Adjustment of back focus

[salt-sg]

My Angenieux6-80/f1.2 zoom for Beaulieu has the little bit shorter back focus.
So I tried to insert a spacer under the mount.

I found six small screws on the rear end of the lens.
(I had already removed motor unit.)
The three is for the adjustment of the stop position of the C mount screw ring obviously,
and I guessed that the other three screws are for the lock to the lens body.

But I did not loosen the mount ring.

It may be rusted, or it may have the hidden mechanism to disassemble.

I have no idea.
Therefore, I stopped work, in order to avoid breakage of that.

Does someone know the right way to disassemble it?

Regards!

[Nigel]

Whoa, I wish I knew someone in Japan that could help you. I think you might be in over your head. I know I would be. Good Luck and if I hear from anyone that can help you I will pass it on.

[salt-sg]

Thanks, Nigel.
I will shoot with a spacer between the lens and the body for the time being.

[#Pedro]

Hey Salt-sg,
you have the best lens ever made for S8. It?s worth on the market is over USD 1000. Why don?t you spend only some few bucks more to get it adjusted proffesionaly? It?s really not expensive, here I don?t pay more than USD 50 for a columnation adjustment. And only then the lens will show it?s real power.
Even when knowing how the mechanical construction is, you won?t be able to do the job at home, as special optical instruments are needed (colimnator?)
Any repair shop that deals with prof film equipment, 16 & 35 mm, like repair companies located in film studios, can do the yob, because any prof 16 or 35 mm camera lens has to be columnated, too, prior to use it.
Pedro

[salt-sg]

Thanks #Pedro,

It seems that there is only one workshop which adjusts such equipments in Japan.
Therefore I called them, and they presented the cost cheap enough.(about $75)

Since it was the important lens, I should have left to the workshop, from the beginning.