Summar nickel?

[alex_m3_1959]

So recently i bought a Summar with a leica iii, and i found out that exists a version in nickel but i couldn't find anywhere information about this.

The serial number on my Summar is 249571, anyone knows if this is the standard or the nickel version?

Thanks

 

[Dwig]

There are some six variants of the Summar with both nickle and chrome versions of the rigid mount and of the later collapsible mount. There is also a black rim version and the collapsibles exist with and without the f/2.9 tick mark needed by an antique Agfa color process.

My edition of Lager doesn't have any info on serial number ranges of the variants.

 

[HuubL]

That's supposedly a lens made in 1935. That's relatively early for a Summar and I guess it could be a nickel version. Nickel looks much "yellower" than chrome. Compare it to a later chrome lens and you'll know what you have.

 

[alex_m3_1959]

I ve looked very carefully to summar in nickel and looks alike them, but im not sure.

 

[Thomas78]

There are some six variants of the Summar with both nickle and chrome versions of the rigid mount and of the later collapsible mount. There is also a black rim version and the collapsibles exist with and without the f/2.9 tick mark needed by an antique Agfa color process.

My edition of Lager doesn't have any info on serial number ranges of the variants.

What is the story of the f/2.9 aperture and the antique Agfa colour process?

I realised it before but thought it was a f/2.8 mark which would give - together with the full aperture at f/2.0 - two "international" apertures on the otherwise german aperture scale...

 

[Dwig]

What is the story of the f/2.9 aperture and the antique Agfa colour process? ...

The antique Agfa process was a "lenticular" process. The film was a single emulsion B&W reversal film that had an embossed lenticular surface. You had to shoot through a color separation filter and prism lens attachment. The attachment was designed to work with a 50mm lens at the one special aperture. Since alignment is critical (prism facets exactly parallel to the lenticular ridges on the film) the lens barrel can't rotate when focused, hence the "new" non-rotating barrel was developed for the Summitar.

The film was processed as a positive and projected using a projector with a matching filter/prism attachment. Leitz also offered an appropriate attachment for its then current projector.

The process only lasted a couple of years before it was overshadowed by Kodak's release of the first modern integrated color film, Kodachrome. It was one of many, many short lived and mostly forgotten color processes that were marketed during the last half century B.K. (Before Kodachrome).