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two questions on f/stops


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#1 David Calson

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Posted 23 April 2008 - 02:06 PM

Hi,

When someone says they are lighting at say a 2.8-4 split, what does that mean?

On professional, expensive features do you USUALLY decide what stop you want to work at and then bring in the adaquite amount of lights or do you just use whatever lights are available and set your stop to that?

Thanks guys!
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#2 Adrian Sierkowski

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Posted 23 April 2008 - 02:11 PM

a 2.8~4 split would be setting the aperture between 2.8 and 4, 1/2 between them.
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#3 Michael Nash

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Posted 23 April 2008 - 02:28 PM

Usually you'll have a target f-stop in mind, and you design the lighting package around that. Or at least a range of f-stops (say 2.8-5.6).

For example, with anamorphic lenses you usually want to avoid the lowest f-stops because the image tends to lose sharpness wide open, so you try to light to an f4 or f5.6 (or whatever your tests determine) for the best image.

Sometimes with scenes like action/stunts or physical comedy you know you need enough depth of field to hold the action in focus, so you wouldn't handicap yourself by lighting to just any light level.

High frame rate shots also require more light, so for sequences with highspeed shots you usually light for the highest light level needed, and scrim the lights or ND the camera for the other shots to maintain a consistent f-stop between shots.
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#4 David Calson

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Posted 23 April 2008 - 02:53 PM

what would I do without this forum, thank your sirs!
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Ritter Battery

Tai Audio

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Broadcast Solutions Inc

Abel Cine

The Slider

FJS International, LLC

Paralinx LLC

Visual Products

Rig Wheels Passport

Aerial Filmworks

Wooden Camera

Technodolly

Willys Widgets

Gamma Ray Digital Inc

CineTape

Glidecam