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06-25-2011, 06:51 PM - 1 Like   #1
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my focus rig

Testing out the focus fine adjustment on my K5. Rig with high-precision optical table components seems to work pretty well. I notice some dependence on the lighting type and intensity and repeatability after far-focusing. Tried to get the best compromise and not let OCD get the best of me.

Any tips/techniques to share?

Here are my current settings:

FA31: 0
FA43: -3
DA15: +2
DA18-135: +2

rgk



06-25-2011, 07:01 PM   #2
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Nice set-up thanks for sharing.
06-25-2011, 09:33 PM   #3
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Linear stage FTW?
06-25-2011, 10:03 PM   #4
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Very nice set up.

06-25-2011, 10:03 PM   #5
rgk
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Yep, pair of rescued linear stages. I think I'm going to rotate the one holding the chart so that I can autofocus on the center and evaluate focus on the same center, as opposed to autofocus center and evaluate edge. I'll do the stage move between button press and exposure (2sec.).

rgk
06-25-2011, 11:17 PM   #6
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AF test at such close distance is a waste of time.
06-26-2011, 02:27 AM   #7
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QuoteOriginally posted by wlachan Quote
AF test at such close distance is a waste of time.
When I noticed that I realized its likely just set that close to show the setup. But I have read the same stuff about minimum distance to do focus corrections.

Of course my setup is the opposite side of the universe from RGK's very organized and precise looking test bed. I usually just find a spot on some otherwise feature-less concrete and shoot spot at a 45 angle while kneeling to adjust an inch up or back. Justification is I try to test and alight everything in the same light and stability I use it for real. I could be right...or just lazy.
06-26-2011, 12:04 PM   #8
rgk
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Yeah, I pushed things together to get a pic, but I was using a pretty close focus distance, say under 24". I could get about 6' on my table, or much longer with some creativity. Will use these tests to supplement real-world use.

Background here is that I was noticing some minor focus issues and became aware of the fine focus adjust feature on my new K5. Too cool to resist. Tested out the folded paper Bourque method, but thought I could take it up a notch pretty easily. Will keep experimenting and appreciate any suggestions on technique/setup/patterns.

rgk

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