O.K gents, photography is a subject I know a great deal about. I'm not trying to toot my horn but I studied photography for two years in college plus I took the NYI Photography course.
1. Always use a tripod for stabilization.
2. Always use a release cable or self-timer to avoid camera shake.
3. Use a hand held light meter or flash meter to get correct exposure.
4. If you want crisp clean close-up shots use a macro lens or a camera with a macro setting. This will allow you to get close to your subject without using a zoom lens.
5. The ISO rating is the "International Standards Association". This system was currently known as the ASA. (American Standards Association.)
6. ISO refers to the sensitivity of a given film. The higher the number the less light needed to activate the silver-halide of the film. The higher the number also yielded a grainier image. Digital tries to emulate the same standard.
7. Film Latitude, anybody? This is a lengthy subject but a subject well worth knowing. Here's a quick explanation.
(Your camera lens sees a wider range of light than your camera will actually be able to record.)
This can cause many of our exposure problems. The human eye has latitude of 50,000. This means that the brightest light the eye can see is 50,000 times greater than the faintest light we can see. Now lets consider film latitude. Black and White has the best latitude at about 500 for Tri-X and Plus-X about 125. That's a huge difference from the human eye of 50,000. Digital still hasn't solved its latitude problems.
8. Hyper-focal is another way of achieving the best depth of field for any given lens. You need an SLR camera for this type of shooting. I wont continue on because this could take about 50,000 words to wrap up. If anyone wants to know about Hyper-focal settings just pm me. I'll be happy to share.