what causes the poor quality

Started 1 month ago | Questions thread
MOD Tom Caldwell Forum Pro • Posts: 38,006
Re: what causes the poor quality

Stacey_K wrote:

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.

Good stuff Stacey, this is a setup made to fail, and we might wonder why the images are not perfect ....

If all other advice fails then there is nothing left to check but the actual optico-mechanical components used.

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Tom Caldwell

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