Guest JSP555 Posted February 1, 2013 Share Posted February 1, 2013 Nice small scope or guide scope , anyway as you know finding a eyepiece to settle on is a minefield , especially with a small tube refractor which is very hard on cheap eyepieces , wanted a cheap 20mm eyepiece so i tried Revalation 20mm, GSO 20mm , GSO superview which was a bit better( same stable ) and the meade 4000 20mm , all showed to much C A for my liking , then tried the skywatcher 20mm ultra view and bingo problem solved ,why this should be i havent a clue , however thoose vastly more experienced than myself might be able to tell me ? many thanks Link to comment Share on other sites More sharing options...
Guest Kheldar Posted February 1, 2013 Share Posted February 1, 2013 (edited) Your problem here is not the EP ... it's the scope I'm afraid As to why you had noticeably better perforumance with the ultra view, I dunno Edited February 1, 2013 by Kheldar Link to comment Share on other sites More sharing options...
Perkil8r Posted February 1, 2013 Share Posted February 1, 2013 Your problem here is not the EP ... it's the scope I'm afraid As to why you had noticeably better perforumance with the ultra view, I dunno Is it possible that the EP has the exact or very close to inverse error of the scope, thus correcting it? Link to comment Share on other sites More sharing options...
Brantuk Posted February 1, 2013 Share Posted February 1, 2013 This is only a guess - but imho the Mead 4000 would be the best corrected out of those eyepieces and probably showed the true CA in the scope. If you try the Skywatcher eyepiece in a well corrected scope I'll bet it shows up some CA attributable to the eyepiece. Certainly worth trying out the theory. Link to comment Share on other sites More sharing options...
cosmic dave Posted February 4, 2013 Share Posted February 4, 2013 This is only a guess - but imho the Mead 4000 would be the best corrected out of those eyepieces and probably showed the true CA in the scope. If you try the Skywatcher eyepiece in a well corrected scope I'll bet it shows up some CA attributable to the eyepiece. Certainly worth trying out the theory. Think you nailed it Kim, sounds like that to me.. Link to comment Share on other sites More sharing options...
Guest JSP555 Posted February 4, 2013 Share Posted February 4, 2013 (edited) This is only a guess - but imho the Mead 4000 would be the best corrected out of those eyepieces and probably showed the true CA in the scope. If you try the Skywatcher eyepiece in a well corrected scope I'll bet it shows up some CA attributable to the eyepiece. Certainly worth trying out the theory. Tried the skywatcher ep in a st102 , as most interested in this , and found the CA was evident mostly around the edges of the ep , then the meade 4000 that was lent to me, was tried again in the st102 and compared favourably to the skywatcher 20mm ultra , to be honest there was nothing in it as to the CA that showed around the edges , although did enjoy the 66 degree feild of view from the ultra, however when using the st80 like you said brantuk, the meade did show more CA, The st80 is a nice little scope , however can be extremely difficult on cheap eyepeices, mind you there also lots of constraints to contend with eps, the eyes of certain individuals , age of individuals , the actual telescope be it reflector or refractor , and quality of said instruments used , im happy that the ultra ep worked on the st80 , however i can say im going to resist ep fever after going thru the hassle to find a ep that worked for me , im quite happy now but reluctant to buy any more for a very very long time , unless i splash the cash for a bigger scope Edited February 4, 2013 by JSP555 Link to comment Share on other sites More sharing options...
cosmic dave Posted February 5, 2013 Share Posted February 5, 2013 My fav is still my TMB 6mm I know a lot of people don't like these but I find them great. What's suits the eye I suppose... Link to comment Share on other sites More sharing options...
BAZ Posted February 5, 2013 Share Posted February 5, 2013 I have a 6mm TMB, and it's not bad, it's good in the centre, but a bit fuzzy at the edges, that said, I do like it. Link to comment Share on other sites More sharing options...
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