Jump to content


Photo

Is viewfinder light loss avoidable?


  • Please log in to reply
2 replies to this topic

#1 Stephen Alexander Griebel

Stephen Alexander Griebel
  • Basic Members
  • PipPip
  • 36 posts
  • Director
  • Los Angeles

Posted 07 October 2006 - 12:41 PM

I keep on reading how to compensate for super 8mm reflex viewfinders' light loss and am wondering if by simply closing the eyelid on the viewfinder you can save the 1/3 stop lost by it (that's the number I have found on these forums). If so, as long as your eye is pressed firmly, wouldn't that stop the loss as well-- I know that's the way it was with my reflex 35mm Konvas but I'm not sure if the split-image viewfinder has this affect or not.
  • 0

#2 Stephen Alexander Griebel

Stephen Alexander Griebel
  • Basic Members
  • PipPip
  • 36 posts
  • Director
  • Los Angeles

Posted 07 October 2006 - 12:52 PM

forgot to mention that I'm using an external meter (the internal compensates I assume).
  • 0

#3 Robert Hughes

Robert Hughes
  • Basic Members
  • PipPipPipPip
  • 873 posts
  • Sound Department
  • Minneapolis

Posted 07 October 2006 - 02:54 PM

The light loss of any prism reflex camera (of which almost all Super 8 cameras are) is due to the light splitting prism, which redirects a small portion of the incoming light into the viewfinder optics, allowing the remainder to travel on to the film gate. In-camera lightmeters are calibrated to compensate for this light loss. If you're using an external lightmeter, you need to compensate manually for this loss, perhaps by lowering the ASA reading on your meter, or by some equivalent method.

Opening or closing the viewfinder optical path makes no difference, except if you keep it open and don't place your eye there, you will get light leakage from the eyepiece onto the film.
  • 0


rebotnix Technologies

Visual Products

FJS International, LLC

Broadcast Solutions Inc

The Slider

Rig Wheels Passport

Abel Cine

Willys Widgets

Tai Audio

New Pro Video - New and Used Equipment

CineTape

Paralinx LLC

Metropolis Post

CineLab

Wooden Camera

Aerial Filmworks

Glidecam

Technodolly

Gamma Ray Digital Inc

Media Blackout - Custom Cables and AKS

Ritter Battery

Wooden Camera

Glidecam

Metropolis Post

Rig Wheels Passport

Abel Cine

Gamma Ray Digital Inc

Paralinx LLC

CineLab

Technodolly

Media Blackout - Custom Cables and AKS

Visual Products

Tai Audio

Broadcast Solutions Inc

New Pro Video - New and Used Equipment

Aerial Filmworks

FJS International, LLC

Willys Widgets

Ritter Battery

The Slider

CineTape

rebotnix Technologies