The board that I reside on is trying to start a contest for digital photos. There is no prize, just brownie points or "respect".
The thing is, some people have thousand dollar cameras, while others have simple 3mp or even just camera phones.
How would you judge these photos without making too many categories?
Some people believe that post-processing is a must for them, but that gives them an unfair advantage over people who don't have the facilities to do so. I've seen some excellent photos taken from non-DSLR cameras because they were taken at the right time and place.
The contest is meant to be fun and good natured, but I have a feeling that it will be overrunned by the over-enthusiasts.