summicron 50 help

[alien8]

Not knowing much of anything about lens construction I have an ignorant question to ask. Back in october or november I bought a 50 summicron (4th version, tabbed) from one of our members on the classifieds here. When I received the lens everything looked fine, but when I went to unscrew the attached filter instead of the filter the lens itself start to 'screw apart' somewhere towards the front end of the lens. I quickly rescrewed it very tightly and then was able to unscrew the filter but I now have this nagging feeling that the lens might be damaged. Does this mean that the lens has been decollimated? Should I have someone look at it? Most of my images look good to my eyes, but of course don't have any shots from before I partly unscrewed it, so no way of making any comparison. If anyone can put my mind to rest I'd be much obliged.

thanks,
sean

 

[nickdando]

The lens heads are designed to come apart so that they can be used on a Visoflex. You just need to grab hold of the lens elsewhere to be able to remove the filters.

Nick

 

[alien8]

I was hoping someone would say something like that. Thanks, Nick. 🙂

 

[former member]

Had this happen today. Just screwed it back, and used a rubber sheet to hold the lens in place and take off the filter. This is common.

 

[awilder]

The tabbed Summicron does NOT unscrew for Visoflex. That only applied to the two prior versions: DR/rigid and the black Wetzlar (69'-78'). The tabbed version was never designed to do that and should be carefully screwed back together.

 

[Shac]

The 4th version will unscrew but it's not meant to be used for anything like a visoflex or the close-focus adapter. I have a late German model that unscrews. Just unscrew the filter, screw the lens heqad back on and take care.