light (not a great deal), 6% less resolution (a bit more of a deal) and quite a lot less contrast (a biggish deal). In my experience, you cannot push the magnification on obstructed designs quite like you can on refractors. Another issue is comfort and convenience, which can't be quantified. With binos you do not have to faff with eyepieces or even much with focus. You don't need a finder. You don't need slow motion controls. You just observe and pan the sky. You have to try them to appreciate this. I understand what you're saying about binos having an "unnecessary" extra barrel, but using two eyes is so much nicer and more natural than squinting through an eyepiece. More comfort means you see more. You could say binos have the disadvantage of only one magnification, but you're not going to get very high mags on a 70mm aperture anyway.
  16. 1. I think that will be quite a frustrating set up to use. I think those table top tripods are pretty hopeless, but happy to be corrected. For mounting it, you will find a lot more choice in photography tripods. 2. I think the Orion and GSO barlows will probably be decent 3. You will perhaps achieve 120x magnification, but not a lot more. That central obstruction kills the resolution quite a lot. 4. Don't bother with a moon filter. I don't even with a 12" scope. The only filter I might think about is a UHC filter, but it's not really worthwhile for this scope. 5. To be quite honest, I think you will find a pair of 15x70 binoculars with a mounting solution of one kind or another far more enjoyable to use, not to mention more portable and probably cheaper. The wider fields of view are much more enjoyable with this aperture. As for your question in your follow-up, it's very common to have the scope as a relatively small proportion of the total set-up.
  17. It's a great idea which I think was done in a thread a while ago. I do not seem to be able to find any lunar data, but I am currently uploading an avi with some Ha sun footage, which is very similar to lunar data in terms of processing. An important difference is that the seeing is much worse on the sun so you will need a smaller % of frames - maybe 10-20%. I'll give you the link when it's finished uploading it's about 400MB so maybe half an hour? Andrew
  18. The only way is to click "Close advert"
  19. ...for the first line until I got to "light nanoseconds" http://apod.nasa.gov/apod/ap131101.html This is such a clever shot.
  20. I still wouldn't put you at the focal point of a 120mm scope though.... Sorry.
  21. To be honest I wasn't that impressed with the 31mm Aspheric I had in a 8" f/5 scope. It wasn't bad, but wasn't great for the price. I would rather recommend the Skywatcher Aero range. As for which one, if you have no local light pollution (i.e. light shining on your observing spot), and if your pupils can dilate larger than 7mm AND if your transparency is better than limiting magnitude 5, then you should get the 35/6mm. You can measure your pupils yourself by shutting yourself in a dark room for a couple of minutes, then taking a flash shot of your eye with a ruler next to it, but if you are older than 30 I'd imagine your pupils do not quite achieve 7mm. If in doubt, get the 30/31mm as you will still get 50x magnification, so a decent field of view for your lowest magnification. Personally, I've always had good conditions (young eyes and not bad light pollution) and very much enjoyed the extra fields of wide eyepieces. I love them. Andrew
  22. Is it really that colour!? Wow. Also, what is that "extra" star above right of centre in the inset image?
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