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Diy pentamirror blueprint

Started Apr 1, 2019 | Discussions thread
OP Baynatives New Member • Posts: 5
Re: Diy pentamirror blueprint

Thanks, I see now how that reflex viewer idea works with one more mirror and a viewfinder. I've actually seen it on a medium format camera once briefly but didn't put the pieces together. i was thinking about putting the extra mirror in front of the lens, which didn't work but now I see the mirror goes behind the focusing screen with an added viewfinder lens. The viewfinder lens is another flip to correct for upside down which was left out in the configuration with the added mirror in front, between the lens and subject. I will be setting up something like that in the future. That's great how it eliminates the need for a black cloth over your head.

Without that revelation, I went ahead with the opaque white 'movie' projection screen option instead of ground glass. Viewing by eye is awkward but set a cell phone on the peep hole and it works great. The tilt/shift/marionette focusing mechanism also works flawlessly and intuitively: https://photos.google.com/photo/AF1QipN0eIik_m1aGV1iBaMMEOtVcaxgPwnJvcpAl2cU

All that remains is to run a cable around the top of the box with a clamp lever arm to lock in the 3-D marionette focusing system ropes. Tightening the cable will push down spring loaded brakes to set all 4 rope locations - simple solution.

Note in the video that one of the ropes would have been right in the middle of the lens view so it had to be re-routed with pulleys on a plywood U-shaped frame.

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