Light temperature for B/W
Posted 05 April 2007 - 06:20 PM
thanks alot for any information on this.
Posted 05 April 2007 - 06:45 PM
eg. Plus-X Daylight 50/18 - Tungsten (3200 K) 40/17 - indicating it is more sensitive to the shorter wavelengths ...
I think thats pretty indicative of most other B+W types also
Posted 05 April 2007 - 07:07 PM
Posted 05 April 2007 - 07:28 PM
Posted 05 April 2007 - 08:00 PM
One of the b&w versions of "Dr. Jeckel and Mr. Hyde" used a trick where the Mr. Hyde make-up was in one color and the Dr. Jeckel make-up in the opposite, so when they faded from green to red lighting, I believe, on panchromatic stock, the make-up effect faded in or out to create the transition in-camera.
Posted 06 April 2007 - 12:05 PM
This may seem like a small amount, but there is a definite loss of speed under tungsten. I shot some B&W stills back in the day, before I knew the 1/3 stop sensitivity loss, and I lost shadow details because I didn't account of the color temperature.
Basically, this is because, while panchromatic film is sensitive to almost all of the colors of the visible spectrum that the human eye is, it is natively sensitive to blue/ultraviolet wavelengths that predominate daylight but are lacking for tungsten bulbs.
I have no clue on fluorescents. THey're so ugly, and flicker so much I'd honestly just avoid them.
You can still get 3400K movie bulbs (I think 250) that will fit in wall sockets at Photographic Suppliers. I'd recommend them as they work great in a crunch for supplemental or background lighting.
Oh, one more thing lest I forget. Do NOT filter B&W for color temperature unless you want to adjust the TONALITY of a specific color as it relates to the greys of the other colors as they show up on the negative. In other words, if you want reds to pop out on a rose you're shooting with B&W, you can use either a red or a green filter to heighten the contrast between the two colors. Red'd be best here as it would darken the green (on the print, it'd physically block out green light on the negative), and lighten the red.
Edited by Karl Borowski, 06 April 2007 - 12:08 PM.