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Terry Mester

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If your Camera isn't equipped with an 'Auto Aperture' feature, or if you wish to control the Aperture manually, the following Chart provides f/stop Aperture (Lens Opening) settings for Indoor Lighting situations and distances for 40 ISO Film. It comes from Kodak for KODACHROME 40 Movie Film (Type A) - 7268 / 7270. You can print it out on your Printer, and keep it with your Camera if you don't have a Light Meter. The attached HTML File down below provides further information for Kodachrome 40. I invite experienced Cinematographers to offer your opinions on Aperture Settings you use for different ISO Films in the Indoor and Outdoor Light conditions mentioned in the Chart below and in the attached File.


Exposure Indoors

_ Lens _______ 650-watt Tungsten- ___________ 650-watt Tungsten- _______ 375-watt Tungsten-

Opening _ Halogen Movie Light Flood Beam__Halogen Movie Light Spot Beam___Halogen Movie Light

__ f/8 _____________ 4 to 6 ft ____________________ 6 to 9 ft __________________ 4 to 6 ft

__ f/5.6 ____________ 6 to 9 ft ____________________ 9 to 12 ft _________________ 6 to 7 ft

__ f/4 _____________ 9 to 12 ft ___________________ 12 to 17 ft _________________ 7 to 9 ft

__ f/2.8 ___________ 12 to 17 ft ___________________ 17 to 24 ft _________________ 9 to 13 ft

__ f/1.9 ___________ 17 to 24 ft ___________________ 24 to 35 ft ________________ 13 to 19 ft

Kodak offers the following Aperture Guide for the former Kodachrome 25 Film. (Click below)




Regarding the 'Auto Aperture' feature, it is important to note that its settings are predicated upon the Battery supplying 1.5 Volts. New Batteries run over 1.5 Volts, and used of course go lower. Any variations on the Auto Aperture setting shouldn't be noticeable between 1.4 to 1.6 Volts.


Edited by Terry Mester
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At what frame rate and shutter angle are these calculations for? Do they take into consideration the light lost for the viewfinder?

The attached K40 Data Sheet mentions 16 to 18 Frames per Second Camera speed, and an exposure of approximately 1/40 Second. The standard 18 f/s exposure is 1/30 Second (about 220 Degrees) which is one-third longer than 1/40. With Positive Film you can be up to one-half an f/stop off, and with Negative Film you can be even further f/stops off. These Charts cannot take into account any light lost for the viewfinder because Cameras vary, and some Cameras don't use a prism viewfinder. I believe my Sankyo uses a mirror. If your Camera has a prism, then you'll have to take that into account.

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