Originally Posted by BrettD
My inclination is that you'd want to shoot in color and convert in post since you could decide post-shoot how each color is reflected in gray tones. Basically it would be like shooting without a filter and then applying the filter in developing. Obviously you could just use a filter while shooting, but then you'd have to make this creative decisions pre-shoot.
I'm curious what others think though.
Brett is completely correct. You have an infinite number of ways to create B&W photographs from color photographs. You can mix channels, use various blends and masks. If you shoot in B&W, you have handed over one of the most creative aspects of creating a B&W photo to your camera. I'd never do that.
Incidentally, here's something you might want to try to add some punch to your photographs. On the bottom layer, have your corrected color version. On layer above and in luminosity blend mode
, place a B&W photograph. You might wish to turn down the opacity and/or use a mask on the B&W photograph.
Getting back on track to the B&W photographs, Nik Software produces a very good plug-in called Silver Efex Pro 2