Re: 70 mm back Bronica

[Don Roberts <droberts@xxxxxxxxxxxxx>]

Jaap Los wrote:
> =

> Re:  70 mm back for Bronica ETRSi 645
> =

> Attention Don Roberts (and of course others interested),
> =

> 1.  I understand there is HIE in 70 mm format.  What is the actual size=
,
> does it come in rolls which I have to cut myself or does it come in
> cassettes like HIE 35 mm. Is it some sort of panorama film 70 mm x 24
> mm?

The 70mm HIE is actually Kodak Aerographic 2424 ISO 400. It comes in
150' rolls which you must spool into cassettes. In the dark, you must
then start the film into another cassette and insert both into the back.

> 2.  Could you actually describe the 70 mm back  How can a 70 mm back fi=
t
> to a 645 camera. How can a 70 mm film be covered by a 645 camera, where=

> the biggest size is 60 mm.

The back is much longer than a conventional back and the bottom rear
slopes up.  The mounting part of the back is identical to the Bronica
backs since all differences are toward the rear.  The image size is
identical to the 120/220 backs with the extra space being taken up by
sprocket holes.

> 3.  What is the advantage of using 70 mm other than a wider picture. Is=

> it easy to handle and what are the specific problems.

The two big advantages are that you can get IR film in a larger format
without having to set up 4x5 and that you can get about 55 exposures per
roll simplifying the film changing in the dark problem. It takes a
little bit of practice to load but it's not really difficult.

> 4.  Do I need a special developing tank for 70 mm HIE and are there mor=
e
> items to be considered at developing.

Yes you do need a 70mm reel and tank although I know of people who use
paint cans for tanks. You do need to be good at loading 120/220 reels as
these are even touchier. You learn the knack rather quickly I believe.
The only other consideration I can think of off hand is drying the film
since each roll is 15' long.  (You can load shorter ones of course). I
put shower curtain hooks up along a clothesline in the basement and dry
horizontally by hooking sprocket holes on the hooks.  Seems to work fine
and actually dries faster than vertical hanging. =


> You see, a lot of questions.  Hope you don=92t mind! Thanks a lot!

No problem.  If I can help anymore feel free to ask.  Bear in mind that
I am rather new to 70mm myself.  Another list member, Jim Henderson, has
much more experience with this than I do although not with the Bronica.

> Greetings
> Jaap Los
> Holland

- -- =

Don Roberts =

Bittersweet Productions
Iowa City, IA

*
****
*******
******************************************************
*  To remove yourself from this list, send:          *
*         UNSUBSCRIBE INFRARED                       *
*       to                                           *
*         MAJORDOMO@xxxxx                            *
*----------------------------------------------------*
*   For the IR-FAQ, IR-Gallery and heaps of links:   *
*  http://www.a1.nl/phomepag/markerink/mainpage.htm  *
******************************************************

------------------------------