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Actually hOughy there are three and the seller made me aware of them. They are three 1mm pits that could have been caused by flares?, the type the air forces use to confuse heat seeking missiles. These become more apparent at F11 as the depth of field increases. At F1.9 they are grey smudges.
Anyway it works fine for 'all sky'.
I just won a 'better' fisheye on EB.. 165 degrees FOV 3.45mm FL and F1.5! and flawless!.
Still can't help myself!
Bert
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