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Old 3rd September 2012, 09:30 AM
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rich rich is offline
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Join Date: Nov 2008
Location: Shebbear, N Devon
Posts: 1,643

It's either not optically centred or not parallel to front element and square with the optical axis.

Is it possible to rangefind with it in position, then swing it out of the way and shoot without it, or is the image too blurred even on 20 mag?

You may find that the CFA actually clicks into a different position every time you use it; this can happen when the Butler Creek hinge gets a bit clapped.
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