|
First of all, how high a focal length you can deal with depends on your scope (I forget the formula), with my 1200mm, 10" F5 Dob, any eyepiece above about 32 mm will apparently be vignetted. So don't go for an eyepiece with a longer focal length than you can use.
Secondly, I (and I think most people) don't end up using such low magnifications very often, so unless you are very sure you will, I wouldn't break the bank to get the best. On the other hand I find a wide-angle 2" eyepiece does give great "my head is in the stars" type views.
So I have the MyAstroShop 30 mm 80 degree Ultra Wide 2" eyepiece (currently at $129). This same eyepiece is sold at various places under different names and at different prices, so look around! The build quality is good, it's a nice solid eyepiece. Weighs quite a bit though.
In my F5 scope there is a lot of visible coma with this eyepiece, I'd say about the outer 30% (in terms of radius - so quite a lot in terms of field of view) suffers from coma. With the outer 10% looking very smeared. If your scope is slower it won't be as bad, but that is what you get at this sort of price. If you want sharp stars over 70-80 degrees AFOV in a fast scope I think you'll have to pay a fair bit more.
I still quite like the eyepiece, it does give those big views with it's very large eye lens and is great as a finder eyepiece for deep sky objects that can't been seen in my standard finder.
|