Can anyone tell me how to counter the harsh yellow lights typically lighting gyms? I have been disappointed with my attempts to photograph my son playing basketball. I am using the D70.
Assuming that you are not allowed to use flash to take your basketball pictures, perhaps the least expensive way to get the "yellow" out is to screw a color correction filter on the front of your lens. The filters numbered 85, 85A and so on are used to correct most yellow lighting or you might want to take a look at the 81 series filters. All depends on the color temperature of the lights themsleves so you may have to experiment to get it just right.
Did you try to set your White Balance to the correct lighting conditions? If you leave it on auto it will come out yellowish. Or like said use a filter to correct the color. That's what I do.
In a followup to Jer4222, set your white balance to "incandescent" lighting and that should reduce the yellowing effect. Also, you will need to increase you ISO setting to at least 400. Be careful above 400 as you may see grainyness in your photos. Also, it helps to have a lens with a 2.8 apperture.
If you shoot RAW image you can color correct in your computer. Do some test shots before the game to see which white balance gives you a comfortable starting point.
In a Gym Lighting situation the first thing I would adjust is my ISO rating to about 800 for clarity sake. Anything above that is generally too grainy. Also, read in your manual about adjusting your white balance. There are many settings (incandescent, direct sunlight, flourescent, etc...) Once you discover how the results respond to white balance changes and you are satisfied, then turn to adjusting your shutter speed and f-stop settings. I almost always use manual settings for my shots so I have to prepare for them before the action starts. Take a few shots before the game and see how the overall effect turns out.
Now, the filter numbered 80A should cover it. If the shots are still yellowish, you can do two things. One: get an 85A filter or Two: Stay with the 80A and adjust the white balance on your camera