focus accurancy Sigma 18-50 on CL

[tom0511]

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I recently have used the Sigma 18-50 more often and when reviewing my images I feel there are some images which show slightly worse focus accurancy (faces not allways totaly sharp).

I understand shallower DOF but also seems compared to primes. I did not do scientific comparison though. I just realized when post processing my vacation images.

Do others have similar experience? Could it be the Sigma focuses slightly less accurate sometimes when used on Leica CL?

 

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[wda]

Not in my experience. Are you sure it is not camera shake?

I usually use hybrid focusing, with the aid of focus peaking, with all of my lenses. None of my Sigma lenses give me cause for concern.

[lct]

No focus issue with the Sigma 18-50/2.8 here. Beware that DoF can be shallow on close-ups, especially at full aperture. Below at f/2.8.

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[jaapv]

Can the AF be adjusted through the USB Dock?

[d30gaijin]

On 9/12/2023 at 11:22 AM, jaapv said:

Can the AF be adjusted through the USB Dock?

It can via the Sigma USB dock but it is a very time consuming process of: Make a correction, try it.  Make another correction, try it.  And it needs to be done at each focal length for best results.  It goes quicker once you develop a feel for it.  It also require a test chart/triangular box that can be found on Amazon.

[d30gaijin]

On 9/1/2023 at 5:25 AM, tom0511 said:

I recently have used the Sigma 18-50 more often and when reviewing my images I feel there are some images which show slightly worse focus accurancy (faces not allways totaly sharp).

I understand shallower DOF but also seems compared to primes. I did not do scientific comparison though. I just realized when post processing my vacation images.

Do others have similar experience? Could it be the Sigma focuses slightly less accurate sometimes when used on Leica CL?

 

I have a TL2 (same sensor and AF system) and the Sigma 18-50 f/2.8 lens.  I have not experienced any abnormal amount of missed focus.  But when I have the time I will usually do a double tap shutter button half press to get two lock on's before pressing the shutter all the way down.  The contrast detection AF of the CL & TL2 are not the best out there.  I think they require a bit more deliberate attention to focus than cameras with phase detect AF.

[lct]

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AF works fine on both static and moving subjects in my experience. I never had to use an USB dock then (digital CL, Sigma 18-50/2.8, FF and crops).

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