Don't belittle yourself, Comixx. I know more about the Apollo Hasselblads than I do about the normal off-the-shelf Hasselblads. And that is a handicap because I can't accurately describe how the cameras were modified. The expertise of a practicing photographer is indescribably important here.
I know the reseau plates had to be coated with a very thin layer of metal to bleed off the static charge. This, in my opinion, would have increased their halation effect and probably caused the "ghosted" fiducials in the Apollo 14 up-sun photos. While they are some of the most beautiful photos taken on that mission, they exhibit some interesting behavior.
I know the magazines had to be modified in order to deal with the interference between the darkslide and the reseau plate. This is a bit surprising because the reseau plate was not an Apollo-specific addition. It's a standard feature of the "Data" model Hasselblad. But if this is the case, you can see why they opted to handle the magazines as they did on Apollo. Omitting the darkslide and providing light protection by rolling the film into the magazine is probably a procedure Hasselblad had developed for dealing with reseau-equipped cameras on earth.
I know the magazines themselves were beefed up to provide extra protection against heat and sunlight.
I know the casing was modified to provide better thermal heat rejection.
I know that tabs were added to the rings in order to make them easy to operate in gloves.
I know some optional equipment (motor winder, exposure meter) was removed or omitted to save weight and reduce complexity.
We may never fully know why the Apollo Hasselblads were modified or used differently, but it's certainly helpful to have a baseline understanding of this type of equipment.
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