Magazine article American Cinematographer

Questions & Answers

Magazine article American Cinematographer

Questions & Answers

Article excerpt

(Inquiries are invited relating to cinematographic problems. Address: Q. & A., AMERICAN CINEMA TOGRAPHER, P O. Box 2230, Holly wood Calif. 90028.)

Q Is there a formula for making adjustments between conventional light meters and the T-Stop lens?

A The approximate difference between a T-Stop lens and an f-Stop lens is about 1/3 to 1/2 Stop and this varies with the focal length of the lens, the longer focal length lens having more elements would naturally have a greater light loss. In general, when comparing a T-Stop calibrated lens with an f-Stop lens, the T-Stop lens should be considered to be 1 /3 to 1 /2 Stop faster as it relates to a conventional exposure meter.

The only absolute way to determine proper relationship between a conventional exposure meter and a T-Stopped lens, would be film test, which gets back to the age old advice, controlling the variables in photography; "tuning up all of the equipment" -exposure meter to camera (T-Stop or f-Stop lens), consider the shutter-film sensitivity and, of course, processing.

Q I am shooting a film entirely in snow. As I don't have any experience in snow photography, I would like certain basic information which would make my work considerably simpler.

1. Do you think there are any special precautions to be taken while handling film, keeping in mind the sub-zero temperature?

2. What type of meter reading is preferred? Incident or reflected?

3. What is the exposure latitude of the film while shooting snow scenes?

4. What precautions should one take to ensure that the equipment does not give trouble? …

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