Sigma 16mm f/5.6 AF problem

Started 2 months ago | Discussions thread
Kogel
OP Kogel Regular Member • Posts: 107
Re: Sigma 16mm f/5.6 AF problem

Mike Evangelist wrote:

Using autofocus for this sort of test is not a good idea. I'd use manual focus, then run two sets of test shots - one leaving the focus untouched for all apertures - the second set refocusing at each aperture. That way, if there is focus shift, you'll see it in the first batch.

I will try again with MF.

For the test I tried to use the camera the way I usually use it - landscape (infinity) and autofocus (wide or expand flexible spot).

Had some problems in the past, couldn't find out why (thought the lens was not sharp at this aperture) Lens seems ok, but this weird AF bug destroys photos at f/5.0 and f/5.6.

In addition, I'd probably repeat both tests three times, at close, medium and far distances.

Use the lens for landscape only.

 Kogel's gear list:Kogel's gear list
Sony a6500 Sony E 10-18mm F4 OSS Sony E 16-50mm F3.5-5.6 PZ OSS Samyang 12mm F2.0 NCS CS Sigma 30mm F1.4 for Sony E +4 more
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