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jucytec wrote:
Confirmed. All my lenses can be excited with my A7RM3 as well...
Easier to reproduce at Minimal Focal Distance...
How I've been able to reproduce it.
1. Find a subject with high contrast. My subject was coiled black phone cord on top of a white desk.
2. Focus Small Flexible Spot on an area where top half is black and bottom half is white within the focus area.
3. Holding AF-C will end up pulsating as it is thrown into confusion between black and white. I'm using back button focus
I've tested this on the following lenses and they all pulsate like a college girl on ecstasy.
1. 70-200 GM
2. 24-70 GM
3. 85 1.4 GM
4. 35 Z 1.4 Distogon.
This issue does not happen on my A6500.
While I recognize this is an odd issue which can be reproduced reliably, I'm not too concerned in real world shooting situations where this would make me miss a shot. it's rare for me to use small AF points since I typically used them for Eyes back in my canon days. I'd add that if I focus on the black cord it focuses fast AF.
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This reminds me of Canon Continuous drive mode. If you focus on static subjects (emphasis is "static"), it pumps back and forth (the algorithm seems to expect a moving subject and can't deal with a non-moving one properly), so you can get slightly OOF images, unless you use AF-S. Changing the AF sensitivity helps a bit, alternatively one only needs to press the focus button for a very short time.
With Nikon or the Sonys I used and use so far (D7100, D610, D750, D810, A7ii, A7rii, now A9) this doesn't and didn't happen. As I prefer using back button focus and AFC all the time, I would think hard about buying an A7riii unless this is resolved.
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