Okay, here's what I can show for the moment.
My first exposure, ever, with the Mamiya 6 (it's a folding rangefinder, how hard could it be?).
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Well, aside from keeping the camera level... All of these are on Portra 400 NC that probably expired around 2005, processed in Flexicolor LORR chemistry (replenished color developer).
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Late day -- first of December, give or take, after work, so about 3:45 when sunset is not much after 5:00. Around f/8 and 1/100.
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Last frame on the roll. The big scratch in the middle is on my scanner glass. Once again, late day, early December.
This was 16 frames, masks in. One of the things I like most about the Mamiya 6 -- the versions that had dual format always have the masks, because they're permanently attached. There's either no provision to change the viewfinder format, or I can't see it with my glasses between my eye and the eyepiece, and it's surely possible to set the red window selector mismatched to the frame masks (shoot 12 frames at 6x4.5, or 16 overlapping frames of 6x6) -- but the masks themselves will always be there.
I need to get the camera on a tripod to really see what the lens can do; the shutter speeds only go to 300 (which is probably closer to 200, given this shutter is older than I am), so it's hard to really eliminate motion blur hand held. Also, there's no provision for a strap, unless you have the camera in a case, and the cases are apparently much less common than the cameras.