But you are wrong about lighting. You only have to increase the lighting if you are reducing the aperture without increasing the exposure time. My example of 2 seconds at f16 and ¼ second at f2 let precisely the same amount of light through the lens.
And just because you aren't exposing film doesn't change mean the amount of light coming through the lens is not relevant. CCD's do have light sensitivity ratings that are equivalent to ASA ratings, in fact my camera has three settings in this regard, 100 ASA equivalent, 200 ASA, and 400 ASA.
In the end you have four variables regarding exposure, regardless of whether you are exposing film or a CCD:
1. Luminosity (i.e. how much light you have to work with) 2. Sensitivity (i.e. "ASA" - how much light you need) 3. Aperture (i.e. How big a hole you let the light pour through) 4. Exposure (i.e. How long you let the light flow through the hole)
The all work in terms of halves an doubles: all these combinations will result in the film or CCD getting hit by the same number of photons:
1600 lumens, 400 ASA, f8, ¼ second 3200 lumens, 200 ASA, f4, 1/8 second 1600 lumens, 400 ASA, f16, ½ second 1600 lumens, 200 ASA, f16, 1 second 800 lumens, 100 ASA, f16, 4 seconds
So yeah, doubling the lumens will compensate for halving the aperture, but so will doubling the exposure time. So while it's impractical to be trucking around searchlights, you can carry a tripod, brace the camera, or just plain hold still for the longer exposures.
Problem is you are thinking in terms of moving pictures where you are only going to get a maximum of 1/24th of second with film or 1/30th of a second with video to expose your image. Exposure time is a constant with moving pictures, not so with still photography.
"So yeah, doubling the lumens will compensate for halving the aperture, but so will doubling the exposure time....Problem is you are thinking in terms of moving pictures where you are only going to get a maximum of 1/24th of second with film or 1/30th of a second with video to expose your image. Exposure time is a constant with moving pictures, not so with still photography."
You are right , I guess I am thinking with time constraints. But I have found that with most pictures (in the general public) People are ASSHOLES!! They love to bump into you , walk into your shot , get in the way - or generally are filled with their ownn self importance that the somehow think they DESERVE to be in a total strangers picture. I have had to take most of my shots guerilla style .. get in..snap the shot quickly .. and get out without a trace before some inconsiderate bastards fuck up your work. I also find setting up a tripod a pain in the ass. especially when I am moveing locations constantly.
Have you seen the little tripod I bring to the club sometimes? I can use it against my chest. If I hold my breath I can get good pictures up to about 4 seconds or so (just holding the camera anything over a ¼ second is iffy). It doesn't work if I am zoomed in too far because then my heartbeat becomes an issue. Alternately I can hold it against a wall, pillar, or other stationary surface with one hand and trip the shutter with the other.
Working around the people who get in your way or bump you is a different talent. I don't know what to say there other than keep both eyes open and stay conscious of what going on around you. I'm running around in crowded clubs and pulling off longer exposures. Sometimes, though, the only way to get the good shot (like at the fashion shows) is to be more of an asshole than the next guy.
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no subject
Date: 2002-12-12 12:39 pm (UTC)But you are wrong about lighting. You only have to increase the lighting if you are reducing the aperture without increasing the exposure time. My example of 2 seconds at f16 and ¼ second at f2 let precisely the same amount of light through the lens.
And just because you aren't exposing film doesn't change mean the amount of light coming through the lens is not relevant. CCD's do have light sensitivity ratings that are equivalent to ASA ratings, in fact my camera has three settings in this regard, 100 ASA equivalent, 200 ASA, and 400 ASA.
In the end you have four variables regarding exposure, regardless of whether you are exposing film or a CCD:
1. Luminosity (i.e. how much light you have to work with)
2. Sensitivity (i.e. "ASA" - how much light you need)
3. Aperture (i.e. How big a hole you let the light pour through)
4. Exposure (i.e. How long you let the light flow through the hole)
The all work in terms of halves an doubles: all these combinations will result in the film or CCD getting hit by the same number of photons:
1600 lumens, 400 ASA, f8, ¼ second
3200 lumens, 200 ASA, f4, 1/8 second
1600 lumens, 400 ASA, f16, ½ second
1600 lumens, 200 ASA, f16, 1 second
800 lumens, 100 ASA, f16, 4 seconds
So yeah, doubling the lumens will compensate for halving the aperture, but so will doubling the exposure time. So while it's impractical to be trucking around searchlights, you can carry a tripod, brace the camera, or just plain hold still for the longer exposures.
Problem is you are thinking in terms of moving pictures where you are only going to get a maximum of 1/24th of second with film or 1/30th of a second with video to expose your image. Exposure time is a constant with moving pictures, not so with still photography.
no subject
Date: 2002-12-12 01:16 pm (UTC)Digital zoom is not zoom..it's cropping
"So yeah, doubling the lumens will compensate for halving the aperture, but so will doubling the exposure time....Problem is you are thinking in terms of moving pictures where you are only going to get a maximum of 1/24th of second with film or 1/30th of a second with video to expose your image. Exposure time is a constant with moving pictures, not so with still photography."
You are right , I guess I am thinking with time constraints.
But I have found that with most pictures (in the general public)
People are ASSHOLES!! They love to bump into you , walk into your shot , get in the way - or generally are filled with their ownn self importance that the somehow think they DESERVE to be in a total strangers picture. I have had to take most of my shots
guerilla style .. get in..snap the shot quickly .. and get out without a trace before some inconsiderate bastards fuck up your work. I also find setting up a tripod a pain in the ass. especially when I am moveing locations constantly.
no subject
Date: 2002-12-12 01:58 pm (UTC)Working around the people who get in your way or bump you is a different talent. I don't know what to say there other than keep both eyes open and stay conscious of what going on around you. I'm running around in crowded clubs and pulling off longer exposures. Sometimes, though, the only way to get the good shot (like at the fashion shows) is to be more of an asshole than the next guy.