M-position not working on RB67 lens

Vonder · Jan 27, 2015

This is the 50mm f4.5 lens. Seems to work fine except when in "M" position - the shutter opens up wide when you press the shutter button (to normally lock up the mirror) and just stays open. I don't have a manual or instructions for this lens, so I am wondering if I missed a key setting or someone knows what might be wrong.

Or the name of a good repair guy.

ic-racer · Jan 27, 2015

Turn it back to "N" or use a screw-in cable release to release the shutter one the mirror is up.

Alan Klein · Jan 27, 2015

+1
M is for Manual. I always use this position to reduce camera shake when on a tripod. Once the mirror "slaps" up, I wait a couple of seconds for the camera shake to go away. Then I release the shutter using a cable release screwed into the N/M dial. You might want to get the manual here. http://www.butkus.org/chinon/mamiya.htm Note there are different RB67 models.

Vonder · Jan 28, 2015

M is for mirror lockup. It's supposed to open the shutter via attached cable release once the other shutter button, the one on the body of the camera, has been pressed to bring the mirror up. If the lens switch is in the "N" position and you press the body' shutter button the mirror swings up and it takes the picture all in one action.

mopar_guy · Jan 28, 2015

It should be pointed out that some of the older lenses also have sync switch to select 'X' sync or 'M' sync to use flash bulbs. This has nothing to do with the mirror lock-up feature that others have mentioned.

John Koehrer · Jan 28, 2015

You need a dual cable release to raise the mirror, then trip the shutter. One won't do it.
The stroke on one of the cables is adjustable so you can synchronize them. IE:mirror raise, shutter trip.
You get very thin negatives if it's shutter first.

Or use two releases one for body, one for lens.

M Carter · Jan 28, 2015

John Koehrer said:
You need a dual cable release to raise the mirror, then trip the shutter. One won't do it.
The stroke on one of the cables is adjustable so you can synchronize them. IE:mirror raise, shutter trip.
You get very thin negatives if it's shutter first.

Or use two releases one for body, one for lens.

In my experience, you only need one - you can trip the mirror with the shutter button, and then hit the release.

Had a shoot once where my cable release failed - I recall tripping the lens with a paperclip so actually, you don't even need one!

John Koehrer · Jan 29, 2015

^^^Yes, you can do it any way you choose.
If you want to do it in one action though. There's only one way to do it.

Yes I've done it all three ways.

You can use Canon, Minolta, Olympus Duals too. Nikon & Leica use an internal thread system

M-position not working on RB67 lens

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