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Old Jul 07, 2011, 12:04 PM
ggunners is offline
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Bit-Twiddler and Flyer
USA, VA, Chantilly
Joined Apr 2002
1,796 Posts
Alternate Focus Method

FYI. One way to arrive at best focus that is quantifiable is to use still photos and compare the jpg output file sizes. The largest .jpg file size will be best focus.

How it works. Set your camera up pointing to a typical complex scene. Take a picture, record the lens position. After all photos are shot, write the .jpg file sizes next to the still images. Put the lens position corresponding to the largest .jpg file.

Why this works. The jpg compression tries to group pixels together for higher compression, the more detail you have, the less compression is possible. Consequently, the bigger file is the best focus.

-- ggunners
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