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I purchased a STI Stiletto focuser for 35mm film camera (Pentax K1000) around 18 months ago from the US. They're excellent knife edge focusers, but found it a little difficult to initially calibrated. You need to precisely measure the focal plane of the 35mm body and tweak the Stiletto focuser accordingly. I found it frustating as with most old 35mm cameras the film back plate is on a spring to keep sufficient pressure on the film. Any pressure placed on this plate would change the measurement.
I never used it for DSLR or CCD as I personally believe these are best focused with computer software using FWHM calculations or the like. I subsequently sold it as I found I wasn't using it much due to computer assisted focusing.
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