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APERTURE SETTINGS


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#1 Terry Mester

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Posted 04 January 2007 - 02:07 AM

If your Camera isn't equipped with an 'Auto Aperture' feature, or if you wish to control it manually, the following Guide will provide accurate Aperture Settings to use in varying Outdoor Light conditions. Indoor filming would likely require less than f/2.8 -- probably f/2 or less. The Guide comes from an old Camera respecting Kodachrome 25 ISO Film, but it should be valid right through 100 ISO. You can print it out on your Printer, and keep it with your Camera if you don't have a Light Meter. I invite experienced Cinematographers to offer your opinions on Aperture Settings you use for different ISO Films in the five light conditions mentioned in the Guide.

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.

APERTURE SETTING GUIDE
f/2.8 OPEN SHADE (clear sky)
f/4 CLOUDY BRIGHT
f/5.6 HAZY SUN
f/8 BRIGHT SUN
f/11 BRIGHT SUN (on light sand or snow)
For LIGHT Subjects use 1/2 f/stop HIGHER
For DARK Subjects use 1/2 f/stop LOWER
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#2 Mark Dunn

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Posted 04 January 2007 - 07:32 AM

Unfortunately your table is far, far too much of a generalisation., and an inaccurate one at that. You can't possibly use the same exposure over a two-stop range with colour reversal. The bright sunlight setting for K25 (which is no longer made, btw) is more like f/16 at 18fps, shutter speed being about 1/30 sec. In the absence of a decent automatic exposure, there's no substitute for an accurate hand meter.
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#3 Jonathan Bowerbank

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Posted 04 January 2007 - 12:14 PM

APERTURE SETTING GUIDE
f/2.8 OPEN SHADE (clear sky)
f/4 CLOUDY BRIGHT
f/5.6 HAZY SUN
f/8 BRIGHT SUN
f/11 BRIGHT SUN (on light sand or snow)
For LIGHT Subjects use 1/2 f/stop HIGHER
For DARK Subjects use 1/2 f/stop LOWER



Yeeeeeeah, it'd be nice if life were this easy.
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#4 Terry Mester

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Posted 04 January 2007 - 09:58 PM

I should have explained that the Camera with the Guide is a Regular 8mm (using 16mm Film) Kodak Brownie with a 13mm Lens. I started this Thread to create a central guide for Amateurs regarding Outdoor Aperture Settings for Reversal (Transparency) Films. Professional Cinematographers should have a good idea regarding Aperture sizes for 64 & 100 ISO Reversal Films (18 frames/second) under the five light conditions (Shade to Bright Sun) mentioned in the Guide. Reversal Film is more finicky than Negative, and I don't want to see Amateur Super8 users give up on this format because of exposure problems. Due to the lack of pleasure with Ektachrome 64T, Super8 users will need to go with Ektachrome 100 -- unless Kodak should give us Kodachrome 64. There may be problems with using the Auto Aperture with 100 ISO Film. Many lower-end Cameras don't have an Auto Aperture setting, and Amateurs need advice from experienced Professional users. Instead of every new user posting a Thread asking for advice, having this one central Thread for Aperture advice would be a better approach.
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#5 Clive Tobin

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Posted 04 January 2007 - 11:37 PM

...
f/8 BRIGHT SUN
...

Some misinformation here. This exposure guide was for the old ASA 10 Kodachrome (*not* ASA 25) which has not been made for decades, used in an 8mm camera running 16 FPS with 1/35 second exposure time.
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#6 Mark Dunn

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Posted 05 January 2007 - 06:15 AM

That sounds about right. There's the old still photographer's reciprocal rule- f/16 in bright sunlight for a shutter speed which is the reciprocal of the ASA rating. The OP has found a very old data sheet.
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