Sigma SA Mount

Started 2 months ago | Discussions thread
xpatUSA
xpatUSA Forum Pro • Posts: 17,946
Re: focusing

danski0224 wrote:

The instruction manual for any current Canon DSLR will show what focus points are available for each given lens.

The number and type of focus points available changes based upon the native f stop of the lens.

OK, understood - not an optical effect and nothing to do with the Sigma SA mount.

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