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01-11-2011, 11:25 AM   #1
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Easy step-by-step test for front/back focusing?

I'm suspicious that my K7 kit lens may have focusing issues... Can someone point me to an easy step-by-step way to test this?

Thanks,

Ken

01-11-2011, 11:30 AM   #2
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Camera on tripod, aimed slightly downward

ruler on table

focus on a mark on the ruler, preferably made with a pen, next to the inch noted

take a picture or two.

look at the pics, see if the mark you selected, and focused on, is the sharpest point of the photo
01-11-2011, 11:35 AM   #3
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Original Poster
at what distance and aperture should you perform this test? And does it matter what zoom your at?

Thanks again,

Ken
01-11-2011, 12:51 PM   #4
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QuoteOriginally posted by Javaslinger Quote
at what distance and aperture should you perform this test? And does it matter what zoom your at?

Thanks again,

Ken
Sorta depends on the lens and the ruler.

Focus effects will be most pronounced wide open, so perhaps the kit lens at 55mm and F5.6, at a pretty shallow angle (try about 15 degrees) to the table.

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