Circle in the picture from Sigma 50mm non-Art lens

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charlieY Regular Member • Posts: 402
Circle in the picture from Sigma 50mm non-Art lens

It shows at f/1.4 and f/1.8 with 6D II.

From f/2.0, it's gone.

No filter on the lens.

What is this?

at f/1.4

at f/1.8

at f/2.0

 charlieY's gear list:charlieY's gear list
Canon EOS M5 Canon 6D Mark II Canon EF 100mm F2.8L Macro IS USM Canon EF 70-200mm F4L IS USM Carl Zeiss Distagon T* 2/25 +5 more
Canon 6D Mark II
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