|
Hi
I think I have observed the same thing. I think it is due to the focusing mechanism moving from 'pushing' the mirror to 'pulling' it. There would be a lag as the mirror is not 'hard locked' to the thread.
I tend to go past good focus come back, then go forward again.
It does make sense to me that a fine focus at the visual back would largely elimanate this shift.
Philip
|