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The distance from the focal plane to the barlow?? I thought the critical measurement was from the focal plane to the "last item in the line" - the camera in this case.
So is the distance from the focal plane to the barlow the important measurement because it is simply a barlow in there (and therefore I should always pay more attention to where the barlow is), or is it because it is the first "lensed" item (if thats the right word) in the line?
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