I'm curious as to the differences between the f6.8 and f7.7 dagors. The f7.7 versions seem to be in longer focal lengths, often are said to have greater coverage, and are usually more costly---but why? Is the difference in the design of the f7.7? Is it a justifiably more desireable version of this legendary lens? I asked this question on that other forum but I thought the more savvy optical gurus over here might provide a more detailed answer. Thanks for any and all info.-------cheers!
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