Sigma 8mm f/3.5 EX DG - what should the circle's diameter be?

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uri.raz

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I've recently bought a Sigma 8mm f/3.5 EX DG circular fisheye lens.

The image circle's diameter is a bit under 20mm [Calculated as (circle's diameter in pixels / image's width in pixels) * 24], with two circles surrounding it - apparently something inside the lens. I'm attaching an image to illustrate. I expected the image to be 23mm-24mm in diameter.

Is this the lens' correct behavior, or should I send it to be fixed ?

Thanks in advance, Uri.
 

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  • Sigma 8mm f3.5 sample.jpg
    Sigma 8mm f3.5 sample.jpg
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