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Old 07-25-2019   #22
Kostya Fedot
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Ko.Fe. is offline
Join Date: Jul 2013
Location: MiltON.ONtario
Posts: 7,844
Lens needs to be tested at both aperture ends. Closed aperture, against the brick wall.
This will show if centering is correct.

And into the sun, the see how it handles the flare.
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