As Sidney stated, B/W film responds differently to tungsten lights than daylight. Years ago (back in the olden days as my kids would say) B/W films came marked with two speeds, one for tungsten & one for daylight. The tungsten speed was generally 1/3 to 2/3 stops slower than the daylight, depending on the film type. As Sidney said a little testing if you want exact results.
On hot light dimming....... If you rig an outlet to put two of your 650 watt lamps in series, each will burn at about 163 watts output but will be much warmer in color temperature.
Cheers, Dave
On Friday, October 31, 2003, at 12:44 PM, Rev. Sidney Flack wrote:
Greg,
The problem of color temperature in B&W is similar to not applying a filter factor when using a #8 or #12 Wratten filter. If you look at the literature that comes with the film you use, particularly if it's Kodak, you should find and indication of a probable change in film speed if exposed under Tungsten lights. The cause is the warm (2500 - 3000 K) light temperature.
With just a little testing you may have enough information to determine appropriate film speed to use with your lights without extra manipulation.
Peace! Sidney
Gregory Fraser wrote:I planned on shooting b&w so I thought color temp would be irrelevent but I read on a couple of web sites that it actually is a big deal. I suppose if you need the tones exactly identical from shot to shot it would matter but I wouldn't think it would be that big a deal for an amateur like myself. Greg
