Put to Use a Mamiya 6 Engineering Sample Lens

[D-Swordfish]

Some time ago, with the plan to acquire a Mamiya 6 at some point, I bought a 150mm Mamiya 6 lens at a very good price. Now, I have a Mamiya 6 and the lens does not fit. It has 7 instead of 8 electric contacts (second image, lens at the bottom). I has "Sample" engraved which is why I believe it is an engineering sample.

I wonder how I can put this lens to use. As a first step it would be great to be able to open the shutter so I can test it. Maybe I could also fit contacts with the correct pinout to make it usable on the Mamiya 6.

Does anyone have information on the pinout of Mamiya 6 lenses? How to apply a signal for opening the shutter?

 

[JeffS7444]

If that's a Seiko shutter, I'd expect that cocking and firing it would be via one of the mechanical levers, albeit at a fixed 1/500th second. Other speeds would require use of the internal electromagnets.

 

[D-Swordfish]

If that's a Seiko shutter, I'd expect that cocking and firing it would be via one of the mechanical levers, albeit at a fixed 1/500th second. Other speeds would require use of the internal electromagnets.

There is only one lever on the lens and that seems to be for cocking. Ideally I'd like to trigger the electromagnet for opening the shutter and keep the shutter open so can test the lens. What voltages are usually applied? Is there electronics the shutter or does one directly feed the coils?

 

[JeffS7444]

My experience is with Bronica ETRSi, and IIRC, with those lenses, the same lever is used for both cocking and firing the shutter. No electronics contained in the lens, save for electromagnets. If service literature isn't available for your system, I'd seek out data for aforementioned Bronica ETRSi, SQ, and any other system which used similar shutters.

 

[OlivierAOP]

I believe the shutter is operated by the battery voltage (3V) across two pins. As long as there is voltage the shutter is open. You can try pairs of pins with a voltage source to find them. You can also use a voltmeter on the body and fire the shutter (say at 1s) to find which pins are triggered.