Clark.EE
Well-known
I have just acquired a Mamiya Press (think its a G, early one)
90 3.5 lens. Roll film back & plate focusing back. All for £34.00!
All seems very good apart from the lens!
When you extend it from retracted to "normal" position. It seems very loose. It does not lock in position at all. If you change shutter speed it moves & wants to collapse again.
Should it be doing this?
Whats the "fix"?
90 3.5 lens. Roll film back & plate focusing back. All for £34.00!
All seems very good apart from the lens!
When you extend it from retracted to "normal" position. It seems very loose. It does not lock in position at all. If you change shutter speed it moves & wants to collapse again.
Should it be doing this?
Whats the "fix"?
kuzano
Veteran
I is supposed to turn at both settings
I is supposed to turn at both settings
The lens turns (clockwise if I recall ) at both extended and sunken (so i call it) setting. The sunken setting is to use the bellows on the press cameras that had the bellows mechanism. The normal (extended) setting is the only usable setting for proper focus on the Press models that do NOT have the bellows on the back.
In either event, the lens turns about 4-5 millimeters clockwise to lock into position. The detent that holds the lens stable at either position can be very stiff. I suggest that you are simply not being "manly" enough at locking the lens into position at the outer setting. It will definitely be loose and wiggly if you do not get it over the detent.
Interestingly, with the near complete absence of any sheet film or sheet film holders, I have never used one of these dual position lenses in the depressed position. However, I have purchased a number of them and have gotten them in the depressed position. Once I get them locked in Normal, I never go to the other setting. Admittedly, they have often been difficult to "lock" into the normal position with about a 4/5mm twist in the direction of the arrow next to NORMAL.
If your Press camera body has the bellows with the Graflok film back holders, you will be able to use the Graphic 22 or 23 roll film holders and the bellows, but you will also need a ground glass back for the graflok fixture, and that will be a hunt.
Time to "man up and grow a pair" unless you are the wrong gender. If so, my apologies as that will not be possible!
Get one of those rubber disks that you open Jiff Peanut Butter jars with... Crunchy style.
I is supposed to turn at both settings
The lens turns (clockwise if I recall ) at both extended and sunken (so i call it) setting. The sunken setting is to use the bellows on the press cameras that had the bellows mechanism. The normal (extended) setting is the only usable setting for proper focus on the Press models that do NOT have the bellows on the back.
In either event, the lens turns about 4-5 millimeters clockwise to lock into position. The detent that holds the lens stable at either position can be very stiff. I suggest that you are simply not being "manly" enough at locking the lens into position at the outer setting. It will definitely be loose and wiggly if you do not get it over the detent.
Interestingly, with the near complete absence of any sheet film or sheet film holders, I have never used one of these dual position lenses in the depressed position. However, I have purchased a number of them and have gotten them in the depressed position. Once I get them locked in Normal, I never go to the other setting. Admittedly, they have often been difficult to "lock" into the normal position with about a 4/5mm twist in the direction of the arrow next to NORMAL.
If your Press camera body has the bellows with the Graflok film back holders, you will be able to use the Graphic 22 or 23 roll film holders and the bellows, but you will also need a ground glass back for the graflok fixture, and that will be a hunt.
Time to "man up and grow a pair" unless you are the wrong gender. If so, my apologies as that will not be possible!
Get one of those rubber disks that you open Jiff Peanut Butter jars with... Crunchy style.
Clark.EE
Well-known
Thankyou.
I am 6 feet 3 & 18 stone. I will try harder!
I turns about 10-12mm in the extended position. But does not lock!
I am turning it as hard as i dare. Maybe the bearing/detent is stuck/gummed up? Or someone has had it apart & lost the bearing?
It does have the bellows back, & the ground glass/cut film holder came with it.
Has anyone taken one of these apart?
I am 6 feet 3 & 18 stone. I will try harder!
I turns about 10-12mm in the extended position. But does not lock!
I am turning it as hard as i dare. Maybe the bearing/detent is stuck/gummed up? Or someone has had it apart & lost the bearing?
It does have the bellows back, & the ground glass/cut film holder came with it.
Has anyone taken one of these apart?