Re: beginner's question

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On  8 Jul 97 at 22:58, Jaap Los wrote:

> Re: 70 mm film
> 
> What is the actual negative size of 70 mm IR film? I understand that it
> has 35 mm sprocket holes, the same as 35 mm IR film. 
> So is the size 70 x 24 mm? Some sort of panorama view? I am asking this
> question in connection with the 70 mm back for Bronica. It is still not
> clear to me

The distance between the sprockets is exactly 60mm, 1.5mm less than
the total width of 120/220. Considering that the sprocket area is
now used for guiding the film over the film rails, you have
theoretically a little more width, but I don't think any system
differs much between 120/220 and 70mm.
Other than that, the same formatting is possible as with 120/220: a 
45mm long piece of film is used for the Bronica and Pentax 645 
cameras, a (nearly) 70mm long piece of film is used for Mamiya RB, 
and a 60mm piece is used for Rollei 600x (odd, hardly known detail: 
the Rollei backs use Mamiya internals!).


- -- 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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