Focusing ring failure Hexanon 50mm 1.7 - Help & Advice please!

More likely the "tang" inside that holds alignment, has probably come loose. It is held in place by 2 tiny screws. It is easy to check. Remove the 4 screws that hold the base in place. CAREFULLY lift off while holding lens base up. The tang is brass colored. there are two brass colored pieces. The bigger and closser to the open end is NOT the one. It is the smaller one 180 degrees and deeper. If screws are missing, they will be loose in this space and may be hiding stuck in some greese.

I have disassembled and cleaned mine. But at that level you have to take the helical apart, and it is very difficult getting it in the right thread when reassembling. I don't want to do it again. But for checking your problem, you only have to pull the base plate and look. Easy.

If that is your problem you will have to realign the tang with a wide grove in the outer barrell.

Hope this helps.

 

Great lens and quite easy to disassemble but be careful and notice everything about the alignment of the plates as you take it apart... do it in a tray too.

 

I have two of the 50mm 1.7 hexanon ar lenses. the one I'm looking at does not have screws or holes under the focusing ring rubber grip. Are there more than one version of these lenses? But if you have holes without screws it might be time to contact seller, OR use the lense for further education. I sometimes do that.
I'm sorry not to be more help. But it sounds as though you are better equiped with instructions for maintaince, than I am.

 

I have two Hexanon's for my GH1. I'm keeping this page and the link (from pdh) just in case.

Good luck with your repair effort.

Alan

 

Try screwing a tiny spare screw into one of those empty holes and see if the internals move when you turn it. Have a few goes : nothing will harm and it might solve your problem.
Those grub screws are very very easy to lose : they look like bits of dirt when they fall on the floor.

 

I took a photo when I was making a new part for my Hexanon.
your slider for the focus thingy is here ;

It holds everything in line while the helix moves the lens body in and out.
The big silver back and little black back plates are off...

( On my lens someone had fudged up the aperture lever connections : I ripped them out and made my own. The debris from various meddlings is visible on the picture.)

 

It looks to me that you do have the brass slidey thingy : just above centre on the right of your picture : about three growth-rings out from the glass.  
So your focus problem seems not to be a missing/loose brass slidey thingy.

But your lens looks unlike my lens ... so showing bits of mine probably can't help you further.
To help identify your lens please write the words on the front (or post another nice piccy). Some expert might see it and say "Ah yes, the second-half of 1971 lenses made in Yokohama Koki 13 have a bio-degradeable plug widget" or some such.

Mine says "KONICA HEXANON AR 50mm F1.7 LENS MADE IN JAPAN 55@"
(It's not an @ its a crossed zero ...)

 

Never mind the ratchet.
you see the little brass thing just higher than centre, 3 'rings' out from the lens.
That is probably (more pics) the locator brass thingy that slides in and out keeping everything from rotating as the focus is turned...
If that isn't fixed with two screws on its bast then that'd be the problem. Focus the front away from the back and have another look.
Also, try screwing three tiny screws into the focus ring empty holes so they grip the interior : never mind lack of evidence therin. It might just work.

Mine cost me £8.27 with Autoreflex body and a nice brochure. Result!