Sanders, agree with you about Roger's book. Simply done, so even I can understand what is said, and the diagrams really help explain things. I'm still plowing through it in small sips, but do think it is a great aid to getting the right look in an image.
Singlo, I'm just starting with this whole portrait business and got a couple of 650 watt hot lights. No lenses in fornt of the bulbs, but I've been using a scrim or two, diffusion and distance to start working out light ratios. With the 650 watt bulbs, I need to keep the key light up and out of the eyes, or squinting is the result. The fill is a bit more gentle and farther away. 650 watts on your face is a lot of heat from a couple of feet away. Not sure I'd want 1,000 watts at 2 meters.
TX400 is a good choice for roll film (mf), but I still need to get things worked out with lighting before I jump up to the 4x5 or 8x10 txp. Will be using txp once I have things in hand a bit more with lights.
One thing I'm seeing more now, in some of the images I view, is how little exposure was actually used. At times, there is not enough exposure to give full shadow detail. They must have been just on the lower edge of exposure, which dropped some shadow values to nothing. Coming from a landscape background, I need to look at exposure again. What was a "good" exposure is now too much in some of my attempts. This changes the look a lot. Another help can be the use of a very dilute developer and longer development times. You can get away with less exposure and still keep good tonality with this method. tim