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timwetherell

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About timwetherell

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    Star Forming

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    Somerset
  1. Yeah, my experience is similar. A 4" will begin to resolve globulars and give some quite decent views of brighter DSOs - I'm not saying an 80mm couldn't do that, but I've always found it much more of a struggle with a 3" refractor than a 4". Back in the day when many of us had the ubiquitous 60mm, a 4" refractor was classed as a "big" telescope!
  2. I use a 2x 2" barlow for imaging sometimes and a focus is achievable but that's on a refractor with a long focuser range. I presume you're using your 200p Newtonian? which probably has a more limited focus travel. If the barlow is pushing the focus point further out you might be able to use an extension tube?
  3. I have an esprit 100 but not the camera. If you tell me the weight of your camera I'd be happy to mock it up with weights and tell you the balance point
  4. Thanks Mark Yes, I had the same experience with M69 and M70. Really difficult unless the sky conditions are absolutely perfect. The slightest haze of any kind on the horizon will totally obscure them. I guess it's because they are extended fuzzy objects so super sensitive to contrast whereas M7 is a collection of brighter pinpoint stars which is a bit more forgiving of residual sky brightness.
  5. I used a 31 Nagler in a Friend's 180 and didn't notice any obvious vignetting
  6. If you're going to shorten the tube, might be worth considering fitting a 2" diagonal so you can use 2" EPs and get a huge field of view. My finder is a short focus 66mm and with a 2" 40mm ep has a field of view of almost 8 degrees. The downside is that it may introduce weight issues depending what your mount etc is
  7. That's 3 degrees in Somerset, probably be lucky to have 1.5 up in Harrogate However being discrete stars rather than a fuzzy, I rekon it would be possible. Visually I found M7 reasonably easy to see but the globulars nearby M69 and M70 were a real challenge. Totally impossible under all but the very clearest haze free skies and even then right on the limit of my vision.
  8. Very pleased to have been able to capture M7 last night - only really visible for a couple of weeks in midsummer and even then only about 3° above the horizon. Stellarium suggests it should be possible for anyone south of Newcastle with a really good south horizon.
  9. My obsy is quite small so at the extremes there's only about 400mm between the EP and the circular wall. At first I was worried this would make it a bit tight but actually I really like it because I can lean on the wall when observing which really helps with comfort and steadiness at the EP - it also lessens the chance of spilling my brandy
  10. For me it's blow any dust off with a hurricane blower, then gentle wipe with un-perfumed facial tissue moistened with pure ethanol. If there are any water soluble marks remaining I breathe on the lends to fog it and again wipe with tissue. My main rule is one wipe per tissue then get a new one so I can get through half a box cleaning the objective! Only needs doing about once every two years though.
  11. I have a nice WO 1.25" erecting prism - it's outstanding for low magnification terrestrial use but does degrade the image somewhat above about 100x. The biggest problem using it for astronomy is that you get a really big diffraction spike from the cemented joint between the prism components. And of course the extra glass and surfaces drops the contrast a little. Great for looking at ships at sea though
  12. I've been very, very impressed with the Esprit 100! Excellent optics for the money I'm sure you'll enjoy it
  13. I've done this once or twice with my refractor when looking for Sirius B in the UK to get the very least scatter possible. I could convince myself there was a tiny difference but to be honest, the difference between good seeing and bad was a million times greater than anything the diagonal introduced. On a good night the pup is pretty clearly visible and on a bad night, it's just not there It is a literal pain in the neck for higher objects though. And my observatory is quite small so there's only just room for my head between the wall and the eyepiece when focused all the way out like that
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