Black button on exakta66 2.8/80?

[buerokratiehasser]

It is, most probably, a Biotar. Nice lens nevertheless.

However there is a black button like thing under the aperture scale (about one inch wide and a quarter to a third inch high)
Can be pressed, comes back

Seems to do nothing?

Aperture preview is via Arsat-style silver lever elsewhere.

[Attila]

Biometar lens , can you show a picture to us?

[buerokratiehasser]

right now only this

http://www.pentaconsix.com/80mm.htm

the lens would be #4 from left (most probably)
can't see button on these -
unless rear view at 12 o clock

shooting button closing pins?
But the pins are said to be for aperture

[buerokratiehasser]

Oh yeah, next question.
Why does my Flektogon 50 (1059...) have these same "Exakta pins" on it?
GDR did not foresee Exakta66 I am sure.

Someone modified it? But are they operational at all?
It gets curiouser and curiouser.

[buerokratiehasser]

Mystery solved, it is the Exakta66 preset-aperture cam/pin, see

http://www.pentaconsix.com/e66ttl.htm
("A" arrow)

That seems to be a great site btw.


Now what these little "pins" in the rear of these lenses (near the big aperture auto pin) do? Maybe just fabrication artefacts?

http://www.ebay.com/itm/MC-Flektogon-4-50-Zeiss-Pentacon-six-Kiev-Exakta66-case-/230622270007

It looks just like this, even the case does