My initial tests are showing the AF front focusing issue similar to as described by others here, in certain circumstances.
Using an A7rIII with AFS, AF in Focus Mag - on. Flexible Spot:S. Shooting at f2. Silent shooting.
Procedure: Spot AF on defined edge, magnify to 12.4X and AF again to see if focus shifts.
At distances less than approximately 8 feet, the focus will shift slightly to the front. Within 4 feet, it is quite noticeable.
At further distances there appears to be no focus shift.
Note that the initial Spot AF appeared correctly focused at all distances.
I visually looked into the front of lens at these different distances and as a possible coincidence, the aperture blades are closing down within these shorter distances.
Shooting at f2.8 has similar focus results to a lesser degree, increase in depth of field possibly masking it. At f4 the effect is very, very minimal.
My Eye-AF tests (with different settings) were limited and inconclusive yet initial impressions are mixed results, at least under 8 feet distance. Which is unfortunate.
I’ll be able to shoot some more in the next few days and experiment with the Eye-AF more.
Edit: There is no focus shift from min focus distance to about 1 foot working distance. So the problem area is from about one foot to 8 feet out.
Do not know if this correlates direclty to the Eye-AF focus shift issue.
My initial tests are showing the AF front focusing issue similar to as described by others here, in certain circumstances.
Using an A7rIII with AFS, AF in Focus Mag - on. Flexible Spot:S. Shooting at f2. Silent shooting.
Procedure: Spot AF on defined edge, magnify to 12.4X and AF again to see if focus shifts.
At distances less than approximately 8 feet, the focus will shift slightly to the front. Within 4 feet, it is quite noticeable.
At further distances there appears to be no focus shift.
Note that the initial Spot AF appeared correctly focused at all distances.
I visually looked into the front of lens at these different distances and as a possible coincidence, the aperture blades are closing down within these shorter distances.
Shooting at f2.8 has similar focus results to a lesser degree, increase in depth of field possibly masking it. At f4 the effect is very, very minimal.
My Eye-AF tests (with different settings) were limited and inconclusive yet initial impressions are mixed results, at least under 8 feet distance. Which is unfortunate.
I’ll be able to shoot some more in the next few days and experiment with the Eye-AF more.
