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[Dsides]

I just got a lens that turned out to be much larger than I expected. I was hoping to use it on a 2x3 speed graphic...
 
The lens reads:
 
Mamiya / Sekor CU  1:1.8  f=75mm CSI3 No. 13690
 
It has aperture settings (eight blades) from f1.8 to

[Msiegel]

In some forums they suspect that CU stands for close up.  
Here a 65mm one
http://arukucamera.net/23CrownGraphicClose-Up.html
Here a Japanese site sorry no idea about the

[Dsides]

Yeah. That's all I could find too. I even poured over images for almost an hour until the search was producing images from people in Viet Nam (where aparently Cu is a word).  ;-)

[Finnegan]

You have one of these too? Mine is a 65mm f5.6 (to f22) in a Copal Press shutter. My lens is small like an Angulon. I have tried to find out more about it but found nothing. Saw one on eBay but no data from the seller. I haven't tried it on a camera yet

[Finnegan]

The lens in the aruku link is the same as mine except for the shutter. Now that I saw the 2nd link I am more sure your lens comes from some industrial type camera. It reminds me of the Wollensak 75mm f1.9 crt lens in Alphax shutter that comes from old osc

[Dsides]

Mine has no shutter - which would be ok with a Graflex Pacemaker, except for the focal distance...
 
I could build a camera around it if it had the shutter!

[Richard1karash]

I have one of these and have been trying for a long time to find anyone else with this lens.
 
I Googled for the same few pages as you, Dsides, I'm pretty sure it is a macro lens.  If we are lucky, it is an oscilloscope lens: fast, high qua

[Richard1karash]

Dsides, what are your other options for a modern general use lens on the baby graphic?