80mm f/6 FPL-53 doublets in the US?
Posted 07 November 2013 - 02:40 PM
Posted 07 November 2013 - 02:45 PM
Posted 07 November 2013 - 03:07 PM
I keep telling people that the EON is the best scope. Its so good random strangers walk up to look through it even at sunset.
Posted 07 November 2013 - 03:16 PM
At f/7.5 (a little longer than you asked for) it will have better color correction than at f/6 and it is FPL-53 as you requested.
I knew about this scope but did not realize it had the FPL-53 element. At that price, compromising on focal length could be an option since I could always get the 0.85x reducer/flattener that is (was?) available for these 80mm f/7.5 doublets. But by the time you do that and add in a good focuser you are back up around the price of one of the more deluxe f/6 scopes...there is no free lunch it seems.
One issue I have is that I already made an investment in the Orion flattener for short refractors (the one that doesn't change the focal length) in anticipation of finding an f/6 'fractor for AP. Maybe the simple answer is that I just need to be more patient in the used market. One of the SW Equinox came up on Amart last week but I was too slow on the trigger. In fact I was 0-3 on Amart items last week, which was really annoying :bangbangbang:
If you don't need the F/6 focal ratio for visual, the C80ED seems like a good way to go...
Posted 07 November 2013 - 03:31 PM
No CA as far as I can tell on the 80MM EON. Never believe anyone that hasn't used the scope talk about it.
Can't wait to start getting pics like that with my EON 80!
Posted 07 November 2013 - 03:43 PM
One thing, you will need a field flatner for the F6.25 scopes. Especially with a larger chip. This was with a 25 by 17MM chip and as you can see even with the field flatner, the extreme edge of field has a few oblong stars, without a field flatner there is noticeable star elongation.
I use this one:
Posted 07 November 2013 - 03:46 PM
Posted 07 November 2013 - 05:03 PM
Posted 07 November 2013 - 10:03 PM