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Originally posted by MetalHead
There are weird lights in the skies - could just be the space shuttle
That's a "sunstrike."
For reasons of dexterity and mission planning, the darkslides were not re-inserted into the magazines prior to removing them from the camera.
Each roll of film was pre-loaded into its own aluminum magazine on earth in a darkroom. This is one way in which you can use a Hasselblad camera. (You can also load and unload the film yourself if you've only got one magazine, but it's hard enough to do if you're not wearing a space suit.) This preloaded magazine comes equipped with a darkslide -- a metal cover over the front of the magazine to keep light from ruining the film.
Normally to install a Hasselblad magazine, you lock into place on the back of the camera body and then remove the darkslide through a slot at the top. You can't advance the film or click the shutter until the darkslide is removed. And then at the end of the roll you slide the darkslide back into place and disconnect the magazine. It won't disconnect until the darkslide is in place.
Apollo mission planners realized this was unwieldy in a space suit. The darkslides were fitted with oversized rings to allow you to pull them out just by hooking your thumb in the ring and pulling it out. But the planners didn't want the astronauts to have to worry about where to put the darkslide or how to get it back into that little slot. And so they had Hasselblad modify the camera so that the darkslide could be removed prior to putting the magazine in place, and that it could be disconnected without replacing the darkslide. And so the astronaut got a new magazine from the supply (they were prelabeled and assigned to each task) removed and discarded the darkslide, and installed it.
Now this procedure will expose the first frame of film as the darkslide is removed. So after the astronaut installs the film, he will have to advance several frames in order to get to "fresh" film. And at the end of the roll he will have to leave some frames unexposed so that he can wind the already photographed frames safely into the depths of the magazine.
This procedure was never perfect. And so on most of the rolls of film, the first frame and the last four or five frames will have streaks, spots, blurs, and other symptoms of light leaking into the magazine when it wasn't attached to a camera. Your picture is sixth from the end of Roll 49, and the other pictures that follow show evidence of light leaking in.
has some other examples of light leaks.