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Forum: Visitors' Center 03-05-2019, 06:58 AM  
Recommended Lens for K3-II Astrophotography Produced Anything But Stars
Posted By JensE
Replies: 21
Views: 2,278
My 8mm FE only considerably sharpens up at f/5.6. And I had to significantly adjust the focus scale (screw under the focus ring rubber clamps it).
Maybe yours is similar.

My 12mm FE however is sharp across the frame (K-1) even fully open at f/2.8.
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