Yes, but if Sinar do not provide the camera software code to those companies, the backs won't work.
It's the same as Hasselblad: Everybody could make an adapter to use an Emotion with a HD3 but the camera must recognize the back, and that's software.
Don't you think?
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i am not a programmer, but i think you are overestimating how sophisticated the connections are....as long as the camera triggers the back, all is good and that is a very simple connection....as far as transfer of exif data and such....if someone really looks into it, it can't be too hard to figure it out...
for me the only reason the back should communicate with the camera is to fire it without an extra cable (this is no problem as long as the camera provides connectors (like the RZIID)) and it is nice to change the iso on the back or body and the other knows about it....
as far as exif data being transferred: the Hy6 will work with 30 year old lenses...don't expect to get the f-stop or focal length with your file....
as far as hasselblad goes: is there a reason why the emotion (or leaf or phase) backs with the H mount won't work on the H3? is it a different mount? i am not sure about this, but as far as i know, they do work, you just don't get the advantages of the H3 compared to the H1 or H2 (lens correction, battery powers camera and back,...)....so there is no reason to buy a H3 unless you buy a hass back with it....
my understanding is that the H3 behaves like a H2 if you put a different brand back on it....maybe i am wrong?
to put it in other words: if i bought an H3 (back and body) i can't use that back on my old H2 (with limited functionality)? that would make it worse then i thought it was!!!!!
either way this will not be the case with the Hy6...if you buy a Hy6 today, you get a 6008 with emotion and when the Hy6 actually ships, you can choose to keep the 6008 as a back-up (with a nice discount)...which implies that the back will work on both cameras (with adapters and probably some limited communications with the 6008)....