speedmaster20d Offline Upload & Sell: On
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Hi,
A micro-adjustment of +/-1 will not make any difference in the AF accuracy, it is somewhat meaningless as the tolerance of the system is more than 1 unit. To see a meaningful difference you need a value of at least 5 ore more, with smaller values you are just seeing run-to-run noise. The AF system is not perfect and will always show some variation.
As the example above, I am not what can be concluded from it. The subject is too small, doesn't fully fill the AF sensor and is too close to a contrasty BG, it all looks sharp (or sharpened) to my eye and the focus is certainly not several inches away. You need to put your rig on a stable tripod and shoot a larger target placed at 45 degrees relative to the back of the camera so that you can reliably produce and measure a consistent focus shift.... I think your camera and lens are just fine.
I never use mode 3 for IS, the main purpose of IS for HH photography is to stabilize your finder when tracking BIF so mode 3 defeats this purpose (finder remains shaky as IS activates only when you fully press the shutter). I always used mode 2 IS
Hope this helps
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