New G1X II Sample Images

Started Feb 26, 2014 | Discussions thread
technic Veteran Member • Posts: 8,932
Re: why f/6.3? tripod for shot #2?

Dale Buhanan wrote:

CAcreeks wrote:

I wonder if f/6.3 was chosen to maximize DOF. You would think that diffraction would start to be an issue at that aperture, but the architectural details are very sharp.

The EXIF maker notes say "Image Stabilization = 257." Do any Canon experts know what that means? You would think that the photographer would disable IS if on a tripod.

Remember that this is a large sensor camera, just a little smaller than APS-c. So diffraction does not start on this camera until about f11. F16 would be well into the diffraction region, but f6.3 would not. That would be just fine.

That's just theory. The 15-85IS - which is a somewhat similar lens - already gets a bit soft at f/8 and by f/9 it goes rapidly downhill over most of the zoom range. I would not be surprised to see the same with this lens, but starting around f/6.3 already because of the slightly smaller sensor and larger maximum aperture (= peaks earlier).

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