I believe that Pentax has had (at least) four "refconverter" models, the two
similar Refconverter and Refconverter-II finders, followed by the two similar
Refconverter-M and Refconverter-A finders, as follows: (Were there others?)
I believe the M fits and also maybe the "A" fits Olympus.
The newest is the Refconverter-A, and it appears to be a modified
Refconverter-M (with a slightly larger field of view inside the eyepiece, in
order to more easily see the "out of the way" aperture and shutter finder
window info in such bodies as the Super Program (Program A).
The Refconverter-M was designed for the M bodies, and (like the Refconverter-
A) has two magnifications (1x and 2x) to help with precise focusing. The
Refconverter-M produces a non-reversed image, to facilitate reading the
numbers in M body finder windows.
I believe that the Refconverter-II was designed with the KX in mind, being the
first to produce a laterally correct image, for easily reading numbers in the
finder window. Unlike the newer finder models, there is no variable
magnification option. Like the Refconverter-A and Refconverter-M, though, the
"II" has a variable diopter adjustment to aid in critical focusing.
The "Refconverter-I" (called, of course, simply the "Refconverter" - <g>) was
used with K bodies that do not have any numbers or letters in the finder
window, since the image produced is a mirror image. (I do not know if this
finder, or any possible previous model, was available in the screw mount body
era.) Like the other Pentax finders, the "I" does have a variable diopter
adjustment.
Warren
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