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    velasoraptor's Avatar
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    Question 2 inch Eyepiece Performance

    Are 2 inch Eyepieces provide additional Brightness/Contrast in image because of more light gathering power over 1.25" eyepieces?
    Are they more expensive?
    which are popular 2 inch Eyepieces used by astronomers?
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    KT4HX's Avatar
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    Two inch models are made to take advantage of the wider FOV in longer focal length EPs, starting around 24, 27 or 30mm and upwards (depending on manufacturer and model). The extra barrel diameter will allow you to enjoy the broader view without cutting it off. The shorter focal length EPs have a smaller FOV and it is easily contained in the 1.25 inch diameter barrel, that is why you normally don't see two inch models in EPs under 24mm (there are some exceptions to that). Plus 1.25 inch EPs are cheaper to manufacture since you have less glass in them, so why make a 2 inch 9mm for example when you don't gain anything as far as the view because the FOV is already smaller anyway.

    I know a lot of people here on the forums like the GSO Superview EPs for their performance and reasonable price. Pretty much every company has two inch models: Televue, Explore Scientific, Zhumell (essentially GSO), Orion, Meade, Celestron, etc. You will find there is a wide price range depending on EP focal length, brand name, construction design, etc. It really comes down to how much a person is willing to spend. For most there is a compromise in cost versus performance threshold. I recommend doing some research on the internet, reading reviews and such in order to make an informed decision.

    Here is a quick review of the GSO Superview by Gus:

    GSO SUPERVIEW 68° Telescope Eyepieces Review
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