I read your original post about 3 weeks ago. It had me a little
concerned if I bought ANY used lenses. It so happens that I did buy
a used lens. So what I did and will continue to do in the future is
to attach newly aquired lenses to this old cheap Vivitar 2x
teleconverter that I have. My thinking is, that if it will attach
and remove from this old TC then it will be OK for attaching to the
DS. If a lens that I purchase becomes stuck, like yours did, then I
lose the cheap TC and not the use of the DS. Makes sense to me....
how about you?
Please don't rely on this method, unless you plan to use the teleconverter also. I've posted this before, but will again.
For almost 29 years now I've used a MX body with only a few lenses. One of my beloved lenses is a Vivitar 70-150. It was the poor cousin to the original Series 1 70-210. If you couldn't afford the Series 1, you got the 70-150. It is a great little lens that is relatively fast, extreemly well built, weighs a ton (for its size), and is actually rated qute good optically. The lens was marketed with a "matched multiplier". Basically a 2X teleconverter with the optics matched to the 70-150. You didn't have to purchase the matched multiplier if you did not want it . . . but I did.
Now the problem with the Ds . . .
The first time I tried to mount this lens on my brand new Ds, it would not seat correctly. I suppose I could have forced it, but at $1000, I wasn't going to. Upon close inspection, it has a tab that on most lenses is less than a centimeter in width. On this lens, it runs almost half way around the lens. "Dang!", I thought, "I really love this lens".
Now the funny thing . . . the matched multiplier does not have the large flange. It has the short tab that most Pentax bayonet mount cameras have. No problem mounting the matched multiplier on the Ds. Works as designed.
So, if I want to use my 70-150 on the Ds, I can only use it with its matched multiplier (giving me a 140-300 in the 35mm world or a 210-450 in the digital world).
The moral of this story is to NOT rely on a lens fitting a cheap TC thinking it will mount okay of your expensive Ds if it will mount on the TC. Sometimes, it just won't.
