The following are in the order I tend yo use them:
1) I find I use an orange with TMAX most of the time.
2) I sometimes you a very light yellow in low light.
3) I use a yellow-green or green for portraits.
4) I usually use yellow with HP5+
5) I use red for dramatic effects and clouds
6) I use dark red for for even more dramatic effects
7) I use blue to enhance fog
Here is a dark red example with a GW690 and Ilford Pan F
Here is an example with a Nikon FM with Nikkor 55mm f/1.2 and a Blue filter and Efke 25
Here is a portrait with a GW690, HP5+, and a green filter
And here is an example with an TMAX100, an Olympus 35SP, and an orange filter
©2011 Chris Grossman