I bought a Hexanon 2.8/100 today in near perfect condition,except the focus barrel has a slight side-to-side movement,which does not seem to affect focusing.Up and down is ok,no movement.I pulled back the rubber but could find no screws.Any suggestions?I have done many repairs and adjustments before,but I hope any hints would speed up the process.Thank you.

-- Anonymous, December 09, 2000

Answers

loose focusing barrel

Hi Manuel,

I haven't experienced that with my 100, but have with other Konica lenses. Most require you remove the trim ring that threads in where the filters fit, with most lenses it's the part that has the lens focal length, filter size, etc. labeled on it.

The best way to do this is with a "lens wrench", that is actually made from gummy rubber, looks kind of like one of those rubber floor protecters you put under the leg of a chair. Actually, I've used the floor protecters to do the job, with a little trimming and scooping out with a Dremel tool to clear the front element of the lens. www.micro-tools.com sells lens wrenches and probably would have a picture of one. With any of these, you have to be careful not to scratch the front element, of course.

Once you have the trim ring out, you should be able to see three screws back past the front elements toward the middle of the lens. They are pretty good sized with flat heads that clamp down on a ridge and hold the focusing ring in place. With a long thin screwdriver it's possible to retighten them. If I recall, it's a straight screw (not cross-point). This worked for me on a 50/1.4 and a 35/2. I'm still trying to figure out a similar problem with a 135/3.2, if anyone has any suggestions!

Hope this helps.

Alan Myers

-- Anonymous, December 09, 2000

loose focusing barrel,hexanon 100mm

Thanks for your help,Alan.Worked perfectly

-- Anonymous, December 13, 2000