I measured the register in the a7r2 and the a7r and found a difference of .30mm over an average of 10 measurements on each camera.
I used a digital caliper and measured against a stainless steel rule placed across the flange in approximately the center of the sensor. I have no bench so the variations are probably due to differences in angle front to back and less from side to side if at all.
My measurements were as follows:
a7r2
15.76
15.84
15.78
15.80
15.78
15.76
15.81
15.74
15.77
15.73
--------
157.77/10 = 15.78 rounded up median 15.77
For the A7r
15.47
15.41
15.48
15.44
15.55
15.56
15.41
15.56
15.48
15.58
-------
154.94/10 = 15.49 rounded down median= 15.48
Trying to measure around the a7r2 sensor resulted in much more widely varying values even though stabilization was turned off and the camera was turned on to \"stabilize\" the sensor. I really wonder how well the sensor is aligned when stabilization is turned off.
My personal opinion is that there is a difference in register. I\'d like to know where the a6300 is with regards to these two values.
I regret not having followed this up when I first found it but now that others are finding problems quite possibly originating from this same difference it might be time to do carefully controlled tests. Perhaps Roger Cicala could be enticed into having a closer look. I suspect that with his optical bench checking register on the two cameras would be both simpler and a lot more accurate.
Apr 30, 2016 at 09:45 PM
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