Originally posted by tvdtvdtvd I'm wondering about those two holes in the nameplate ring. Do they look factory drilled, or a bit more rough as if
someone else has drilled into the lens. It could be someone else has already opened the lens and did a poor
job of reassembly. Could be a misaligned/reversed/missing lens element.
I was looking at those also, as I thought about how I might disassemble the lens
... but, I don't know the answer to your question. I'm pretty sure I bought this lens as part of my first "LBA", like 15+ years ago, probably from Ebay (yes, it was around back then), and I'm pretty sure it worked.
BTW, I just noticed something: If I put the lens in non-macro, and the zoom to "70", the lens DOES seem to be focussing! Moving zoom to 28, the lens still does not focus, or at least it doesn't seem to focus (then again, the lens may be so lousy that it's hard to tell if it's focused or not?).
---------- Post added 03-20-16 at 06:12 PM ----------
Originally posted by Paleo Pete I'm wondering if this might be a T mount lens. Does it screw all the way into the threads as it should, or does it stop at about 1 turn?
If it's a T mount, it's the same diameter, 42mm, but different threads, and it also has to be placed about 5/16 inch further from the focal plane of the sensor than a M42 lens. I only have 1, a Lentar 135mm, and I have the T mount adapter that works with it, but if I try to use it as M42, which I tried before I found out it was T mount, it does the same thing. Won't focus, but it won't screw in all the way either.
Hi,
That was ALMOST brilliant
!!
I happen to have a T-PK adapter, because I have a lens (a Soligor 28mm) that is a T-mount lens. So when I saw your post, i got all excited, and I put the "Rony" lens on the T-PK adapter and tried it on my K-x and... it wouldn't focus at all, even at zoom set to 70
...
Sigh ...
Can I summarize at this point... maybe something will "hit":
1) If I put lens into macro mode, it will focus for a specific distance for a specific zoom setting, but if I change distance (but leave zoom alone) it won't focus.
2) It will focus in non-macro mode if zoom is set to 70.
3) In all other cases, it doesn't seem to be able focus and image doesn't change when I move the focus ring.
4) It doesn't seem like it's a T-mount lens.
Does anyone have any other ideas?
Does anyone know how difficult it is to disassemble a lens like this? Also, if I do disassemble it, what do I look for?
Thanks,
Jim
EDIT: I think that I may've figured out what's going on... but this doesn't make sense, to me...
Remember that this is a legacy lens, i.e., originally designed for 35mm film.
The lens shows the minimum distance on the focus scale at 7 feet, but I'm conjecturing that when used with a K-x, that the distances are increased.
In other words, I think that the actual minimum focus distance for this lens, when used with a K-x is probably way, way more than 7' and when i was testing earlier, I was too close to whatever I was testing against, which is why nothing ever seemed to be in focus. I just tested all the way across my house and was able to focus with the zoom set to just under 50.
The thing that doesn't make sense to me is that the minimum focus distance seems to be larger if the zoom is set to a lower number.
Shouldn't it be the opposite of that? Shouldn't a longer lens have a longer minimum focus distance?
Why is this lens behaving the opposite way?