APO Ronar questions

[james zhou]

Dear all, Rodenstock APO Ronar lenses have these designations, cl，a，s，sl. Does anyone knows what these means? Thanks! jim

[Bob Salomon]

Cl means equally spaced aperture settings. Most modern ones for photo were cl.

[Dan Fromm]

CL = lens elements cemented in place, linear aperture scale

CLM = lens elements cemented in place, linear aperture scale, intended for making printed circuits, slightly asymmetric, very low distortion at intended reproduction ratio

I'm not sure about S, vaguely recall a six-elements in four groups 800 mm Apo-Ronar S.

[james zhou]

Thank you Bob and Dan, appreciated!