stafford_stargazer Posted February 7 Share Posted February 7 (edited) Meade Polaris 80mm f11.3 achromat. Just picked one up like new in box for very little. Looking at tree branches at 150x the chromatic aberration does seem that bad at all to be fair. Just wondering how it might do for planets? Hopefully star test this evening and check Jupiter. Even the mount seems very sturdy, better then some I've seen coming with scopes. Thanks Gary Edited February 7 by stafford_stargazer 2 Link to comment Share on other sites More sharing options...
happy-kat Posted February 7 Share Posted February 7 Looks a great find. 80mm aperture and the long focal length (what does the label say on the telescope) makes for a forgiving Focal ratio (maybe f10) so reduced CA. Should give pleasing planet views. Observe patiently and you'll hopefully catch moments of good seeing. 1 Link to comment Share on other sites More sharing options...
IB20 Posted February 7 Share Posted February 7 Should be fine at f11.3, certainly the right side of any chromatic aberration as per the attached chart. You’ll probably see some colour fringing the brightest objects but it shouldn’t be too intrusive. 1 Link to comment Share on other sites More sharing options...
stafford_stargazer Posted February 7 Author Share Posted February 7 6 hours ago, happy-kat said: Looks a great find. 80mm aperture and the long focal length (what does the label say on the telescope) makes for a forgiving Focal ratio (maybe f10) so reduced CA. Should give pleasing planet views. Observe patiently and you'll hopefully catch moments of good seeing. Thanks for reply. Tried on Jupiter this evening, the views were very good to be honest, I didn't see any trace of CA even at 150x although seeing wasn't very good. F11.3 so seems quite a nice scope. Thanks again Gary Link to comment Share on other sites More sharing options...
stafford_stargazer Posted February 7 Author Share Posted February 7 1 hour ago, IB20 said: Should be fine at f11.3, certainly the right side of any chromatic aberration as per the attached chart. You’ll probably see some colour fringing the brightest objects but it shouldn’t be too intrusive. That's a great chart, thanks, I saw no evidence of CA this evening on Jupiter. Crisp views.. very nice to be honest. Thanks for reply. Gary 👍 1 Link to comment Share on other sites More sharing options...
happy-kat Posted February 7 Share Posted February 7 That's great and there's the comet if its clear for you still 1 Link to comment Share on other sites More sharing options...
stafford_stargazer Posted February 7 Author Share Posted February 7 8 minutes ago, happy-kat said: That's great and there's the comet if its clear for you still Oh yes, although clouds have rolled in now. Typical 😭 Link to comment Share on other sites More sharing options...
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