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Game Over for NASA Moon-Landing Hoax
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Anonymous Coward |
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A question for someone with some photography experience, especially in the area of exposure.
Ive read that the hasselbald camera didnt have automatic exposure settings and that this had to be done manually.
I think (correct if wrong) someone here on this thread a while back said that Nasa had worked out the exposure time needed before they left and that the astronauts had some kind of instructions on how long to have the shutter open to get the right amount of exposure for the particular time of day depending on where the sun was, if this is correct, does anyone know where this information is stored in the nasa archives..
Could someone who has knowledge of exposure give me some education on the process of manually making sure exposure is correct... thanks..
Quoting: Anonymous Coward 11980848 Just talking about how it was done on Earth, but one can extrapolate the same method for the moon. The light value of a scene lit by full sunlight on a clear day is fairly constant. Once that constant is known, various combinations of aperture and shutter speeds (depending on speed of emulsion) can be worked out to give proper exposure. If one reduces the shutter speed, the aperture must be enlarged accordingly, to give proper exposure. All the rolls of consumer film had those little scales of aperture and shutter speed combinations to use in different conditions, in case one had no meter or didn't know what to do to make a manual exposure. According to the guide on the magazine, the camera was never moved off of 1/250. Then they switched between 5.6 and 8.0 depending on upsun or downsun. There's a very nice picture of the exposure chart, which itself contains a cute little compass with the f stops on it. What was the ASA/ISO of the film being used?
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