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- 587
- Name
- Andy
- Edit My Images
- Yes
I recently took some shots shot of a racer friend on his bike and a lot are soft. I had the centre AF point selected and focussed on his eyes, recomposed the shot keeping the shutter button half pressed and took the picture. This is a crop (not 100%) of the resulting shot with my standard sharpening applied.
A you can see his face is soft but his leathers at the elbow are sharp. When I was going through them later I thought that maybe this was a problem with the lens front focussing so I did lots of tests with all my lenses on a tripod covering a wide range of apertures and focal lengths. All the shots were sharp and with the sort of DoF I would have expected. I have a shot of the rider facing directly and again his face is soft but his leather are sharp where I recoposed the centre AF point to.
My camera is a 40D and the lens is a Ef24-70 F2.8l and I haven't changed any of the settings to alter the way the shutter works with AF so it shouldn't re-focus when I recompose the shot. I have tested again with recomposition and two shots out of a dozen or so are the same as above, it only happens when recomposing.
According to dofmaster.com my DoF for this shot should be around 1ft so if the lens was front focussing it must be doing it by quite some way, and why doesn't it do it on shots when I don't recompose.
Anyone experienced this before ? could the UV filter and the bright conditions have caused this ? I am hoping it's user error but I can think what I did any different on these shots than I do normally.
Confused of Lincolnshire ...
A you can see his face is soft but his leathers at the elbow are sharp. When I was going through them later I thought that maybe this was a problem with the lens front focussing so I did lots of tests with all my lenses on a tripod covering a wide range of apertures and focal lengths. All the shots were sharp and with the sort of DoF I would have expected. I have a shot of the rider facing directly and again his face is soft but his leather are sharp where I recoposed the centre AF point to.
My camera is a 40D and the lens is a Ef24-70 F2.8l and I haven't changed any of the settings to alter the way the shutter works with AF so it shouldn't re-focus when I recompose the shot. I have tested again with recomposition and two shots out of a dozen or so are the same as above, it only happens when recomposing.
According to dofmaster.com my DoF for this shot should be around 1ft so if the lens was front focussing it must be doing it by quite some way, and why doesn't it do it on shots when I don't recompose.
Anyone experienced this before ? could the UV filter and the bright conditions have caused this ? I am hoping it's user error but I can think what I did any different on these shots than I do normally.
Confused of Lincolnshire ...