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

[ridax]

Your description most probably suggests a modified Petzval type.

But with the lens in your hands, why not to try it - at least looking at the image on the ground glass only - instead of asking questions to the people that do not have the lens? :)

[Ron (Netherlands)]

Nice find. Here's one on the ICA projector for which it was apparently made (a forerunner was the projector made by Hüttig which sported the same lens - see last pic below, it was apparently the lowest class/cheapest lens which could be chosen for this projector):

https://i.ebayimg.com/images/g/FZkAAOSwsNBbinGD/s-l1600.jpg

https://i.ebayimg.com/images/g/QyoAAOSw8b9binG4/s-l1600.jpg

and another configuration ....

https://live.staticflickr.com/7221/7296767816_093e1d5179_k.jpg

https://kadeboeken.nl/wp-content/uploads/2017/05/m9004a.jpg

[ljherrero]

Thanks for the info; Apparently this objective had a long life in ICA: here ( https://www.ebay.es/itm/123729228613?hash=item1cced63345:g:FZkAAOSwsNBbinGD ) one that should be something more recent, but with coal arc light ...

Here ( https://www.optical-toys.com/files/Dokumente/AAA%20-%20Kataloge/Catalogue%20-%20ICA%20-%20German%20-%201911%20-%20Excerpt.pdf ) information similar to what your appointments, from an ICA catalog of 1911.

[ninadobrev]

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? contexto (https://contexto-wordle.com/)

Thanks
The Ica Niklas lens you recently purchased appears to be a vintage ICA lens produced in the 1920s. Your research indicates that the lens is made up of a front cemented doublet, three rear elements, and a diaphragm slot, totaling five elements in four groups. The estimated focal length is 165mm (6 1/2 inches), which corresponds to an aperture of about f/3.5 or f/4.

[ljherrero]

Thanks for the reply. I disassembled the lens components to try to clean them (accumulated dust) and I was able to verify that, indeed, there are five elements in four groups ( http://forum.mflenses.com/ica-niklas-t83588.html )