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Using a Gaoersi 6x12 Magazine with various frame sizes on one Film

I have been brought up using my father’s Plaubel(s), with their unique sheet film magazines, filled with
Agfapan and an occasional Ektachrome. It has taken me decades to realize that there is something like
an ”international” back standard, much more common and practical and for which there are new
developments even now, from China, like this Gaoersi 6x12 magazine – said to be capable of taking
6x6, 6x9 and 6x12 sized images on one film, in any order. 

In actual use however, the thing is not exactly self-explanatory, despite its Chinese instruction (I doubt
this is understandable even to Chinese speaking persons…)

There is a scale in the film window, another scale on one of the transport knobs and a little disk with
engravings – but what to do with this?
I have eventually compiled a table (after much trial and error), that shows the various film positions,
for the different formats.
For easy reference, I have given numbers to the various positions on the film window scale


If you restrict yourself to only using 6x9 and 6x12 images, this table becomes quite simple (and you
don’t have to take note of the previous image size)

If you include 6x6, this becomes more complicated and you do indeed have to take note of the previous
frame size (e.g. by using the small indicating disc in the film window)

This is meant to be read from left to right, so - as an example - if you wish to take a 6x9 picture and
the previous frame was also a 6x9, and the current frame number is in position 0, then you need to
add 2 to the current frame number and transport the film until this new frame number is in position 6.

Whether this is still practical in everyday use, I will have to find out...


 

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