Lens caps for Caltar-II-N 5.6/180mm

[Aender Brepsom]

Hello,

can anybody who owns (or knows about) a Caltar-II-N 5.6/180mm or a Sironar-N 5.6/180mm please help me with this:

Having a 58mm filter diameter, I suppose the front cell takes a 60mm push on lens cap, right?
What is the size of the rear element i.e. what size would the push on cap need to be?

Thank you very much.

Aender

[Ralph Barker]

The best method is to actually measure your lens, using a vernier or dial caliper. Inexpensive ones are available in the $10-$15 range, and are useful tools in your LF kit.

[Oren Grad]

FWIW, Rodenstock specified a 60mm front cap and 51mm rear cap for the 180 Apo-Sironar-N. So far as I know, there wasn't any change in these dimensions with the transition from Sironar-N to Apo-Sironar-N; I hope Bob Salomon can correct if I'm wrong about that.

[Aender Brepsom]

The best method is to actually measure your lens, using a vernier or dial caliper. Inexpensive ones are available in the $10-$15 range, and are useful tools in your LF kit.

Thank you, Ralph. Yes, of course, but I don't have the lens yet.

Thank you too, Oren. My guess was 51mm for the rear element, but I wanted to be sure before ordering any caps.

Cheers

Aender

[Bob Salomon]

Front is 60mm rear is 51mm. Both Linos and Kaiser make these size caps.