ICA Niklas

[ljherrero]

Hi,

 

I have recently acquired an Ica Niklas lens ( https://www.ebay.es/itm/194495742589?hash=item2d48d9827d:g:WOQAAOSw94phiSSs is not this, but identical, although mine has a higher series number), which by the little I have been able to inform me was a lens for a projector of the same firm (ICA) and surely manufactured in the twenties of the last century. The fact is that I have not been able to find almost any information about its characteristics and optical formula except for a reference not very specific at its focal length that would be 6 "1/2 (that is 165mm. Approx.). If that were the focal, the apparent luminosity would be f/3.5 or f/4; as it admits lateral insertion of Waterhouse diaphragms, I have manufactured two of f/5.6 and f/8 (more or less). As something dirty was, I had to dismantle it Its cleaning and I can say that it is composed of a cementad doublet (I think) front and three rear elements and after the diaphragm slot; that is, five elements in four groups (the third and fourth elements next, but not cemented).

 

Can someone give me some information about this lens?

 

Thanks

Edited March 24, 2022 by ljherrero