wolfpacktx
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krementz wrote:
I finally got around to micro adjusting the focus, mostly out of curiosity.
I had always been disappointed with my 85/1.8, but I assumed it operator error, bad conditions, etc. It took a -20 adjustment. WOW!. Can't wait until tomorrow to try it out. My other lenses varied from spot on to +10.
Is there any way of reviewing the adjustments without putting on the specific lens? I connected to the computer, but the Canon utility doesn't seem to have any way of accessing the microadjust info.
I am using a 50D and a Mac.
Can you share with us how you did the adjustment?
I have tried Micro Focus Adjustment on 1D3, and even open a thread for questions. Tried few appoaches recommended by FMers. But I still could not get the adjustment right. Finally, I tried the following(seems giving me the best results):
1) Test under day light (backyard, driveway, etc)
2) Use low ISO, wide open aperture, turn off IS from the lens if applicable
3) Set your tripod away at least the target by 50 x focal length. For example, 50mm lens you will shoot from 50x50= 2500mm = 2.5m (about 8.2 feet)
4) The target should be flat and parallel to the camera's focal plane, and should be centered with respect to the picture area. Tape a small mirror at the center of target, if you can see the camera and lens from the view finder, you are OK. Otherwise you need to move the tripod left/right, and adjust the hight
5) Set the lens for AF and the camera for One-Shot AF, and manually select the center focusing point
6) Use a remote switch and/or the camera's self-timer to release the shutter. Use mirror lock when taking shots
7) Manually set the focus on the lens to infinity
8) Half press the shutter, so the AF is in action
9) Switch to Live View and set the lens to MF
10) Fine turn the focus at 10x (or 5x)
11) Turn off Live View, switch to AF
12) Half press the shutter, if no movement in the distance scale window, you are good to go, no microadjustment needed
13) If the distance scale moves, then perform microadjustment.
14) Try -5 or +5 setting, then repeat step 7) to 13) until you observe no movement of scale window after achiving the best focus in Live View
15) Take few shots using the best microadjustment point you just found, then take some from +1, +2, +3, -1, -2, -3 (based on the best adjustment point you identify from 7) to 14). For example, if you find the microadjustment at +5 works the best, take photos at +5, +6, +7, +8, +4, +3, +2.
16) Reivew the photos on computer at 100%. The sharpest one should give you the best microadjustment point.
The above steps are based on this:
http://forums.dpreview.com/forums/read.asp?forum=1032&message=30318334
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. Thanks for the information.