Doc Posted July 27, 2015 Share Posted July 27, 2015 It shouldn't show up in a finder, you normally have to push the magnification up before you see it. Link to comment Share on other sites More sharing options...
Tweedledee Posted July 29, 2015 Share Posted July 29, 2015 Got a couple of 2" eyepieces flying over the Atlantic. Russell Optics 55mm Custom Konig XL - what an eye lens! ... and 19mm Super Wide Konig... M. 1 Link to comment Share on other sites More sharing options...
M. Posted July 29, 2015 Share Posted July 29, 2015 Nice Just checked their website out. Interesting that they make a 1.25" 50mm plössl. Link to comment Share on other sites More sharing options...
Tweedledee Posted July 29, 2015 Share Posted July 29, 2015 Nice Just checked their website out. Interesting that they make a 1.25" 50mm plössl. They do, but it will be like looking through a straw. The bigger focal lengths need 2" to take advantage of any reasonable field of view. Link to comment Share on other sites More sharing options...
M. Posted July 29, 2015 Share Posted July 29, 2015 Do you rate their stuff then? Link to comment Share on other sites More sharing options...
Tweedledee Posted July 29, 2015 Share Posted July 29, 2015 Do you rate their stuff then? I will soon find out. Got these for an absolute bargain price secondhand and just fancied giving them a try. Will probably sell them on. Years ago I had one of their 2" 65mm Plossls and it was great especially at the price. The long focal length eps will work better on your F10 scope than on mine. Link to comment Share on other sites More sharing options...
Doc Posted July 29, 2015 Share Posted July 29, 2015 I wonder what they will be like. I see they have a 85mm and a 72mm as well. Whats the fov in them. I've heard it's 70° but I can't believe that, more like 45°. Link to comment Share on other sites More sharing options...
Tweedledee Posted July 29, 2015 Share Posted July 29, 2015 I wonder what they will be like. I see they have a 85mm and a 72mm as well. Whats the fov in them. I've heard it's 70° but I can't believe that, more like 45°. I'm intrigued as to how they perform in shorter ratios. Apparently they are good to the edge in longer ratio scopes as you'd expect. They are supposed to be excellent quality for the price. The 55mm should be better near the edge than the 17mm which has a wider apparent field. The field of view is about 50 degrees in the 55mm, the formulas mean it can't be larger than 50 degrees, unless the laws of physics change . That is using the widest field lens possible in a 50mm barrel. I think they use the same size for the eye lens . The 19mm is 70 degrees. I want to check out the effect of oversized exit pupils using the 55mm in the refractor. Link to comment Share on other sites More sharing options...
Tweedledee Posted July 29, 2015 Share Posted July 29, 2015 When limited by a 2" barrel, the 72mm could be no wider than 37 degrees and the 85mm no wider than 31 degrees. Link to comment Share on other sites More sharing options...
Doc Posted July 29, 2015 Share Posted July 29, 2015 Shame they don't make the 72mm and 85mm in a 3" barrel then maybe that could be extended to 70°. Link to comment Share on other sites More sharing options...
Doc Posted July 29, 2015 Share Posted July 29, 2015 (edited) 85mm will give me mag x9.8 and a 3.16° FOV If they did a 70° eyepiece my specs would be mag x9.8 and fov of 7.16° Edited July 29, 2015 by Doc Link to comment Share on other sites More sharing options...
Tweedledee Posted July 29, 2015 Share Posted July 29, 2015 Shame they don't make the 72mm and 85mm in a 3" barrel then maybe that could be extended to 70°. An 85mm limited by a 3" barrel would be a maximum of 47 degrees. Link to comment Share on other sites More sharing options...
Tweedledee Posted July 29, 2015 Share Posted July 29, 2015 These are big eyepieces but they won't fit your average focuser... http://www.eastmidlandsstargazers.org.uk/topic/8951-big-eps-anyone/ Link to comment Share on other sites More sharing options...
Doc Posted July 29, 2015 Share Posted July 29, 2015 You can see why the big firms don't make these. There is just no call for them. So it's not worth their time. Link to comment Share on other sites More sharing options...
Tweedledee Posted July 29, 2015 Share Posted July 29, 2015 You can see why the big firms don't make these. There is just no call for them. So it's not worth their time. I bet Zeiss did a run of about a dozen of these, just for the real big observatories. Link to comment Share on other sites More sharing options...
M. Posted July 29, 2015 Share Posted July 29, 2015 I reckon I'd need counterweights for them, don't think my clutch would deal the load lol Link to comment Share on other sites More sharing options...
+Bino-viewer Posted July 31, 2015 Share Posted July 31, 2015 I've 'upgraded' the 3.5" end cap on the back of my focuser. This one does away with the 2 thumbscrews and uses a collet style tightening ring (2 inch opening) instead. Also got the matching 2 inch dust cap (with desiccant) to go with it. From Starlight instruments LLC, Indiana, US. (11 days from order to local collection) Both ridiculously expensive...... Untitled by Untitled by Untitled by Untitled by M. and BAZ 2 Link to comment Share on other sites More sharing options...
Doc Posted August 1, 2015 Share Posted August 1, 2015 Very nice Rob but as you say anything from Starlightis mega expensive. Why can't Skywatcher do something like this on their scopes. Link to comment Share on other sites More sharing options...
Cazz Posted August 6, 2015 Share Posted August 6, 2015 A second hand, but unused, pitch at Kelling - on the blue field! :-) Link to comment Share on other sites More sharing options...
Doc Posted August 6, 2015 Share Posted August 6, 2015 (edited) Just bought a heavy duty fully waterproof cover from Cygnus Astro Covers. It came within two days and is so well made. View his website here: http://neilross758.wix.com/cygnus-astro-covers#!heavy-weight-covers/c1fj2 Edited August 6, 2015 by Doc Link to comment Share on other sites More sharing options...
Daz Type-R Posted August 6, 2015 Share Posted August 6, 2015 A second hand, but unused, pitch at Kelling - on the blue field! :-) Nice one Cazz, did you snap it up off ABS? Link to comment Share on other sites More sharing options...
Cazz Posted August 6, 2015 Share Posted August 6, 2015 Nice one Cazz, did you snap it up off ABS? I did, I had a very helpful heads up message this morn. [emoji106] Link to comment Share on other sites More sharing options...
Daz Type-R Posted August 6, 2015 Share Posted August 6, 2015 Is it pitch 202? Your not that far from us. Link to comment Share on other sites More sharing options...
Cazz Posted August 6, 2015 Share Posted August 6, 2015 Is it pitch 202? Your not that far from us. Yes, I think that's what it said, I've done things since then lol. Link to comment Share on other sites More sharing options...
Sheila Posted August 6, 2015 Share Posted August 6, 2015 Yes, I think that's what it said, I've done things since then lol. Cazz you do remember the blue field is strictly no dogs dont you Link to comment Share on other sites More sharing options...
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