Rotar 135mm 4.5 FC lens, contax or exakta mount?

Field

Member
Joined
Dec 4, 2011
Messages
150
Anyone ever heard of one of these? I can't figure it out. It has three wings, so not M bayonet mount. Not sure what it is exactly.

When you focus the entire front of the lens elements, as 12 blade aperature (4.5-22) seem to move all at once. It is old, black, brassing. It has a metal gray hood that says "lens made in france" but may not be original.

Any ideas? It is rather small, I thought C-mount maybe. I don't have any pictures (yet).
 
OP
OP

Field

Member
Joined
Dec 4, 2011
Messages
150
Hood has nothing to do with it, it was made in Japan.

It is TINY as you can see, for 135mm it is itsy bitsy sized.
 

StephanA

Member
Joined
Mar 12, 2011
Messages
8
Location
Boca Raton,
Format
35mm RF
Having owned both Exaktas and Contaxes, I can definitely say that it is an Exakta mount. Contax mounts have a reverse external bayonet pattern with an internal bayonet that activates the rangefinder mechanism. This also has the screw (pin) outside the bayonet that the clip on an Exakta will snag to lock the lens in the correct position.
 
OP
OP

Field

Member
Joined
Dec 4, 2011
Messages
150
The size of it though, can it cover a 35mm film plane?
 

Wade D

Member
Joined
Feb 15, 2006
Messages
897
Location
Jamul, CA
Format
Multi Format
It does look like an Exakta mount. Not all that small for an older 135 lens. I have an old Vivitar 135 for my Exakta that is about that size. Should cover 35mm no problem.
 

Rol_Lei Nut

Member
Joined
Jul 2, 2006
Messages
1,108
Location
Hamburg
Format
Multi Format
As mentioned, it's not really that small.
Remember, it's a f/4.5 and there are no auto-diaphragm mechanisms involved.
I have several lenses of that type of around the same size, so it is very likely that it is designed for and covers 24x36mm (also given its Exakta mount).
 
OP
OP

Field

Member
Joined
Dec 4, 2011
Messages
150
I don't get the impression that it splits. Also the construction is pretty different, even if the elements were the same.

How does your Tamron perform?
 

Ian Grant

Subscriber
Joined
Aug 2, 2004
Messages
23,271
Location
West Midland
Format
Multi Format
Field said:
I don't get the impression that it splits. Also the construction is pretty different, even if the elements were the same.

How does your Tamron perform?
Click to expand...

The Tamron takes an inter changable mount, possibly a T mount and the converter goes between the mount and the lens. I acquired it in a job lot of darkroom equipment about 11 years ago and haven't actually used it I only acquired an Exacta

Actually to overall construction and dimensions are very similar bar the T mount but then there were a lot of similar lenses from about the mid 30's until the 1960's when faster telephoto lenses became far more common.

Ian
 
You must log in or register to reply here.
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…