You can use the 90 degree periscope finder with the DF (or other Mamiya/Phase).
As far as I'm concerned a waist level finder would be welcome but including it in a camera design creates it's own issues of tolerances, dust, longevity etc. I'm not saying I don't think it would be worth it, but bare in mind the number of users of waist level finders is a pretty small part of the already small MF market. If you own a DF and a back then you can use that same DF with an RZ Pro IID with it's gorgeous extra-large waist level finder (or the normal finder).
Doug Peterson
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its not about whether someone uses the feature or not, its the "idea" of solving a problem that everyone wants. otherwise people wouldn't be driving around the suburbs in new 4X4's that have never touched the mud.
if it helps anyone take a shot that they wouldn't otherwise be able get, then its worth it. everybody had waist level finders a few years ago, even if they didn't use them much, when you did need them they were absolutely indispensable. its also something that you have up your sleeve as a "pro" feature that canon doesn't have canon (theres not many).
have you ever actually used a 90degree eye piece thing? ive tried canon ones and mamiya ones and they are so bloody hard to see through, basically useless. dark and weirdly magnified, nothing like looking at any waist finder. whats the big deal about making it? contax has it, hy6, hassy, rz, they all have them, and nobody complains about tolerances or sealing. even the old mamiya m645 had it. i honestly think its the cheap ass designers of the original afd doing a cost- effectiveness analysis of it, and saying they will save $100 per camera if they design it this way. i think the camera are throwing away money with not being able to sell more "add ons" to their system. i remember in the old days when you bought a camera, you bought all sorts of viewfinders, waist level finders, "speed finders", all bits to help the company make profit.
paul