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I bought the 10"x10".
I think you'll need at least the 12"x12" for your 25x100s
I've only done a bit of testing with 12x 60 and even less with 20x80. So far the view though my el-cheapo binoculars doesn't look much worse with the light bouncing off this mirror. But I'm not particularly fussy so I wouldn't be surprised if Mark's words are the situation with the mirror I bought.
I see you have posted in my thread - I'll move over there.
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