DGC1 Offline Upload & Sell: Off
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From naturescapes.net:
1. Set up a high contrast focus target. The downloadable and printable target for the FoCal AF software (which I don't currently recommend) is a great target for this purpose. Print it, or another target and tape it to a perfectly vertical surface such as a wall. Now perfectly align the camera both in height and tilt to the target so that the sensor is perfectly parallel to the camera's sensor. You can also utilize the LensAlign II target if you own this as it has a simple to use target alignment system. The camera should be about 25 times the focal length away from the target for general use or at the distance that you do your shooting at if you are in a controlled environment such as a studio.
2. Now put the camera in live view and focus the image with the focus target in the center. Now initiate the auto AF Fine Tune system by hitting the Focus selection button on the lower left of the lens mount (with you standing behind the camera) and the movie record button (small red button next to the shutter button) simultaneously and hold until the screen asks you to confirm that the camera is steady. Select yes and a value will be entered in the AF Fine Tune table. Now go to the AF Fine Tune menu item at the bottom of the first page of the Tools Menu (wrench icon), make sure that AF Fine Tune is set to On and then read out the value that was entered in the Saved Value item. Write this value down.
3. Repeat the same procedure as in number 2 above 9 more times for a total of 10 samples. Write all of them down.
4. Now cross out the lowest value (the most negative if a negative number) and the highest number (the least negative number if the highest number is also negative) to get rid of any weird outliers. Next, take an average of the remaining 8 values by adding them up and dividing by 8. Round this to the nearest whole number and enter this value in the Saved Value line item of the AF Fine Tune menu.
5. Repeat the above for every lens and every lens/teleconverter option. On zoom lenses, use a focal length at or near the longest focal length unless you do not use your lens at that focal length.
Here is an example of a 200-400 f/4G lens that I just fine tuned on a D500. I first manually did it and came up with a value of -2. The following AF Fine Tune values were obtained using the auto AF Fine Tune procedure 10 times:
-1, +3, -3, -2, -2, -3, -4, -1, -5, -1, -3
Throwing out the highest and lowest values (+3 and -5) and then averaging the rest gives a result of -2.37. Rounding that to the nearest integer, you get a value of -2 which is identical to the value I came up with. - See more at: https://www.naturescapes.net/forums/viewtopic.php?f=57&t=263680#sthash.95LTtTdn.dpuf
Haven't tried it yet, please report your experiences.
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