Jump to content


Photo

Metering light for digital


  • Please log in to reply
4 replies to this topic

#1 Nick Norton

Nick Norton
  • Basic Members
  • PipPipPip
  • 248 posts
  • Student
  • Chicago

Posted 10 June 2008 - 03:49 PM

I've started shooting with an HD Sony, and own a Spectra IV light meter.

However, i'm not sure how to use it with this camera. What do i set the film speed at etc.



Thanks-

Nicholas
  • 0

#2 Adrian Sierkowski

Adrian Sierkowski
  • Sustaining Members
  • 7374 posts
  • Cinematographer
  • Los Angeles, Ca

Posted 10 June 2008 - 04:10 PM

Basically HD cameras don't have a real ASA/ISO. Their sensitivity will vary based on what's around, and what you're doing to the image later on . Normally you would set exposure based on zebras in the viewfinder and/or a waveform monitor.
However, if you want to use your meter for an evaluation of the scene (w/o camera or whatever) you should illuminate a 18% grey card, meter it (spot) and see how it reads, and then zoom in with your camera and set the aperture on it until it appears neutral grey as well. Then you fiddle with your ASA till your meter reads the same as the camera's F-stop. This is your "effective," or "evaluation," ASA. That's how I do it.
Generally try around 200 at first, I have found most cameras to be in the 200~400 asa range.
  • 0

#3 Bob Hayes

Bob Hayes
  • Basic Members
  • PipPipPipPip
  • 1087 posts
  • Cinematographer
  • Culver City, California

Posted 11 June 2008 - 12:53 AM

A meter is a good way to keep your lighting levels even on a large set and also make sure you are not under exposed on big night exteriors. The earlier post gave the correct way to rate your camera. One trick thing about using a meter is that the cameras are so adjustable these days. Adjusting the gamma for example changes where your 18% would fall in your over all exposure of the image.
  • 0

#4 Ralph Keyser

Ralph Keyser
  • Sustaining Members
  • 120 posts
  • Cinematographer

Posted 11 June 2008 - 12:27 PM

Generally try around 200 at first, I have found most cameras to be in the 200~400 asa range.

Also, be aware that your effective ASA rating may change as conditions change. Many digital cameras behave differently in bright light vs. dim light even if the gain remains unchanged.
  • 0

#5 Matteo Castelli

Matteo Castelli
  • Basic Members
  • PipPip
  • 22 posts
  • Cinematographer
  • Italy

Posted 16 June 2008 - 02:58 AM

I don't think the most important issues is "what asa is my camera"..
The lightmeter is useful to control the light ratios all over the scene and you can do it with the footcandles readings of your lightmeter..
after that you can set the right aperture direclty thru the lens/viewfinder, as I suppose you've always done since now..

what do you think about it?
  • 0


The Slider

CineTape

Gamma Ray Digital Inc

Paralinx LLC

Tai Audio

Aerial Filmworks

Broadcast Solutions Inc

Abel Cine

Media Blackout - Custom Cables and AKS

FJS International, LLC

rebotnix Technologies

New Pro Video - New and Used Equipment

Glidecam

Willys Widgets

Visual Products

Rig Wheels Passport

CineLab

Technodolly

Wooden Camera

Metropolis Post

Ritter Battery

The Slider

Gamma Ray Digital Inc

CineLab

Metropolis Post

Aerial Filmworks

Broadcast Solutions Inc

Tai Audio

Visual Products

rebotnix Technologies

Technodolly

Paralinx LLC

Ritter Battery

Abel Cine

New Pro Video - New and Used Equipment

Wooden Camera

FJS International, LLC

Willys Widgets

Glidecam

CineTape

Media Blackout - Custom Cables and AKS

Rig Wheels Passport