Hey Maggie!
To my knowledge there is no such settings.. but there are ways to make that happen with most cameras. Fist off, you need to understand a little about light, and a lot about photography. That with a few simply and in-expensive props, you can make black backgrounds too.. Here are a few of mine with the black background and a brief description of how I did it. If you have any questions, feel free to to email me..
tposborne@xtremecombatsports.com
This is an emeral tree boa, simply shot in his cage with a black back wall.
Day Gecko, shot in a very dark room, using only a flash to light it with a relatively fast shutter speed. The shutter was not open long enough to pick up the surroundings.
Red Eye Tree Frog, Shot in low light, with nothing in background for several feet.. the little bit of color present is part of the plant the frog is sitting on.
RETF #2
Another Emerald Tree Boa.. again simply a black wall in the cage.
ETB again.. same as above.
For this guy, I used a different technique. I have set the snake on a piece of project board, with a second one upright in the background. It is a black board, made by Elmer's (the glue company) and I picked them up at Wal-Mart for about $2 each.
More foam board fun..
This one has two pieces of foam board.. but the bottom one is yellow.. dont be afraid to vary the colors.. I think the yellow really brings out the colors in alot of Herps!
This is one of my new RETF's.. she is about 10 days old now.. taken in very low light with a dark backdrop (back wall of vivarium. The pic is not the greatest.. but you get the idea.. noise is bad as well, this was at iso3200.
If you would like to browse my work, you can see more of my photos at:
Tim's Photo Gallery.