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10" f4 Newt. focus problem.
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28-09-2015, 02:26 PM
glend
(Glen)
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Join Date: Jun 2013
Location: Lake Macquarie
Posts: 7,051
Did you ever do the Moon test with a piece of paper to see exactly where the focal point is located - as suggested a couple of times below? Seems like a better use of your time if you can pin it down before you start building mirror sliders.
glend
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