Batman wrote:In defense of people who look at you like you're speaking esperanto when you say things like "F-Stop" and "Shutter Speed", ther ARE some of us who don't know shit about photography.
If, of course, you're reffering to people who DO pretend to know about photography-growl away...
For reference, if your curious.
The F-stop of the camera is one of the rings on the barrel part of camera. You fiddle with it to control the amount of light that gets into the camera. In mechanical terms, it controls how wide the opening in the iris, and the higher the number, the smaller the hole and thus less light. Controlling the amount of light is useful, so you can get the right level of exposure for your film.
This works in conjunction with... the Shutter. The Shutter is your friend. The Shutter is love and life and happiness. More to the point, the Shutter is what allows you to take pictures of moving objects and make them not blurry and streaky, not to mention helps control the exposure of your picture. It's a mechanical device that opens and closes the iris of the camera, exposing the film to light. You can set the shutter for open and close quite rapidly or set it to stay open for a long time. That is the shutter speed. The camera I've been lusting for has a shutter speed ranging between 1/1000th of a second to a full second (I've head of cameras that go up to 1/10,000th of a second!). Video cameras actually work the same way. An NTSC Video Camera records film at 30 frames a second, meaning that the iris of the camera is opening and closing at 1/30th of a second while film reel shoots film behind it at a matching rate. For still photography, however, that can be unacceptable. For instance, if I'm taking a picture of a car, it's going to moving pretty quickly, and a shutter speed of 1/30th of a second is unacceptable. I'd probably dial my shutter to 1/500 sec, which is more than enough to snap a photograph of a moving car.
But Gil, you might say, what happens if your shutter speed is too quick? Not very much light can get into a camera if the iris is opening and closing that quickly. You're right. That's where Photography Skills comes in and practice, not to mention the F-Stop comes in. If you are taking a picture of a swing dancers in a club, you are going to need a high shutter speed, because they are moving quite quickly. However, it could be dim lighting, so you want to dial your f-number really low (the lower the number, the wider the hole) and get as much light as you can in there. Sometimes, you've got to make a compromise and accept a slower shutter speed for it to come out bright enough, even if there is a little blurriness (which isn't necessarily a bad thing, mind you).
Conversely, if you are out on a bright sunny day, you may want a faster shutter speed to cut exposure time, so your picture isn't overexposed. For example, dummies who say the Moon Landing never happened will occasionally point to photographs showing the lunar landscape and horizon and go "Where are the stars? They are in the middle of space, so the stars should be bright, but they aren't there! Lies!" This is where you smack them with a rolled pamphlet with the Sunny 16 rules printed on it. Sure the stars are bright on the moon, but the lunar surface is vastly brighter thanks to bright sunlight hitting it. The Apollo astronauts had to dial up their shutter speed because they were taking pictures of bright lunar rocks and other astronauts which would have been greatly overexposed had they left the shutter open long enough to pick up the stars, so the sky in those pictures are pitch black.
Sorry to lecture, but I don't often get a chance to rap about photography.
*The NBC jingle plays and a sign saying "The More You Know..." appears*