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Thanks Steven! I have basically no knowledge in large format photography :do you have any link that explain the 1/4 plate thing? I started to look at the articles I've found in this forum, but I...

I'll try to remember this advice ;)

Thanks!

Merci Emmanuel!

Here are the dimensions of my lens:
Mount thread: M68x0.5 mm
Lens hood thread: M61x0.5 mm
Front lens diameter: approx. 52.5 mm
Back lens diameter: approx. 55 mm
Total length: approx.102.3mm

Thank you John

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What was unexpected for me is that the rice writing-serial number is seen twice on the back lenses (inside and outside)

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Hi, I just got a Lerebours & Secretan lens, the serial number is 7492. I got it on a 2nd hand website in France, but I didn't managed to get any informations about this...

Hi all, This is Guillaume from France. I decided to join this very useful forum after being a long time collector of vintage russian lenses. Now I started to collect a few large format vintage lenses...