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p.1 #4 · p.1 #4 · 24-70 II near MFD focus shift f/2.8 vs stopped down? | |
Mike K wrote:
One thing was not clear, you were using Live View 10X then you had to be manual focusing at f2.8? Then when you shot (from Live view) at a smaller aperture (4-5.6) there was focus shift? So you are not talking about AF using LV Quick or LV Live? AF using LV Quick is affected by micro adjust setting while LV Live is not. LV Live simply optimizes sensor contrast in the magnify area.
You checked this by using LV at f2.8, mf followed by use of DOF button the stop down. Are you sure it was not just greater DOF where you has the view on magnify?
This behavior happened at which zoom position, and at very close distances? Does it behave this way at all zoom positions at MFD? Does it also happen with normal AF & LV Live AF?
Mike K
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I was shooting quite close, relatively close to MFD. I haven't tried anything like this at longer distances. I forget the exact zoom positions, I think more middle to long end, although I did mess around with some close, wide shots too. Haven't tested it out much. It was just something I noticed.
It was nothing to do with getting more DOF. I'd focus on, say, an eye (and this was a static scenario, camera fixed on tripod) with LV at f/2.8 and DOF would be dead centered around the eye and it would look sharp. Hit the remote shutter release. Inspect results. Blurry, OOF.
Then I tried hitting DOF button while focusing and as soon as I'd hit it I'd see the focus plane shift. If I focused it on the eye at f/2.8, as soon as I hit DOF button, despite more DOF, the eye would go OOF. If I then re-focused while holding it down, centered about the eye then the final shot would maintain focus on the eye.
Edited on Dec 28, 2012 at 09:47 PM · View previous versions
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