Keebs
If I fire off enough shots, maybe just one of 'em
So I was out and about yesterday and there were a few occasions where I thought my 1DIV couldn't lock focus and I put it down to the dull day and misty air.
However playing around in my back garden this morning I've found this…
I can adjust the diopter to focus the viewfinder with the screen information and then both my eye and the camera agree on the lens AF subsequently produced - all good.
But if I then turn the camera upwards to about 30 degrees or so about 50% of the time the viewfinder suddenly goes completely out of focus, but the AF is still spot on if I take a picture.(So obviously nothing to do with the lens, a 400 5.6) I then have to lower the camera to horizontal and push the focus button a couple of times to bring the viewfinder back into focus. Very strange.
I've tried pushing/jiggling the diopter adjustment dial but cannot reproduce the problem that way, and it is the same with the eyepiece on or off, makes no difference.
It's not my eye moving or eyelashes touching the eyepiece or anything stupid like that.
Any thoughts?
However playing around in my back garden this morning I've found this…
I can adjust the diopter to focus the viewfinder with the screen information and then both my eye and the camera agree on the lens AF subsequently produced - all good.
But if I then turn the camera upwards to about 30 degrees or so about 50% of the time the viewfinder suddenly goes completely out of focus, but the AF is still spot on if I take a picture.(So obviously nothing to do with the lens, a 400 5.6) I then have to lower the camera to horizontal and push the focus button a couple of times to bring the viewfinder back into focus. Very strange.
I've tried pushing/jiggling the diopter adjustment dial but cannot reproduce the problem that way, and it is the same with the eyepiece on or off, makes no difference.
It's not my eye moving or eyelashes touching the eyepiece or anything stupid like that.
Any thoughts?