[dkpentax]

I got a 1000mm F:8 k-mount lens recently that has a broken screw for the camera rotation feature. the screw is not attached to the lens mount anymore, and I am not sure exactly how this one works, it seems like it is different Han the similar screws on the 1000mm Reflex, and the 1000mm Takumar version doesn't have a screw like it.
I have looked at the screw I have, and it is hollow inside, with a tiny spring inside it, which I suppose must have had something to do with a ball bearing or something that made the click-lock work every 90 degrees.
The screw I have does not screw it, and I am guessing but I think the black ring underneath the knurled gripping edge is supposed to be attached to the mount, and not stuck to the screw, but that's the info I can't confirm without having a working 1000mm lens.
can someone post some closeups of the screw and what it looks like tightened and extended. Also, if it doesn't involve breaking the lens, what happens if you completely unscrew the screw, and what is inside it or underneath it.

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Last edited by dkpentax; 06-22-2021 at 08:25 PM. Reason: title was wrong

[dkpentax]

I chanced that the black ring stuck on the screw was unscrewable, and got it loose with a wood clamp. so that let the screw screw back in to the mount and then the screw now goes in and out as it should. that just leaves the question of what is missing from inside the screw.

[vonBaloney]

What are we looking at here exactly? This is the mount section of the 1000mm Reflex 6x7? (Might wanna update the post title -- it says "100mm") Which has been converted to K-mount? (It doesn't look like the native K-mount 1000mm f11)

This one:

https://www.pentaxforums.com/lensreviews/SMC-Pentax-Reflex-Takumar-67-1000mm-F8-Lens.html

Or something else?

[dkpentax]

What are we looking at here exactly? This is the mount section of the 1000mm Reflex 6x7? (Might wanna update the post title -- it says "100mm") Which has been converted to K-mount? (It doesn't look like the native K-mount 1000mm f11)

This one:

S-M-C Reflex-Takumar 6x7 1000mm F8 Reviews - 67 Telephoto Primes - Pentax Lens Reviews & Lens Database

Or something else?

yes, fixed title. 1000mm not 100mm. I don't have a 6x7 1000mm to compare the mount to.

[vonBaloney]

Oh, I'm sorry, I was stuck on the idea that this was a mirror lens since you mentioned the Reflex, so I was just trying to figure out which lens it was. So this the mount for the massive 1000mm f8, right? Not a lens I've ever had my hands on, so can't help too much. There is a similar screw on the rotating tripod mount ring of my A*600mm f/5.6, and it simply loosens to a point but does not come off so I'm not going to force it. (btw, the title didn't change in the list view of the forum -- maybe you can't edit that or an admin has to do it.)

[dkpentax]

the black ring that appears as though it is part of the mount is actually a hollow screw that is screwed into the mount, and the screw the user turns to lock and unlock the rotation feature is screwed into that. but mine was unscrewed completely at some point, and an unknown part was lost from underneath the screw that actually ran in a groove in the mount, which was what made the click effect when it turns.

I tried updating the thread title but on the main entry page it still says 100 instead of 1000