Jump to content


Photo

Measuring Focus through a Mirror??


  • Please log in to reply
2 replies to this topic

#1 Doron Kipper

Doron Kipper

    New

  • Basic Members
  • Pip
  • 8 posts
  • Other

Posted 14 February 2008 - 01:22 AM

I have a film camera without a reflex viewfinder...so I've had to resort to using a tape measure for my first film shoot at school to achieve sharp focus. How should I go about focusing on something in the reflection of a mirror? Should I measure the distance from the mirror to the object, and then from the mirror to the camera and add them together? or measure just to the mirror?
  • 0

#2 Adrian Sierkowski

Adrian Sierkowski
  • Sustaining Members
  • 7375 posts
  • Cinematographer
  • Los Angeles, Ca

Posted 14 February 2008 - 01:27 AM

I had to do this on a bolex once. If i recall correctly, I measured from the mirror to the camera. I was working at an F4 or so and It came out well enough (most people thought it was a window, not a mirror, though, but that's filmschool). Working at a higher stop will help, if you can (and you want to meter what's reflected in the mirror not just the mirror itself, obviously) as the DoF will help sharpen things if you're a bit off.
  • 0

#3 Satsuki Murashige

Satsuki Murashige
  • Sustaining Members
  • 3510 posts
  • Cinematographer
  • San Francisco, CA

Posted 14 February 2008 - 02:00 AM

I have a film camera without a reflex viewfinder...so I've had to resort to using a tape measure for my first film shoot at school to achieve sharp focus. How should I go about focusing on something in the reflection of a mirror? Should I measure the distance from the mirror to the object, and then from the mirror to the camera and add them together? or measure just to the mirror?

Your first instinct is correct - measure from the camera's focal plane to the mirror and then from the mirror to the object. The sum of the two measurements will be the correct distance for focus.
  • 0


Gamma Ray Digital Inc

Willys Widgets

Technodolly

Visual Products

Media Blackout - Custom Cables and AKS

Abel Cine

Rig Wheels Passport

Aerial Filmworks

CineLab

Glidecam

Tai Audio

Broadcast Solutions Inc

Ritter Battery

CineTape

FJS International, LLC

rebotnix Technologies

Metropolis Post

The Slider

Paralinx LLC

Wooden Camera

New Pro Video - New and Used Equipment

Willys Widgets

Rig Wheels Passport

Paralinx LLC

Tai Audio

Aerial Filmworks

Glidecam

Wooden Camera

Metropolis Post

Media Blackout - Custom Cables and AKS

FJS International, LLC

Abel Cine

CineTape

New Pro Video - New and Used Equipment

CineLab

Broadcast Solutions Inc

rebotnix Technologies

Gamma Ray Digital Inc

Technodolly

The Slider

Ritter Battery

Visual Products