Jump to content


Photo

B4 mount, flange focal distance measurement.


  • Please log in to reply
2 replies to this topic

#1 Gregg MacPherson

Gregg MacPherson
  • Basic Members
  • PipPipPipPip
  • 1880 posts
  • Other
  • New Zealand

Posted 21 September 2010 - 05:58 AM

In case this question got lost or wasn't well identified in my other post, I thought I'd try with a better title.
If I have a B4 mount lense but no camera mount or adaptor, where on the lense flange do I measure the flange focal distance from?
Cheers
Gregg.
  • 0

#2 Dom Jaeger

Dom Jaeger
  • Basic Members
  • PipPipPipPip
  • 1597 posts
  • Other
  • Melbourne, Australia

Posted 22 September 2010 - 02:55 AM

The flange focal depth or distance is measured from the camera mount/rear of the lens mount flange to the film plane.
  • 0

#3 Gregg MacPherson

Gregg MacPherson
  • Basic Members
  • PipPipPipPip
  • 1880 posts
  • Other
  • New Zealand

Posted 22 September 2010 - 05:56 AM

Thanks Dom,
Just to be really clear. The flange on the lense has three wings or tangs that stick out, then it's steped down to a smaller diameter behind this. I thought that flange focal distance would probably be measured from the rear of the flange with wings on it, but wanted to make sure that it wasn't from the rear of the steped down flange.

Like I said in my other post, I was curious to clamp this lense (Canon J15x9.5B ) on a bench in front of my Eclair ACL. I don't know if it will properly cover the frame and I don't know how sharp it can be.

Cheers
Gregg

Edited by Gregg MacPherson, 22 September 2010 - 05:58 AM.

  • 0


Willys Widgets

Aerial Filmworks

Paralinx LLC

Abel Cine

Media Blackout - Custom Cables and AKS

Gamma Ray Digital Inc

FJS International, LLC

The Slider

Wooden Camera

Visual Products

Glidecam

Rig Wheels Passport

CineTape

rebotnix Technologies

Metropolis Post

CineLab

Technodolly

Opal

Ritter Battery

Broadcast Solutions Inc

Tai Audio

Broadcast Solutions Inc

Media Blackout - Custom Cables and AKS

Abel Cine

Aerial Filmworks

rebotnix Technologies

FJS International, LLC

Rig Wheels Passport

CineLab

Glidecam

The Slider

CineTape

Opal

Metropolis Post

Gamma Ray Digital Inc

Technodolly

Ritter Battery

Willys Widgets

Tai Audio

Paralinx LLC

Wooden Camera

Visual Products