Klimsch Apo Ronar lens designation question

nigma97 · May 3, 2016

What means the „L“ or „S“ in the name of some Klimsch Apo-Ronar lenses?
There are also some focal lengths without an additional letter in the name, are these predecessors?

For example,
Klimsch Apo-Ronar L 240mm or
Klimsch Apo-Ronar S 800mm or
Klimsch Apo-Ronar 480mm (without additional letter)

regards

chrisaisenbrey · May 3, 2016

Well for Apo-ronar sold directly by Rodenstock there exists a CL version with linarized aperture. Probably this is the Klimsch L version.

Rodenstock also made a CLM version with minimal distortion at a certain reproduction scale and there is a 6 element ronar for the longer wavelengths. Not sure which corresponds to Klimsch S.

Dan Fromm · May 3, 2016

In Rodenstock parlance, "L" = linearized aperture. "CL" = linearized aperture with lens elements cemented to the barrel.

nigma97 · May 4, 2016

Thank you for your answers.
L for linearized seems logic.

Now the remaining question is, what means the "S"', could it be this is a sort of CLM lens? I'm not sure about this.

europanorama · May 20, 2016

Is it on the lens? S is maybe in Sinar-lens-board

nigma97 · May 20, 2016

europanorama said:
Is it on the lens? S is maybe in Sinar-lens-board

Yes it is on the lens, the lens is without shutter or lensboard.

AgX · May 20, 2016

Dan Fromm said:
In Rodenstock parlance, ... "CL" = linearized aperture with lens elements cemented to the barrel.

Never heard of such cementing. What was the idea behind that?

Cementing in the meaning of locking ring + glue? Or just glued to the barrel?
I mean, a locking ring helps in centering.

Dan Fromm · May 20, 2016

This link http://www.largeformatphotography.info/forum/showthread.php?8432-APO-Ronar-vs-APO-Ronar-CL is the first hit returned by a Google search for "Apo-Ronar CL"

You're getting lazy in your old age.

AgX · May 21, 2016

Rodenstock:

"In the Apo-Ronar series designated as "CL" the lens elements are adjusted within the barrel by autocollimation and then casted force-fit within the barrel by means of suited resin."

What most probably means locking the traditional way plus added glue. The sketches show locking rings, and are stated to be applicable for the plain- and CL-versions.

(Dan, thank you for that link. The old fart actually has an Rodenstock Apo-Ronar (CL) catalogue in his archive, but it does not say a word about that fixing, not even about that designation. So I thought it not much sense searching the net, but hoped for your old man's wisdom...)

Klimsch Apo Ronar lens designation question

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