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Old 06-07-2014, 08:39 PM
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Robh (Rob)
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Join Date: Feb 2009
Location: Blue Mountains, Australia
Posts: 1,338
I assume you are talking about the finderscope. I don't know anything much about your particular finderscope. I assume, according to the specs on the web, that it is a 10x50mm finderscope and that it already has an illuminated EP.

If the finderscope has at least a 200mm focal length, then the EP that comes with it is probably about 20mm. 200/20=10x.

It would defeat the purpose of the finderscope in using a 9mm EP as this would change the finderscope into a 22x50mm with a much narrower field of view. I am guessing that the finderscope would not have enough in focus with the diagonal to go from a 20mm down to a 9mm.

Regards, Rob
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