SAF Front Focus and CAF/SAF Focus Comparisons with the 300mm f4 – E-M1s.

Started 3 months ago | Discussions thread
OP drj3 Forum Pro • Posts: 10,939
Re: SAF Front Focus and CAF/SAF Focus Comparisons with the 300mm f4 – E-M1s.

Interceptor121 wrote:

Something is going on with the programming of the functionality here. I doubt it is a hardware problem

I am convinced it is the CDAF algorithm.  It has a slight bias for the closer area within the focus points.  As long as the user is aware of this issue, it is easy to avoid the problem.

It would rarely be a problem when one uses a single or limited focus area.  I almost always use SAF and a single focus point with my 12-100mm f4 lens unless I am photographing a moving target or a small target at minimum focus distance.

It can be a problem when you have a very shallow DOF with very long telephoto lenses when photographing close targets or a very fast lens of any focal length photographing close targets.  It is typically a difference in focus around the chosen focus point since the focus point would generally be within the DOF.

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drj3

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