what causes the poor quality

Started 1 month ago | Questions thread
Stacey_K Veteran Member • Posts: 8,944
Re: what causes the poor quality

ocean76 wrote:

the aperture is f8 (I lose 2 stops) I believe if the sigma extender is on, if not, then the aperture is f4 I think.

So you are using a f4 zoom wide open at the end of the zoom range with a 3rd party 2X converter pixel peeping on a crop sensor body... Try at the very least stopping the lens itself down to f8.

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