Jump to content


Photo

EI/ISO values for video cameras


  • Please log in to reply
3 replies to this topic

#1 Daniel Sheehy

Daniel Sheehy
  • Basic Members
  • PipPipPipPip
  • 407 posts
  • Other
  • Brisbane

Posted 15 July 2005 - 01:49 AM

hi, I am a lighting camera operator for a production company in Suva (FIJI)

I was wondering if anyone had calculated or knew the equvalent EI or ISO values for either of these two Sony SP Betacam cameras (with a gain setting of 0db):

-DXC 637 with 6.8 x 12 fujinon wide zoom lens
-UVW 100 with x16 zoom lens (I think this one is a cannon lens)

I am aware that there is a way to calculate it, but at the moment my waveform monitor is out of action...

thanks in advance for any info..

daniel
  • 0

#2 Laurent Andrieux

Laurent Andrieux
  • Sustaining Members
  • 1527 posts
  • Cinematographer
  • France

Posted 15 July 2005 - 06:36 AM

the 637 is given for F 8 at 2000 lux that is about 400 ISO
the UVW 100 is given for F 11 at 2000 lux, wich is about 800 ISO
  • 0

#3 Laurent Andrieux

Laurent Andrieux
  • Sustaining Members
  • 1527 posts
  • Cinematographer
  • France

Posted 15 July 2005 - 06:51 AM

Sorry, wanted to edit, but too late...


The 637 reference I 've got is assuming an Hyper HAD sensor :
http://www.scubatech.com/637.htm

The UVW 100, a Power Had one :

http://betacam.palsi...vw100feat.shtml

the rule is : N²/t = E.S/250, where N is the F stop, t the exposure time, E the required lumination (generally 2000 lux for the given carachteristics)

What you can also do if you have no waveform monitor, as a quick guide with a lightmeter :

- have a properly set monitor,
- frame an average scene with no peak of light, nor large dark areas, incident light being the same on the whole set ; no backlight.
- press the momentary auto iris button
- check the given stop by the auto iris system
- measure the incident light of the scene, whatever sensitivity you compute, but set the proper exposure speed
- search while changing the sensitivity setting wich sensitivity gives you the same stop as the camera has given
- a difference of a third of a stop or less is acceptable
  • 0

#4 Daniel Sheehy

Daniel Sheehy
  • Basic Members
  • PipPipPipPip
  • 407 posts
  • Other
  • Brisbane

Posted 17 July 2005 - 04:36 PM

Yes the sensors are as you described.

thanks again for the info.
  • 0


CineTape

Metropolis Post

FJS International, LLC

Broadcast Solutions Inc

Gamma Ray Digital Inc

Abel Cine

Willys Widgets

The Slider

Media Blackout - Custom Cables and AKS

rebotnix Technologies

CineLab

Rig Wheels Passport

Glidecam

Opal

Technodolly

Wooden Camera

Paralinx LLC

Visual Products

Tai Audio

Ritter Battery

Aerial Filmworks

Willys Widgets

Visual Products

Broadcast Solutions Inc

Abel Cine

FJS International, LLC

The Slider

Rig Wheels Passport

Opal

Ritter Battery

Glidecam

CineLab

Media Blackout - Custom Cables and AKS

Technodolly

rebotnix Technologies

Aerial Filmworks

Gamma Ray Digital Inc

Wooden Camera

Metropolis Post

Paralinx LLC

Tai Audio

CineTape