shooting with tungsten light source

[tanaka susumu]

I've heard that shooting with tungsten light source makes a film (B+W) underexposed about 1/2 stop if I expose the film accoding to meter reading. Is it true? thanks susumu

[Wayne_6692]

It depends on the spectral sensitivity of the film (and meter). Many of the films that are "panchromatic" are a little deficient in response on the red end of the spectrum, add to this the possible metering errors in reading the light, and you can be off by 1/2 stop or more.

[Pete Andrews]

I'll second Wayne's reply. Kodak used to give recommended daylight speeds and Tungsten speeds for their films. FI Tri-x is rated as 400 ISO in daylight and 320 ISO for Tungsten.