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07-08-2009, 03:30 PM   #1
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Split Focusing Screen and AF Adjust (BF/FF)

Have many of you used the "cheap" jinfinance focusing screens to adjust FF/BF for your lenses - especially on K20D? Did you find it useful/successful? What method did you use to determine the adjustment increments?

Would love to hear from others about this ...

07-08-2009, 03:32 PM   #2
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I would think that without any scale to set the focus correctly you would be lost.

you need an image, where the camera focuses what it thinks is correct, and a scale showing where correct focus actually is relative to what the camera thinks,

this is why people play with these focusing charts in the first place.
07-08-2009, 04:59 PM   #3
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I have used my the split image viewfinder on my Ricoh XR7 to adjust the infinity focus on the Zenitar 16/2.8. Does that count?

Steve
07-10-2009, 10:45 AM   #4
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any others that have tried it?

07-10-2009, 02:25 PM   #5
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I have a K2000 and several manual focus old K mount lenses, I found if difficult to focus with the stock screen and purchased a China split image screen. Install was a cake walk. I did have to play with the shims, adding one of the two supplied with the brass stock shim. I used a 4' scale and focused on the center to check all the lenses. I could not get the 135mm to focus correctly. The 50, 35-70 and 70-200 all work quite well. None of this affects the auto focus system on the kit lens, it too is accurate (checked with the split image and photo of the scale.
07-10-2009, 03:09 PM   #6
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I have the Katz Eye, not the jinfinance one. But once I got my screen installed and working properly, the AF BF/FF adjustments became a lot easier, because I could tell from looking at the split prism whether it AF'd correctly or in front or behind of the target, by the way in which the target was split by the prism.

When I bought the DA*55, I nailed the AF adjustment in just a couple minutes, without having to remove the SDHC card and pop into the computer, etc....

If you get your split screen adjusted correctly, it makes everything else a lot easier. But sometimes that in itself is a lot of work!
07-11-2009, 03:55 PM   #7
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I also bought the split screen from jinfinance and as he states in his auctions you don't need shims to make them fit.
So I mounted my A 1.7/50 set aperture to f/1.7 took a picture and reviewed it - focus spot on.

As you have said, calibrating AF lenses is easy because you can tell by the split prism.
Before I had this screen I thought both my 18-55 and 55-300 needed a -8 correction when they really needed -2 (if not less).
So a split prism screen really helps - for everything.
07-11-2009, 11:31 PM   #8
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Thanks for the feedback, everyone. I can't wait for the screen to get here already

07-12-2009, 03:09 AM   #9
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My screen from ebay has a really light BF problem (like 1-2mm I'd say). But I think my body moving is much more of a problem than the screen
08-04-2009, 03:45 PM   #10
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QuoteOriginally posted by Egg Salad Quote
[FONT="Tahoma"][SIZE="2"]
As you have said, calibrating AF lenses is easy because you can tell by the split prism.
I'm confused. Pretty much all my lenses are MF. Is it possible/necessary to make BF/FF adjustments for them on a K20D?
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