Jupiter-8 aperature issue

[Apostata]

Hello all,

So, I'm shooting my first test roll on my Zorki-4, and I've noticed that the aperature ring on my Jupiter-8 won't turn all the way to f22. It will only (and firmly) stop just past f16. Can I assume that I'd need to disassemble the lens in order to rectify this? Anyone else have this issue?

Cheers,

Matt

 

[kiev4a]

Good point greyhoundman. If it stops at f2 the lens isn't stopping down all the way. If it goes past the f2 setting the ring is out of whack.

 

[Apostata]

It's possible it has been apart and the ring was set wrong. There are 3 small gib screws that hold the ring in position.

Do the marks line up when you turn it to the f2 mark?

A good observation, and yes - the ring does turn past the f2 mark. Would this mean that I would need to loosen the 3 screws and re-set the dial...or is it infinitely more complicated than that (which is usually the case with cameras)?

Cheers,

Matt

 

[reagan]

...turn until mark lines up with f22.

Right, with the "f22 mark," which in the case of at least two of my J8s, the f22 mark isn't exactly under the 22.

Just a note.

 

[reagan]

They never are. 🙂 You wouldn't want it to be that easy, would you?🙂

Really. If it was, I'd be chasing something else. Anyway, I mentioned that because somewhere in my first couple of rolls with my first FSUer w/J8, I noticed that "...my aperture ring doesn't go all the way to f22." After adjusting my bifocals a bit, I realized, oh, it's not supposed to. 🙄

 

[Apostata]

Turn the ring toward f22. When it stops, loosen screws and turn until mark lines up with f22. Tighten screws carefully so as not to disturb the ring.

Be sure to use a screwdriver that fits the screw slots exactly. And don't tighten too much. The slots are brittle.

Thanks greyhound. As per CV's addition, I will make sure it's 'on the mark' rather than just on the number. Luckily, I have a mini-screwdriver set.

M

 

[Apostata]

Grrr...my smallest 'precision' screwdriver (0.9mm) is tauntingly just a hair wide for the nut. Seeing as I got the set in a dollar-store, this shouldn't be much surprise.

 

[captainslack]

Grrr...my smallest 'precision' screwdriver (0.9mm) is tauntingly just a hair wide for the nut. Seeing as I got the set in a dollar-store, this shouldn't be much surprise.

Sears has a nice set of Craftsman mini-screwdrivers for $20. That's what I bought to work on my cameras and they've been great.

 

[Apostata]

Sears has a nice set of Craftsman mini-screwdrivers for $20. That's what I bought to work on my cameras and they've been great.

Cool - I'll keep that in mind. Would you be familiar with the size of screw-head you're using on your lens?

Thanks!

 

[wyk_penguin]

Grrr...my smallest 'precision' screwdriver (0.9mm) is tauntingly just a hair wide for the nut. Seeing as I got the set in a dollar-store, this shouldn't be much surprise.

If they don't fit, my solution consists of a file, and some patience.

 

[Apostata]

Update: so I attempted this a few days ago with a proper screwdriver. A small disaster, partly of my own doing. Firstly, the chief problem: after turning it as far as it would go to f22, I loosened the screws , turned the aperature ring to the proper f22 setting and tightened the screws again. Contrary to the desired result, what this did was make the aperature out by the same degree as before, but only in the opposite direction (ie whereas before it would stop a bit before f22, now it stops a bit *after* f22).

The second problem, the 'my own doing' part, is that - when I tried this again (or for the third time, I can't remember) - I loosened one of the three screws too far and it fell out, bouncing brilliantly on my nice hard desk, and fell to the floor. And I can't find it. The other screws are tight enough that I don't feel any give on the aperature ring as a result of missing the third screw, but needless to say I was a little angry at myself for not having a cloth on the work-table to avoid such a scenario. If I can't find the missing screw, there should be a place in town where I can nab another (grrr).

Ironically, my test roll on the Zorki-4 is great. I'll post some examples when I get a moment to do some scanning.

 

[jdos2]

(HINT: a very strong magnet, like you might find if you disassemble that 540MB fixed disk you have laying around from 1994, will find that screw in SECONDS, along with other sturm and drang)