Info on Sironar-N MC 210mm f5.6

[brucep]

I don't appear to be able to find any data on this lens. Can anyone point me at historic Rodenstock data or tell me what it's coverage circle is?

Many thanks

[Cletus]

Looks like Rodenstock says IC is 301mm @ f22 for this lens.

Here's the table I got it from....

http://www.prograf.ru/rodenstock/largeformat_en.html

[brucep]

Thanks for that, but that refers to the Apo version, whereas mine is the earlier non-apo version. Did the apo version change specs of the IC?

[Leigh]

The Sironar-N was identified in the literature as an apo design before that was added to the barrel imprint.
The change seems to have been a marketing decision in response to Schneider's use of the Apo designation on their lenses.

Quoting from a Berkey Marketing brochure ©1982:
"Above all, the Sironar-N offers a degree of color fidelity normally found only in apochromatic lenses."
The same brochure describes this series as being:
"... in a new compact design with multi-coating for improved color rendition, contrast, and a maximum aperture of f5.6"

This appears to be your lens, with an Angle of View of 72° and an IC of 301mm, both @ f/22.

There is a later version of the 210/5.6 Apo-Sironar-N, having an IC of 316mm. It appears on a (relatively) recent
Linos datasheet, which shows only 150mm and 210mm FLs in the series, implying that it was being phased out
in favor of the more recent Apo-Sironar-S product line.


- Leigh

[Scott --]

I have this lens (the non-APO-branded one) and have used it quite a bit on 5x7 with tons of movements, and a few times on 4x10 with no issues.

[Bob Salomon]

The Rodenstock Precision Optical camera lens brochure from 11/85 states that its image circle at f22 at infinity was 301mm and at f11 it was 276mm. At f22 it covered 72° and at f11 68°. So on 57 at infity at f22 there was 64mm of rise and 53mm of shift in landscape orientation. They don't say a word about APO correction although Berkey wasa bit casual about there claims since they printed their brochures, or most of them, in house in Long Island.

[kleinbatavia]

I use this lens on 5x7 and 4x10 and it works fine...