[rollei_list] Re: AW: Re: Rollei historical ads
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 28 Aug 2013 07:49:10 -0300
2013/8/28 PaintingWithLenses <paintingwithlenses@xxxxxxxxx>:
> .....
> ....Anyway - are these real 70x70 negatives or 6x6 on a 70mm roll
> (Regarding the image circle diameter of standard lenses, the tilt/shift
> lenses being an exception maybe)?...
The 70mm film width is 65mm to record the movie, however it is printed
on a real 70mm width film; the Rollei image is always 6x6 and the
Mamiya RB67 picture is always 6x7 using this film. The 120/220 film
width is 60mm; some cameras can handle the width difference, other
cameras can't do it. Still film cameras use the printing version with
real 70mm width because in the '60s Cine Mechanics made a 70mm back
for the Rollei TLR; the main problem with this back was the film
width, 70mm; the Rolleiflex film guidance free space is between 69.8mm
to 69.9mm and then the film was curved 0.5mm toward the lens on the
film focal plane due to the lateral upsetting with effect on the
picture sharpness (Rollei Report 4). Rollei considered this back an
interesting design but " no recommendable" for this reason.-
Carlos
.
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