From: Paul Stenquist
On Feb 25, 2011, at 1:01 PM, steve harley wrote:
On 2011-02-25 05:02 , Paul Stenquist wrote:
There are alternatives that are somewhat easier to use but
more difficult to construct, such as a method where the
target is a slope that rises at 45 degrees and the camera is
level.
easy to construct: i've used a yardstick leaned against a wall,
though only to check lenses, since my k200d doesn't have a focus
correction feature
i guess a yardstick on the ground would be a little easier as i
could raise the tripod to a comfortable height
Or perhaps a yardstick on a table leaned against a wall. But unless
your yardstick has sharp, well defined markings, it might not work
that well. My target is printed on good photo paper with fine lines
at high resolution. That makes it easy to see which line is most in
focus. With wide angles, it can be a close call.
There are several targets available out on the web. You print them on a
laser printer then fold them along the indicated lines and you've got
your 45 deg target. You place the target on a table and your camera on
a tripod.
Here's one I found with a 10 second Google search ...
http://www.k10dbook.com/AFCHART.pdf
An article that tells how to use it with the K20D:
http://www.zimbio.com/Digital+Cameras/articles/839/AF+adjustment+test+chart+help+Pentax+K20D
You'll probably have to cut 'n paste that URL. Here's the TinyURL version:
http://tinyurl.com/6x22z44
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