I tested autofocus and field flatness at f4 and several focal lengths.
Camera on a tripod. Flat field test was a shot of a wooden panel with
grain. The focus adjustment test was done with an 18x 12 print of a
360 dpi scaled target I made in PhotoShop and printed on the R2400 at
highest resolution. I've found that targets downloaded from the web
are so lo-res as to be useless.
The focus field appears to be perfectly flat at 60mm and 250 mm. The
autofocus is very close, so I don't think I'll adjust it. It appeared
to be right on at 60mm and registered a wee bit of front focus at
250mm. I've found that none of my zooms are identical in terms of
focus error at wide and long ends. The 60-250 seems to be the closest
yet. I think I'll go take some pictures.
Paul
On May 14, 2009, at 10:56 AM, David J Brooks wrote:
On Wed, May 13, 2009 at 9:41 PM, paul stenquist <[email protected]
> wrote:
Perhaps I'll even make a few photographs.
Paul
You'd never make it on the pentax forums. More talk all day long, like
AM 640.:-)
Dave
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Documenting Life in Rural Ontario.
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http://brooksinthecountry.blogspot.com/
York Region, Ontario, Canada
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