Checking focus with OM Workspace

[Trevor Carpenter]

Using OM Workspace and its AF function to see how much on target my Auto Focus is on some small birds against blue skies, virtually every picture shows the AF slightly away from the subject and on blue sky. Double checking against larger subjects where I appear to have achieved sharp focus I find that OM Workspace still shows focus on the blue sky just shy of the subject. So is this an OM Workspace issue or is the camera focusing just off target. If the latter how does it achieve focus on a featureless blue sky?|

 

[Guy Parsons]

Using OM Workspace and its AF function to see how much on target my Auto Focus is on some small birds against blue skies, virtually every picture shows the AF slightly away from the subject and on blue sky. Double checking against larger subjects where I appear to have achieved sharp focus I find that OM Workspace still shows focus on the blue sky just shy of the subject. So is this an OM Workspace issue or is the camera focusing just off target. If the latter how does it achieve focus on a featureless blue sky?|

Maybe it's a case of the AF hits the bird but by the time the shot is taken then the bird has moved past the "frozen" AF spot or you have moved a bit or the IBIS has shuffled a bit.

Also try to deliberately AF on some featureless blue sky and see what your camera does and where the AF really settled.

 

[john isaacs]

Using OM Workspace and its AF function to see how much on target my Auto Focus is on some small birds against blue skies, virtually every picture shows the AF slightly away from the subject and on blue sky. Double checking against larger subjects where I appear to have achieved sharp focus I find that OM Workspace still shows focus on the blue sky just shy of the subject. So is this an OM Workspace issue or is the camera focusing just off target. If the latter how does it achieve focus on a featureless blue sky?|

Maybe it's a case of the AF hits the bird but by the time the shot is taken then the bird has moved past the "frozen" AF spot or you have moved a bit or the IBIS has shuffled a bit.

Also try to deliberately AF on some featureless blue sky and see what your camera does and where the AF really settled.

I think it's simply that the subject has moved in the frame between AF lock and image capture. Easy to check; mount the camera on a tripod, lock it down, and see if the AF lock is reported on target. Then pan and see if the AF lock is reported offset from the target in the panning direction only.