md zoom rokkor 75-200 f4.5, no infinity focus

Helge · Jun 17, 2020

I have this nice condition rokkor 75-200, that amazingly has no zoom creep.
Only trouble is that it doesn’t go to infinity. And it’s not by a little.
Infinity and about 50 meters away is noticeably out of focus in the viewfinder.

It doesn’t appear to have ever been dropped or mistreated.

Any idea what could be wrong?

There is no macro mode to engage and the mount plate appears to be nice and tight.

Anyone ever heard of a similar problem?

halfaman · Jun 18, 2020

I had similar problems in a couple of manual focus lenses, neither of them had apparent damages. Good thing is that any camera repair shop can correct it easily.

Helge · Jun 18, 2020

halfaman said:
I had similar problems in a couple of manual focus lenses, neither of them had apparent damages. Good thing is that any camera repair shop can correct it easily.

So it’s just the helicoid stops that are misplaced?
Any idea of how such a thing can happen?

neilt3 · Jun 18, 2020

Helge said:
So it’s just the helicoid stops that are misplaced?
Any idea of how such a thing can happen?

Someone dismantles it to clean it and puts it together wrong ?
Most helicoids have several start points .
Only one is right .
Get it wrong and it gets thrown out at one end or the other .

md zoom rokkor 75-200 f4.5, no infinity focus

Helge

halfaman

Helge

neilt3

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