Mamiya RB67 lens 180mm F/4.5 click sound

[John Ng]

Hi,

I'm new to the RB67 system, which I bought last month, and new to the forum, but have been learning a lot here on the forums since joining.

I just purchased a 180mm f/4.5 form KEH rated "Excellent." I haven't tested it with film yet, but will this weekend.

In the meantime, I was testing the sound of the shutter through various shutter speeds. I didn't do any scientific test, but the 1 second shutter has the 1 sec delay, and the shutter was faster as I went form 1/15 sec to 1/8 to 125 sec, etc. So that was "normal" for an unscientific test, but I noticed there's a "click" at the very end which I thought was normal after every speed. Then occasionally at 1/400, there would be no click, but mostly there would be a click like all other speeds.

Here's a DropBox link to sounds at 1/400 sec, 1 with the click at the end and without.
https://www.dropbox.com/sh/15391h8aqbguljw/AADPI_ngWD6MHCfq9YUy4gspa?dl=0

Not sure if this is something should be concerned with.

Thanks,
John

 

[gdavis]

Take the lens off the camera and fire it. Most of what you're hearing is the mirror slap in the body.
Only remove the lens when the camera is cocked.
There is a little button on the lens, hold it in while rotating the two pins clockwise to fire the shutter.
To re-cock the lens off the camera, rotate the pins counter clockwise.

The late click at the fast speed doesn't sound right, everything should be pretty much instant. But testing it with the lens off should give you a better idea if the lens is working correctly. Also check the mirror lockup and make sure it's in the 'N' position.

 

[John Ng]

Take the lens off the camera and fire it. Most of what you're hearing is the mirror slap in the body.
Only remove the lens when the camera is cocked.
There is a little button on the lens, hold it in while rotating the two pins clockwise to fire the shutter.
To re-cock the lens off the camera, rotate the pins counter clockwise.

The late click at the fast speed doesn't sound right, everything should be pretty much instant. But testing it with the lens off should give you a better idea if the lens is working correctly. Also check the mirror lockup and make sure it's in the 'N' position.

Mirror lockup was on 'N.". The lens sounded better or more "normal" off camera. I then notice something interesting/weird testing and looking into the shutters. There seem 2 layers of shutters, but as I keep firing the shutter, it seem to went back to normal. I attached a couple of pics.

 

[John Ng]

Mirror lockup was on 'N.". The lens sounded better or more "normal" off camera. I then notice something interesting/weird testing and looking into the shutters. There seem 2 layers of shutters, but as I keep firing the shutter, it seem to went back to normal. I attached a couple of pics.

Mirror lockup was on 'N.". The lens sounded better or more "normal" off camera. I then notice something interesting/weird testing and looking into the shutters. There seem 2 layers of shutters, but as I keep firing the shutter, it seem to went back to normal. I attached a couple of pics.

Nevermind on the pics. I realized it's the aperture. Newbie still learning.

 

[gdavis]

Yep, when you cock the lens the shutter and aperture open up so you can see through the lens to compose and focus. When the pins are rotated to fire the shutter, the shutter first closes so the mirror in the body can be flipped up and the aperture closes down based on the aperture setting. As the pins reach the end of their travel, the shutter opens and closes for the duration of the set shutter speed.

 

[Alex Varas]

From my recent experience you should send the shutter to CLA, that sound is when the shutter blade close. If you listen the second you have the same click just before the mirror slaps.
Maybe I'm wrong.

 

[Alan Edward Klein]

Shoot a roll of pictures at different speeds and see what you get.

 

[John Ng]

Shoot a roll of pictures at different speeds and see what you get.

Yes, that's what I'm planning on doing, which is the ultimate test. Thanks!

 

[tomkatf]

Leaf shutter closing down... more noticeable at slower speeds...