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but the tangential field is quite flat. We would expect this lens to have some astigmatism in the 10mm to 15mm off axis area (the middle third of the image) even stopped down, but that it would have less astigmatism near the edge. Also you can see that the tangential and sagittal ...
Ten days later (shipping to Japan takes a while), Sigma emailed to tell me the lenses I sent back tested much worse than their original end-of assembly tests. Their new tests agreed with my findings and were, in their words ‘not acceptable for this lens.’ I’ve heard ‘this lens is...
Avoid these conditions, which may make the lens or monitor dirty, cause mold, or damage the camera. ● If condensation does occur, turn off the camera and wait about two hours before using it. Once the camera adjusts to the surrounding temperature, the fogging will clear naturally. ■ ...