Jump to content


Photo

Tri-X film with Daylight balanced bulb...


  • Please log in to reply
6 replies to this topic

#1 Steve Williams

Steve Williams
  • Basic Members
  • PipPip
  • 38 posts
  • Other
  • Jacksonville

Posted 10 November 2014 - 04:40 PM

Tomorrow I have a shoot that I had planned to film with TriX.  The interior will be mostly filled with daylight, but I plan on adding in an external light if needed (daylight balanced bulbs).  My question is, do I meter as if the film is reading 200 or 160 (for the tungsten bulb).  I'm guessing 200, but I'm trying to cross my t's and dot my i's before jumping in. 

 

Best regards, 

Steve


  • 0


#2 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 19636 posts
  • Cinematographer
  • Los Angeles

Posted 10 November 2014 - 05:21 PM

Mixed with daylight, I wouldn't worry about the 1/3-stop difference in speed.
  • 1

#3 Bill DiPietra

Bill DiPietra
  • Sustaining Members
  • 2339 posts
  • Cinematographer
  • New York City

Posted 10 November 2014 - 07:00 PM

Mixed with daylight, I wouldn't worry about the 1/3-stop difference in speed.

 

On that note, why is there a difference in speed for daylight/tungsten?  Does the blue in daylight add a 1/3 of a stop?


  • 0

#4 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 19636 posts
  • Cinematographer
  • Los Angeles

Posted 10 November 2014 - 07:11 PM

Though modern b&w film is panchromatic (sensitive to all visible colors) it is slightly more sensitive towards the bluer end of the spectrum.  Early b&w film was blue-sensitive only, then blue-green (orthochromatic, "ortho" meaning "correct" as in "correct colors"), and then panchromatic, "pan" meaning "all".  I guess it's because blue wavelengths have a higher frequency and thus carry more energy.


  • 1

#5 Bill DiPietra

Bill DiPietra
  • Sustaining Members
  • 2339 posts
  • Cinematographer
  • New York City

Posted 10 November 2014 - 07:26 PM

Thanks, David!


  • 0

#6 Josh Gladstone

Josh Gladstone
  • Basic Members
  • PipPipPipPip
  • 323 posts
  • Editor
  • Hollywood

Posted 10 November 2014 - 08:22 PM

Interesting stuff. Good to know!


  • 0

#7 Steve Williams

Steve Williams
  • Basic Members
  • PipPip
  • 38 posts
  • Other
  • Jacksonville

Posted 10 November 2014 - 09:40 PM

awesome guys, thanks for the help and explanation.  


  • 0


CineLab

Media Blackout - Custom Cables and AKS

Willys Widgets

Glidecam

Visual Products

Aerial Filmworks

Rig Wheels Passport

rebotnix Technologies

Abel Cine

FJS International, LLC

Broadcast Solutions Inc

Technodolly

CineTape

Metropolis Post

Tai Audio

The Slider

Ritter Battery

Paralinx LLC

Wooden Camera

Gamma Ray Digital Inc

Ritter Battery

Willys Widgets

FJS International, LLC

CineLab

Gamma Ray Digital Inc

Tai Audio

Paralinx LLC

Technodolly

CineTape

The Slider

Visual Products

Wooden Camera

Aerial Filmworks

Broadcast Solutions Inc

Media Blackout - Custom Cables and AKS

Abel Cine

Rig Wheels Passport

Metropolis Post

rebotnix Technologies

Glidecam