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01-17-2010, 12:34 AM   #31
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QuoteOriginally posted by Lowell Goudge Quote
Steve, I am not an expert on the entire range of pentax cameras, but the issues with shimming, at least to my memory are predominantly when split imaging screens are installed into the cameras using penta mirrors.

If this is incorrect, please correct me on this, but I am not aware of any issues installing split images in the *istD, K10D or K20D. all of which have screens that are physically the same size and are interchangeable between cameras,

my own experience with the Jinfinance screen ordered from e-bay is that the screen performs well and focuses accurately, Darkening occurrs at about F3.5 to F4 if you are off axis, (i.e. not alligned on the view finder) but otherwise is quite useable at F5.6 if you are careful.

With respect to focusing at F5.6 or smaller apertures, this is really only an issue if you focus with M42 lenses stopped down. If you focus wide open and then stop down while in Av mode (so the camera does the metering) there is no problem, and one of the reasons people go for a split image is to use manual focus fast lenses. At least that is my reason. Except for lenses 200mm or longer, do I have any prime lens (K or M42 mount) slower than F2,8 and most are F2 or faster.
Thanks for your insight on the penta-mirror cameras and shims. As for the focus with slower lenses with Optibrite, I was writing specifically about my experience with the DA 18-55/3.5-5.6 kit as well as my M 200/4. I had the non-Optibrite version, but replaced it due to unacceptably dim view with these two lenses. I would expect this to be true of most of the other relatively slow DA lenses as well.

The non-Optibrite screen worked great with my faster M42 and K-mount glass.


01-17-2010, 08:59 AM   #32
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QuoteOriginally posted by Rusty Rat Quote
Whenever I connect my old A series lenses to one of my DSLRs and turn the camera on, it faithfully prompts me to select the focal length of the lens so that it can accommodate the lens to the image stabilization.
Do you enter the focal length as engraved on the lens?

If you multiply the focal length by 1.5 (the "crop factor") it might lead to over-compensation which would make images blurry.
01-18-2010, 03:45 PM   #33
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Yep, enter as marked on the lens.

Cheers, Mike.

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