FE 24-70 f/4: Holding me back from going to A7x

Started Aug 26, 2015 | Discussions thread
Bob Tullis
Bob Tullis Forum Pro • Posts: 37,110
Re: FE 24-70 f/4: Holding me back from going to A7x

Alpha Photo wrote:

"... Dust doesn't show up unless you are shooting at F16 or F22.."

I think that is false.

Dust sits on the sensor and therefor is independent of lens f-stop. What you are thinking about is dust between the lens elements. All other points I agree. Dust does not worry me (and I live in the desert).

While dust may be present it is more readily discernible the more one stops down.   If you don't stop down past f/5/6 or so much you may well have quite a bit of dust and never realize it, unless the motes are relatively large.

Point your camera at a light colored wall, use MF to insure the wall is NOT in focus, stop down to f/22 and take a shot (doesn't matter if it's a longer exposure than is reasonable for sharpness).  You may be surprised.   The light is less scattered and is shone more perpendicular to the sensor the more the lens is stopped down, the better to cast distinct shadows from the dust may be present.

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...Bob, NYC
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