What kind of Mamiya Sekor lense series that suitable for Mamiya Universal Press?

[ORUSHCRUSH]

I would like to know the lens series compatible with Mamiya Universal Press, such as Mamiya Sekor and Sekor-P

 

[campy51]

My Mamiya Super 23 lens which is 100mm f3.5 just says Mamiya-Sekor. They all come with a helical focusing unit. Are you thinking of removing the lens and shutter from it?

 

[Paul Howell]

It can a little complicated. In addition to the Press, Super 23 and Universal Mamiya also used the same basic lens mount and dedicated lens for a polaroid version, those lens will not work on the Press, might work on the Super 23 but will work on Universal. The lens made for the Mamiya 6 and 7 will not work on the Press type cameras. You need to check to make the lens is for Press series, the price for 6 and 7 lenses are going to much higher.

 

[reddesert]

The Mamiya lenses for the Press, Super 23 and Universal are all interchangeable except for maybe the largest telephoto (250/5) that supposedly doesn't fit on the older Press.

I have generally read that the lens mount for the Polaroid 600 SE is deliberately different from the Super 23/Universal and the lenses don't interchange. I've never had a 600 SE to check. Here's a website comparing the two: http://moominsean.blogspot.com/2010/02/mamiya-universal-vs-polaroid-600se.html

I've seen pics of a "Mamiya Sekor P" 75mm and 127mm mounted on a Universal, for example here's one: https://www.ebay.com/itm/134376347955 So my best guess is that Mamiya added the "P" at some point to mean that the lens covered the Polaroid 3x4" format, not that the lens had a 600 SE mount. But I don't know for sure. I think there are also 75mm and 127mm lenses without the P that are identical.

There are Mamiya lenses for the 6, 7, RB67, etc that won't fit of course.

 

[Chuck1]

There is a recessed notch on some (most)press mounts, but I got a 75mm mamiya press lens with a chrome mount without the notch. Most lenses I've seen online have the notch, but a lot of 75mm don't, black or chrome, would either mount on any press type body?
It's not a polaroid mount.

 

[reddesert]

Post a photo of what it looks like. It's not clear where or what the notch is that you are referring to. Do you have a Mamiya Press body or just the lens?

All Mamiya Press lenses fit all Mamiya Press bodies that I know about, with the exception of the 250mm tele and the Polaroid 600SE mount, as I mentioned upthread. I have not noticed any difference between the black and chrome rear rings. Since posting upthread, I think that Polaroid 600SE lenses have a four-claw bayonet mount while Mamiya Press/Super/Universal have three claws, so it should be easy to tell them apart.

 

[Chuck1]

I'll work on posting a photo, I've never had luck resizing the images.
The 250mm also doesn't have the tab (recess in the mount flange) what type of bodies are the 250mm intended for?

 

[MattKing]

I'll work on posting a photo, I've never had luck resizing the images.

Use any standard post processing editor. Resize to 1000 pixels on the long dimension, and save as a jpeg with 80 quality.
Slightly larger files can be made to work, but that "recipe" is the easiest.

 

[xya]

As said, the Mamiya lenses of this system are interchangeable except the 250mm F5 which doesn't fit the Press and the Polaroid lenses do not fit at all. I have made some pages about these Mamiyas https://www.oddcameras.com/mamiya/mamiya_universal.htm if you are interested.

 

[aconbere]

For what it’s worth my 75mm won’t mount to my press bodies.

I’m not entirely sure what fouls it, but there’s a little pin on the mount that isn’t present on any of my other lenses.

The rear element also rubs against the lever to show if the 100mm is retracted.

 

[reddesert]

Curious! Do you mean the older Press bodies and not Super 23? Some of my stuff for this system is packed up now, but I can confirm that:
- my 75mm also has this pin
- there is a hole to accept this pin on the Super 23 and Universal bodies.

I don't have a older Press body at hand to check. But given that to mount a lens on a Press body, you rotate the lens, as opposed to the breechlock, I think it's pretty certain that the pin would not clear the body mount as you rotated the lens.

I don't know if the other larger later lenses (like the 100/2.8, 127, or 250) have this pin. One could probably unscrew it, but also presumably it's there because Mamiya thought the lens was incompatible with the older bodies somehow.

 

[aconbere]

Yeah exactly, the original press body. I don’t even feel super great trying it! The scratch you see on the rear element is from my one attempt

When I was testing here I used a body without the rangefinder and retraction levers.

The 127 does not have this pin I’m not sure if i’ve tried attaching it to the original press but my suspicion is that it would mate fine.

Maybe it’s the size of that rear element, it doesn’t seem to safely fit into the press.

 

[Chuck1]

Xya's link explains iit
I think the 75mm and 250mm were introduced with the super and universal, and weren't back compatable.

 

[honeysukiyama]

For what it’s worth my 75mm won’t mount to my press bodies.

I’m not entirely sure what fouls it, but there’s a little pin on the mount that isn’t present on any of my other lenses.

The rear element also rubs against the lever to show if the 100mm is retracted.

View attachment 379059

My 75mm Mamiya Sekor P lens shows the threaded hole for this screw, but the screw is not there. Without the screw, the lens mounts easily on my Mamiya Press 23. I would simply remove the screw and try mounting it again.

 

[aconbere]

My 75mm Mamiya Sekor P lens shows the threaded hole for this screw, but the screw is not there. Without the screw, the lens mounts easily on my Mamiya Press 23. I would simply remove the screw and try mounting it again.

Does your press 23 have the warning flag for a non-retracted 100mm lens? My lens catches on the lever in the original press body (as well as the screw that I’ll remove for another press body I have where I removed the lever!)

- A

 

[honeysukiyama]

I've noticed my later, black-bodied Mamiya Press P lens doesn't have a notch in the lens mount bayonet to allow the lens release pin to click into place and release via the lens release button located on the lower right corner of the Mamiya Press 23. Earlier chrome lenses have this notch and will click securely into place when mounted. Apart from this notch, the bayonet mounts appear identical.
I read somewhere this is how later Mamiya Universal lenses mount – without a release tab. They simply twist into place, which seems bonkers since they can just as easily twist out of place when using controls like the aperture or shutter ring. Can anyone confirm if this is how the Universal mount is designed to work, or is there a release tab? Has anyone tried filing out a notch on a later black lens to have it mount securely on an earlier Mamiya body?

 

[aconbere]

I've noticed my later, black-bodied Mamiya Press P lens doesn't have a notch in the lens mount bayonet to allow the lens release pin to click into place and release via the lens release button located on the lower right corner of the Mamiya Press 23. Earlier chrome lenses have this notch and will click securely into place when mounted. Apart from this notch, the bayonet mounts appear identical.
I read somewhere this is how later Mamiya Universal lenses mount – without a release tab. They simply twist into place, which seems bonkers since they can just as easily twist out of place when using controls like the aperture or shutter ring. Can anyone confirm if this is how the Universal mount is designed to work, or is there a release tab? Has anyone tried filing out a notch on a later black lens to have it mount securely on an earlier Mamiya body?

My later model 100, 127, and 50mm lenses all lock into the older press bodies and have the notch. The 75 does not have the notch (but see above for other issues I’ve had with it mounting)

 

[honeysukiyama]

Does your press 23 have the warning flag for a non-retracted 100mm lens? My lens catches on the lever in the original press body (as well as the screw that I’ll remove for another press body I have where I removed the lever!)

- A

No, I don't think it does. The Press 23 is designed to work with the standard 90mm f/3.5 lens either in the normal position or collapsed to allow movements on the back of the camera via a ground-glass screen. The rear element of the 75mm is roughly the same diameter as the collapsed rear ring of the 90mm (and probably 100mm) so it would likely throw that flag. I suspect the flag is simply there to prevent people mounting lenses in collapsed mode and wondering why they don't focus. In which case it the lever could likely be removed without issue (other than perhaps resale value) providing you're aware of the existence of collapsible lenses and know to extend them to normal position.
EDIT: Apologies, yes it does seem to have that lever

 

[honeysukiyama]

Does your press 23 have the warning flag for a non-retracted 100mm lens? My lens catches on the lever in the original press body (as well as the screw that I’ll remove for another press body I have where I removed the lever!)

- A

So yes, my Press 23 does have that lever. When the 90mm is retracted it throws a flag in place of the rangefinder patch, which makes sense since it is designed to be focused via the ground-glass screen in this mode. The rear element of the 75mm lens clears this lever, but only just. Curiously the 'flattened' part of the rear element doesn't sit square when fully twisted into place. I'm not sure what the idea is behind this squared-off part of the rear element; possibly designed to avoid contact with the rangefinder tab.

 

[aconbere]

So yes, my Press 23 does have that lever. When the 90mm is retracted it throws a flag in place of the rangefinder patch, which makes sense since it is designed to be focused via the ground-glass screen in this mode. The rear element of the 75mm lens clears this lever, but only just. Curiously the 'flattened' part of the rear element doesn't sit square when fully twisted into place. I'm not sure what the idea is behind this squared-off part of the rear element; possibly designed to avoid contact with the rangefinder tab.

On mine the flag lever contacts the rear element glass

 

[honeysukiyama]

That is strange.

 

[reddesert]

I read somewhere this is how later Mamiya Universal lenses mount – without a release tab. They simply twist into place, which seems bonkers since they can just as easily twist out of place when using controls like the aperture or shutter ring. Can anyone confirm if this is how the Universal mount is designed to work, or is there a release tab? Has anyone tried filing out a notch on a later black lens to have it mount securely on an earlier Mamiya body?

On the Mamiya Super 23 and Universal, the lens mount uses a breechlock ring on the body. The lens never rotates at all. You place it on the body with the focus mark at 12 o'clock, and twist the body's lock ring to secure it.

 

[honeysukiyama]

On the Mamiya Super 23 and Universal, the lens mount uses a breechlock ring on the body. The lens never rotates at all. You place it on the body with the focus mark at 12 o'clock, and twist the body's lock ring to secure it.

ThanK you; that explains it.