Re: Is this Fungus ? I canīt identify, need help
Yes, regluing will solve it, but something this minor doesn't qualify as a practical problem. It may remain steady like this for years. I'd be especially careful to avoid temperature shocks, though, like leaving the camera bag in a car trunk.
This doesn't look like a balsam separation. I doubt even wide open something this minor would have an effect. I have a few Protars I have not fixed yet, and ring of crystallized brown balsam extends a couple cm into the lens. Stopped down, the lenses work fine. Compared to that, this is nothing. You'd be going to a lot of trouble to fix something that is merely cosmetic, but if that is very important to you, it can be fixed. Getting a lens like this apart, glued with what I assume is an older synthetic glue, can be a challenge. If the individual pieces of glass don't have identical diameters, you can add centering issues to your trouble.
Re: Is this Fungus ? I canīt identify, need help
Quote:
Originally Posted by
Kevin Crisp
Yes, regluing will solve it, but something this minor doesn't qualify as a practical problem. It may remain steady like this for years. I'd be especially careful to avoid temperature shocks, though, like leaving the camera bag in a car trunk.
This doesn't look like a balsam separation. I doubt even wide open something this minor would have an effect. I have a few Protars I have not fixed yet, and ring of crystallized brown balsam extends a couple cm into the lens. Stopped down, the lenses work fine. Compared to that, this is nothing. You'd be going to a lot of trouble to fix something that is merely cosmetic, but if that is very important to you, it can be fixed. Getting a lens like this, glued with what I assume is an older synthetic glue, can be a challenge.
Okay, that sounds good. This heavy lens should be just living in a studio, so I think there should be no problem with that, thanks :)
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Re: Is this Fungus ? I canīt identify, need help
A separation, cleaning and re balsaming will work perfectly, but really this so minor that I wouldnt bother.
Here is a similar example - found on EBay!
Re: Is this Fungus ? I canīt identify, need help
That is not balsam separation in my opinion. The pattern plus the rainbow suggest a more modern cement.
Re: Is this Fungus ? I canīt identify, need help
It’s adhesive failure in the doublet, ie “balsam separation” although this lens is too new to have used balsam. This is what failure of modern adhesive looks like. I’d bet it wasn’t originally cured properly.