HSI and Flash Bulbs

[WR <rivelli@xxxxxxxxxxxxxxxxxxx>]

Clive-

I don't have the data sheet, but I looked in my 1947 copy of Graphic
Graflex photography under Infrared Flash and found:

Eastman Regular Infrared Film has a Weston rating of about 4; the Eastman
New Type Aero Infrared Film may be 3 or 4 times faster.The GE IR flashlamp
No. 5R has a guide number of 55 @ 1/50 sec with the Regular film. The guide
number for the GE 22R bulb and Regular film is 90. A slight focusing
correction may be required for lenses over 7 inches in focal length.

Cheers!

William Rivelli         212 254-0990
303 Park Ave South      212 254-0922  FAX
New York, NY 10010

rivelli@xxxxxxxxxxxxxxxxxxx
    www.rivelli-william.com


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