blp1664886145

Has anyone heard of this company? I have a Coleman-Dynamic Optics 50mm f2.8 lens. Aperture range is 2.8 to 22.

It may perhaps be an enlarging lens. Lens is approximately 2 1/2 inches high, and about the same width. Aperture ring is in front focus ring behind. I have not been able to find anything at all about this lens, I've even contacted a few camera shops who also knew nothing of this lens. I'm at the baffled stage at the moment

 

Thanks in advance for any guidance[/QUOT

This German page shows a photo of what sounds like the same lens in Exakta/Exa mount:

 

Kleines Tessar für die Exa by Photo but More

 

The translation reads: "Less well known - because they are not as common or because of a slightly different design - are other gems from the Far East. The 50 mm f / 2.8 from COLEMAN-DYNAMIC OPTICS from a Japanese manufacturer unknown to me only shows its pedigree in a direct comparison with the Exa-Tessar. It was probably built around 1965/70."

 

I haven't heard of the Coleman-Dynamic name before, but perhaps it was a house brand.

I just took a look and compared my lens to some of the photos on the page and it appears to look very much like the Zeiss Jena ..so it was probably copied by whatever company in Japan

This German page shows a photo of what sounds like the same lens in Exakta/Exa mount:

 

Kleines Tessar für die Exa by Photo but More

 

The translation reads: "Less well known - because they are not as common or because of a slightly different design - are other gems from the Far East. The 50 mm f / 2.8 from COLEMAN-DYNAMIC OPTICS from a Japanese manufacturer unknown to me only shows its pedigree in a direct comparison with the Exa-Tessar. It was probably built around 1965/70."

 

I haven't heard of the Coleman-Dynamic name before, but perhaps it was a house brand.

Thank you .. more than I've been able to find. I'll have to see if an Exacta to E mount will let me mount it and see how it performs .. *if* it still works. However focus and aperture rings work well ...

+1 for Exakta. There should be a small locking pin on the mount flange also. Quite a few Japanese lenses were made in Exakta mount.

Thank you

Exakta? Praktica cameras were produced in bayonet mount from 1979, and this lens would be older than that.

Thank you

The Exakta mount is tiny. Some clue as to its size would help identify it.

it's 37mm across

Has anyone heard of this company? I have a Coleman-Dynamic Optics 50mm f2.8 lens. Aperture range is 2.8 to 22.

It may perhaps be an enlarging lens. Lens is approximately 2 1/2 inches high, and about the same width. Aperture ring is in front focus ring behind. I have not been able to find anything at all about this lens, I've even contacted a few camera shops who also knew nothing of this lens. I'm at the baffled stage at the moment

Thanks in advance for any guidance

It is a Komura 135mm f3.5 lens s/n 512345 which was part of a lot I bought a while ago. Last remaining mount to identify. I think it might be Praktika, but not sure

Thank you in advance for any information