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Old 30-10-2019, 07:45 AM
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Atmos (Colin)
Ultimate Noob

Atmos is offline
Join Date: Aug 2011
Location: Melbourne
Posts: 6,906
The way I’ve found best is to focus on the centre, find the worse corner and then rack the focus in or out and see whether it’s inside or outside focus. If you can put a digital focused on the RASA you can calculate how far out it is in microns.
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