35mm Summicron v4 almost useless wide open

[a.noctilux]

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All is well then.

The rear "inside pattern" post #3 is something to be watched over, if it becomes worse.

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[davorb]

13 minutes ago, a.noctilux said:

All is well then.

The rear "inside pattern" post #3 is something to be watched over, if it becomes worse.

Is there anything I can do about it other than pray?

[Ba Erv]

3 minutes ago, davorb said:

Is there anything I can do about it other than pray?

Call DAG and ask 

[adan]

6 hours ago, Ba Erv said:

Call DAG and ask 

Good idea.

Recementing separated elements is technically possible, but it is about the closest thing to "open-heart surgery" for a lens.

I had a 28mm f/2.8 v.3 of the same design-era (des. 1980, built 1982 by ELCAN) with complete separation (Newton rings in the "new" air gap were visible when looking though the lens). And when I sent it to Leica for 6-bit coding a couple of years ago, they would not touch it at all. Returned with diagnosis of "Balsam-fraktur; no parts available."

I.E. after 32 years, Leica no longer had a complete already-cemented group to simply replace the failed cemented group, and were not going to bother trying to clean the failed cement off my elements and recement them to the necessary tolerances - at least economically. (Kinda too bad, since the lens still performed very well - just a microscopic tilting of the focus plane if doing a "brick-wall" test wide-open. 😰 )

But in that case, the separated elements were a lot smaller and more fiddly (about 1cm diameter).

The Summicron's 5/6 group would be larger and easier to handle. But still tricky to get the optics perfectly centered and with a perfectly even layer of cement.

[AndreasG]

vor 11 Minuten schrieb adan:

(Kinda too bad, since the lens still performed very well

I can confirm this, I bought a new Elmarit 2.8/28 V3 around 1989 and soon after it developed Newton rings when looking through, but I did not care about it and continued to use this lens until today. There is no adverse visible effect on the (technical/optical) quality of my photos.

[Cthulhu]

On 8/15/2022 at 8:02 PM, davorb said:

In the back of the lens I can see some of this on the sides. Is this fungus or separation? Is that's what's causing my issue?

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this absolutely 100% needs to be sent in for service  

 

Edited August 16, 2022 by Cthulhu