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Here is my experience so far...
I purchased this unit for my ME Super Program many years ago - worked GREAT! with my SMC KA 50mm 1.17 prime lens and TTL flash on a TTL hotshoe extension cable. And all the scales are for either a 50mm or macro 55mm lens on a 35mm film plane.
Enter the digital world... the sensor on my K-r is roughly 3/4 the size of the 35mm film gate. If I use the scales with my trusty 50mm lens, I will (naturally) get about 150% magnifcation, or turned around, only about 75% of the slide I am trying to copy. I am waiting for my P-TTL flash to arrive later this week, so I have no idea how that will work.
With a lot of play, I have got the 50mm lens to about 90% coverage of the slide. The bellows on the front of the lens to the slide is nearly fully extended, and the bellows between the lens and the camera body is fully compressed.
I've also tried my KA 28mm lens, but sadly the fully compressed lens to body bellows is too long. And if I ignore the shortcomings of using a zoom lens, the K-r kit's DAL 18-55 lens is too long, and the lens to slide copier bellows is too short - plus there is no way to manually adjust the lens aperature.
Has anybody out there achieved a full 1:1 copy with their Pentax dSLR? And if so, what did you do?
Jim Johnson