Is there a general resource that explains the characteristics of different film developers? i.e. how it affects contrast, grain, etc... I'm a novice, and have very limited experience with developing. In fact, D-76 and TMax developers are the only 2 I've ever used! Convenience is a major factor, so I like to use things that are readily available to me. Any good books or internet resources??? Thanks in advance for any help, sorry if this is a stupid question.