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Recommended widefield eyepiece for 770mm refractor

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I'm looking for an eyepiece for widefield viewing with my 110mm F7 (770mm) refactor. Mainly for starfields.

I've not had 2" eyepieces before and am tempted by one of these; to date I've only had 1.25" up to 32mm. The WO SWAN 40mm looks promising, although I've not handled it. 

Any recommendations? Assume a budget under £200.

Thanks, R 

Edited by Richard136

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The SWAN's are OK but do suffer from some distortions in the outer field of view when used in scopes faster than around F/8. At 40mm I use an Aero ED 40mm and that works really well in my F/6.5 102mm and F/7.5 120mm refractors. Stars are sharp pretty much right across the field of view plus the Aero ED 40mm is quite light for a 2 inch multi element wide angle eyepiece.

There are other options within your budget such as the Explore Scientific 68 degree 40mm if you are prepared to buy secondhand.

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The 40mm Aero ED is discontinued and unavailable anywhere in the world.  The next widest option is the 35mm Aero ED which is pretty good as well, and priced well.  I compared it to some other longer focal length eyepieces I own in the following through the eyepiece photo:



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