Free......

shad309 · Joined: 08 Mar 2008 Posts: 453 Location: Illinois, USA

I have a Zeiss Pro-Tessar 35mm f4 (unsure what mount- it's small bayonet). The focus ring spins freely and the glass has some rainbow looking stuff around edges (maybe oil???). Comes with original Zeiss Ikon plastic bubble case.
If you want it, just pay for shipping and it's yours. First come first served Laughing

Can post pics tonight if you want to see it.

Flor27 · Joined: 13 Sep 2007 Posts: 1195 Location: Paris, France

Pro-Tessar lenses are for movie cameras Wink

Indeed, nice offer !

bob955i · Joined: 15 Apr 2007 Posts: 2495

I think you'll find they're for the Contaflex.

shad309 · Joined: 08 Mar 2008 Posts: 453 Location: Illinois, USA

I was thinking Contaflex since the bubble says Zeiss Ikon

luisalegria · Expire: 2018-01-18

Yes, this sounds like the front lens components for the Contaflex.

I have a Contaflex, but unfortunately it is the Pantar version, which has its own lenses.

shad309 · Joined: 08 Mar 2008 Posts: 453 Location: Illinois, USA

rainbow edges- oil????

Abbazz · Joined: 23 Jun 2007 Posts: 1098 Location: Jakarta

Katastrofo · Expire: 2013-11-19

I have a Contaflex IV which could use this lens, but Sebastien just gave
the pronouncement of death. Sad

Thanks for offering,

Bill

Richard_D · Joined: 21 Oct 2007 Posts: 2378 Location: Faversham Kent UK

Lens separation looks worse than it's optical influence and won't spread like the dreaded fungus.....................

IvanJ · Joined: 28 Jan 2008 Posts: 34 Location: Serbia

rick_oleson · Posted: Thu Mar 20, 2008 2:02 am Post subject:

What you're seeing around the edges is the reflection off the surface of the glass where the cement has failed. Where the elements are bonded together there is no (or more correctly, a tremendously reduced) reflection. But the reflection represents only about 4% of the light per surface, so with 2 exposed surfaces it's reflecting 8%. The remaining 92% comes through unchanged, and that difference is not enough for the film to detect. The 8% reflection IS, however, enough to cause flare when shooting against the light.

There is no real fix that I know of for this cement failure, as the cement cannot be softened by any normal means. However, I and a number of other people have successfully made the symptoms disappear by wicking thin oil into the gap. Like the cement, the oil has a refractive index similar to glass, and where it flows in, the reflections disappear and the lens becomes cosmetically and optically perfect again. Such a lens is not repaired in the proper sense of the word, and should not be sold as anything other than what it is.... but the treatment will last for years, and can be repeated if necessary; and I consider an optically and cosmetically perfect lens to be superior either to one with separation or to one that has been destroyed in a failed attempt to recement it.