[rollei_list] Bellows on 2.8D?...an answer from Mr Prochnow

Since I couldn't find an explanation on the topic in
Prochnow's Rollei books I decided to ask him directly
to complement the excellent info that Todd gave us
from his experience. While I was writing my previous
post I received Mr Prochnow's answer (My question to
him is bellow):

"Dear Carlos.

??The ring in the back of the lens is like a diaphragm
to save quality in
difficult situations.
It can look different on every  calculation??

Kind regards

Claus"



> Dear Claus:
> ??Finally a technical question, I'd like know the
exact
> task for the fabric (or similar) that you can see
> around the back of the taking lens in the Rolleiflex
> cameras like the 2.8C, D, E, 3.5 and a different
> fabric for the F, it seems a bellow or a seal or a
> trap light or a membrane, what is it?, what it does?
> what could happen if the "fabric" lacks?. I haven't
> see it in the Rolleicord IV?
>
> Best regards
> Carlos




        

        
                
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