Sigma SA Mount

Started 3 months ago | Discussions thread
danski0224 Senior Member • Posts: 1,219
Re: focusing

Tom Schum wrote:

Again, this is the camera trying to be "helpful" by changing the aperture for you even if you don't want it to, but the lens is not the culprit here. Most digital cameras can't help it, and can't be set up to just leave that aperture where you want it to be. It's a problem that won't go away!

I would suspect that the lens being wide open has something to do with the AF sensors being used (DSLR).

A native f/2.8 lens will use different parts of the DSLR AF sensor than a native f/4 lens.

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