Jump to content


Photo

Gate and Ground glass question


  • Please log in to reply
8 replies to this topic

#1 chooser

chooser
  • Basic Members
  • PipPip
  • 46 posts
  • Director

Posted 18 October 2009 - 08:02 AM

Looking at an older Arri BL3 and was wondering if someone would be so kind as to clarify a couple of points for me.

I have attached two photos.

1: The gate appears to be a full Aperture Standard 4 perf frame.
2: The ground Glass appears to be a 1:1,37 Academy Aperture


What would I need to do to shoot Super 35mm on this camera?

1: Change the gate?
2: Change the ground glass?
3: Realign / re-center of the PL mount/flange?

Any tips, advise, pointers, direction appreciated.

Regards Chooser

Attached Images

  • GATE.jpg
  • GLASS_2.jpg

  • 0

#2 chooser

chooser
  • Basic Members
  • PipPip
  • 46 posts
  • Director

Posted 19 October 2009 - 06:04 AM

OK ... Arri Munich called and they can do it.

I was just hoping some one might know of a company in the US who could do the it for me.

Any leads appreciated.

Thanks C
  • 0

#3 John Sprung

John Sprung
  • Sustaining Members
  • 4635 posts
  • Other

Posted 19 October 2009 - 01:07 PM

Given that the gate is full aperture, the only thing you need to do is swap out the ground glass. I haven't done that on an early BL, but on most cameras, it's something that an AC can do on location. All you need is the GG that you want. Arri apparantly still has them, so all you need to do is have one little package shipped to you rather than sending the whole camera there and back. An old equipment dealer such as Visual Products might also have the GG. If you're in the LA area, you might ask Clairmont..... Shoot an alignment chart when you get the new GG in, just to be sure that it's right.




-- J.S.
  • 0

#4 William Coss

William Coss
  • Basic Members
  • PipPip
  • 37 posts
  • 1st Assistant Camera

Posted 22 October 2009 - 09:29 PM

And center the mount to full ap.

Wilhelm
  • 0

#5 Tom Jensen

Tom Jensen
  • Basic Members
  • PipPipPipPip
  • 1234 posts
  • Camera Operator
  • Dallas, TX

Posted 22 October 2009 - 10:27 PM

I'd call Otto Nemenz or Ken Stone in LA.
  • 0

#6 John Sprung

John Sprung
  • Sustaining Members
  • 4635 posts
  • Other

Posted 23 October 2009 - 12:36 AM

And center the mount to full ap.


Take a look at it. If the gate is factory original full ap, the mount is usually also centered on full ap. The offset is big enough to see just by eye if you look carefully.





-- J.S.
  • 0

#7 Anna Martin

Anna Martin

    New

  • Basic Members
  • Pip
  • 3 posts
  • Other

Posted 01 November 2009 - 05:54 PM

Take a look at it. If the gate is factory original full ap, the mount is usually also centered on full ap. The offset is big enough to see just by eye if you look carefully.





-- J.S.



Really?
  • 0

#8 John Sprung

John Sprung
  • Sustaining Members
  • 4635 posts
  • Other

Posted 02 November 2009 - 03:57 AM

Really?

Yes. IIRC, the offset is something close to a sixteenth of an inch. The mount face and aperture plate are far enough apart that you have to be careful to look at it square on, but if you do, you can definitely tell by eye.





-- J.S.
  • 0

#9 James Steven Beverly

James Steven Beverly
  • Basic Members
  • PipPipPipPip
  • 4199 posts
  • Director
  • El Paso, Texas

Posted 03 November 2009 - 01:23 AM

Regards Chooser


Chooser, no one else has mentioned it so I will, this being a forum created, maintained, ran and catering to film professionals and you must use your real name here as per forum rules. You can change "chooser" to your real name and comply by going to My Controls.
  • 0


Broadcast Solutions Inc

Rig Wheels Passport

Willys Widgets

Technodolly

Wooden Camera

Abel Cine

Visual Products

Ritter Battery

Opal

Aerial Filmworks

FJS International, LLC

Glidecam

Metropolis Post

The Slider

Paralinx LLC

CineLab

Tai Audio

CineTape

rebotnix Technologies

Gamma Ray Digital Inc

Media Blackout - Custom Cables and AKS

Ritter Battery

Rig Wheels Passport

Aerial Filmworks

Tai Audio

Willys Widgets

Glidecam

Technodolly

The Slider

Wooden Camera

rebotnix Technologies

Opal

Gamma Ray Digital Inc

Abel Cine

Paralinx LLC

CineLab

Visual Products

CineTape

Broadcast Solutions Inc

FJS International, LLC

Metropolis Post

Media Blackout - Custom Cables and AKS