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Originally Posted by beerguy0 View Post
My responses to your four questions. Probably not enough for you, but it's my best shot.
I hear what you're saying and appreciate your time to respond.
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Originally Posted by beerguy0 View Post
You don't need a lunar Hasselblad. Take any camera, and set it to normal daylight exposure, say 1/125s@f/16, using the sunny 16 rule. (ISO 100 for a digital camera) Also, read what he said carefully - same camera settings, not the same camera.
I suppose this one we will have to agree to disagree, I don't see how the lunar Hasselblad can be compared to a $100 Sony Cybershot. 1/125s@f/16 ? ~ f/16 would be used for scenery not something in the foreground, further more 1/125 wouldn't be used with f/16, it likely wouldn't even be sharp. Also do you really think they used ISO 100? I would guess more likely they used 1600, 3200, I'm not sure what that camera was capable of but remember there was no viewfinder, so in theory you would want to play it safe. |
Agree to disagree? The only thing that I agree to is that you have zero knowledge of film, photography, or cameras, nor will you listen to someone who has that knowledge. A quick Google search (what film did the Apollo astronauts use) finds this:
Photography During Apollo
Among the films they used were ISO 80 B&W film, plus custom Ektachrome in what looks to be the equivalent of ISO 64 and ISO 120. There did not exist in 1969 high speed color films, like 1600 and 3200, nor was there any need for them. They were shooting images of things in
full sunlight. The Sun doesn't get any brighter than in space. You would probably need a neutral density to even attempt an exposure under those conditions. (The shutters in Hasselblads are large, and consequently probably the top speed is like 1/500 s) Furthermore, high ISO films are of very poor image quality, especially the early ones. Very grainy and noisy. They were shooting 70mm film for the best image quality - it would be foolish to even consider using high speed film.
The exposure time I guessed at is an entirely reasonable value for a sunlit scene. f/16 gives you great depth of field, which is desirable in this instance. And BTW, Hasselblads do have viewfinders - large, waist level viewfinders, suitable for use with a helmet.
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Originally Posted by beerguy0 View Post
Waving a Flag on the Moon
Perhaps this is a better explanation?
Unfortunately no. I am talking about the video of the flag flapping without anyone touching it. Nasa gave 5 bumbling explanations for it, needless to say it sounds like there looking for an excuse. EVA-2 Closeout (148:57:15) |
You're on your own here.
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Originally Posted by beerguy0 View Post
I've seen Harriers land in person. There's a lot of dust, depending on conditions, but no crater. Also, depending on the depth of the lunar regolith, once the dust has blown away you're down to rock, which is much more resistant to the rocket blast. A rocket lifting off is more likely to make a crater, since it has to build up thrust. - that's why NASA has launch pads with heatproof blast pits.
Theres a couple problems with this theory; "once the dust has blown away" how would the dust blow away on the moon? Okay, so let's agree theres no blast crater, you would at the very least expect the dust under the module to have blown away but this just isn't the case as seen in pictures. |
Are you serious? Pick up a handful of dust. Blow on it. Watch it fly away. Mystery solved.
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Originally Posted by beerguy0 View Post
The moon has no atmosphere. We have hot days on Earth because the air heats up. No air, no heat. The temperatures often quoted for the moon are surface temperatures. The side of the camera facing the Sun will get hot, but the rest of the camera is radiating heat away into space. Outer space is a pretty effective heatsink.
You addressed this but lets think about it for a second; Temperature on the moon does indeed mean the surface temperature, silver/white objects would reflect most heat, while dark/black objects (like the Hasselblad) would retain the heat. For arguments sake I will agree with your analogy of the heatsink; the side facing the sun would be upwards of 123°C, the side away from the sun would be -233°C ~ do you know what happens to plastic, metal and glass at these extreme temperatures? |
From the link I posted:
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The outer surface of the 500EL data camera was colored silver to help maintain more uniform internal temperatures in the violent extremes of heat and cold encountered on the lunar surface. Lubricants used in the camera mechanisms had to either be eliminated or replaced because conventional lubricants would boil off in the vacuum and potentially could condense on the optical surfaces of the lenses, Reseau plate, and film. |
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Originally Posted by beerguy0 View Post
If there was sufficient radiation to melt the camera, I don't think the space suit would have fared much better.
I agree with you on this one. |
Gee, thanks
You obviously have no understanding of science, physics, or space, and even less of photography, yet you argue with every factual statement. Learn something about what you're arguing about.