On 08/04/2011 2:56 PM, Sam L wrote:
Hi all,
I have a K-x that seems to me to always be just a little soft
focusing. I'd like to finally get around to testing it a little
scientifically. To that end I have downloaded the focus charts etc
from
http://regex.info/blog/photo-tech/focus-chart
I know I'm supposed to test using the smallest possible depth of
field. Here are the lenses I can use:
Auto Focus:
DA40
18-50 Kit
50-300 Kit
Is the DA40 adequate for determining the focus accuracy of the AF system?
I also have these MF lenses, but am not sure how to best test out the
MF focus system (which is a combination of me and the camera).
SuperTak 50/1.4
SuperTak 85/1.9
I can't help with the Kx, as I don';t have one, but I would strongly
advise against using any of the focus charts out there in favour of
adjusting the focus against a real world (and real world distance) object.
Unless you are using a flat field lens, (you aren't) a focus chart is
guaranteed to give a false front focus indication.
--
William Robb
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