Re: 220 frame counting

[Greg Erker <erker@xxxxxxxxxxxxxx>]

>What I haven't been able to find (and used to know where it was) is a
>web page that describes the size and interframe spacing of 6x6 and the
>spacing of the numbers on the back of the 120 paper roll.  I'm
>thinking of some camera projects and I'd really like to know where to
>place the red widow for various formats (particularly 6x9, 6x12, and
>6x17).

  I recall John B saying that the 6x6
markings on 120 film are 64mm apart.
Thus for stereo you advance 128mm.

  Based on my Sputnik and Ricohflex
red windows the 6x6 marking is dead
centered over the film gate.

  So this info can be applied to 6x12
also.

  For 6x9 and 6x17 I guess you would
use the 645 markings and I don't know
where those are. A visit to a pro lab
would probably let you get a 120 roll
paper backing from their garbage can.

Greg E.