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Your Own Mamiya Flat Top
I keep receiving mail from photographers wanting to make a "Mamiya Flat Top". I have much more experience with Mamiya since I made the first Flat Top and I have edited the information to reflect the new experience and knowledge.
Make Your Own
Standard 23 Nicer
The 50mm and 75mm Mamiya lenses don't have notches for the Standard lens mount latch but the notch is easily cut in with a Dremel tool with 5/32 cylindrical rock. The Universal doesn't use a latch.
Cut, shape and finish a 1/16" aluminum cover. The aluminum can be found in all good hardware stores and cut with hacksaw. Use soft jaws or cardboard in the vice. Clamp the finished cover in exact position and drill four #43 (4-40 tap drill) holes in the cover and down through the top of the body. Holes should be close to the edge and avoid existing holes in the body. Position where ever convenient. Tap the body holes #4-40 and counter sink the cover holes.
With a Graflex roll holder on this body with the top lowered 1 3/4" inches or so, the finder must be mounted slightly to the rear so one can get an eye to it. If used with Mamiya roll film holder this may not be necessary and you can mount shoe at rear of cover.
Cut and dress a 1/8" x 3/4" x 1 1/2" aluminum bar. Mount the shoe square 1/16" from the rear end of the bar. (Really square.) Mount the bar square (Really square.) to the aluminum cover with 3 or 4 #4-40 flat head machine screws. Check drill and nut clearance.
Viewfinder on the Camera
I use this hybrid with the 65mm Mamiya and a Koni-Omega 60mm finder and the 50mm Mamiya with matching finder. With a couple of the Horseman true 6x9 or 2 1/4" x 3 1/4" roll film holders this camera and either lens arrangement makes a great wide angle outfit. Unlike the Graflex XLS and XLSW with Graflex lens arrangements, the Mamiya lenses have good distance and and hyperfocal scales.
To tell the truth I like the less expensive 65mm arrangement best even though it is older and inconvenient to operate with a proper lens hood in place. The 50mm on the 2 1/4" x 3 1/4" Horseman format is serious wide, about 80 degrees of view. The 75mm Mamiya is a later lens with a circle of coverage large enough to cover the 4x5 or 6x12 format. See: Mamiya 4x5x6x12 Ultrawide.