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I am just wondering what the mirror quality will be like.
As the mirror gets larger and faster it gets logarithmically more difficult to make and specifically to make well. While a very large number of the GSO and Synta mirrors I have seen have been very good they have been smaller aperture and a good bit slower in F-Ratio. A 20"/F4.3 mirror is starting to push the envelope even for a premium mirror maker. It may still be a ways for the mass produced Asian factories to get right. Buyer beware.
Cheers,
John B
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