Jump to content


Photo

PRO35 backfocus keeps running


  • Please log in to reply
1 reply to this topic

#1 weiming

weiming
  • Basic Members
  • PipPip
  • 13 posts
  • 2nd Assistant Camera
  • singapore

Posted 20 March 2007 - 12:52 AM

Hi all,

anyone has the same experience of the pro35 backfocus running everytime u change a lens?
i had this experience, and we had to constantly adjust the backfocus with every lens change. we ensured that the pro35 was mounted properly onto the camera and all support rods were in place.

Camera used was a varicam w/ ultra primes and a chroziel light-weight follow-focus.

One other thing i noticed was that when u racked focus, the pro35 unit would shift slightly. is this normal?

thx for your help!
  • 0

#2 Mitch Gross

Mitch Gross
  • Basic Members
  • PipPipPipPip
  • 2873 posts
  • Cinematographer

Posted 20 March 2007 - 11:12 AM

I think you need to have your gear checked. The Pro35's beckfocus is a relationship between it and the camera. On a large HD monitor you should be able to see when the backfocus is correctly set. If the Pro35 physically moves on its mount (it is mounted on the camera and you can shift it around a bit) than that means that some internal mounting screws near the back need to be tightened. PLEASE DON'T TRY TO DO THIS YOURSELF! Take it back to the rental house and have them do it. After all that, if different lenses require different backfocus, then that means that they are not collimated properly and need to be reset by the rental house.
  • 0


Glidecam

Ritter Battery

FJS International, LLC

CineLab

Gamma Ray Digital Inc

Metropolis Post

The Slider

CineTape

Tai Audio

Media Blackout - Custom Cables and AKS

Opal

Abel Cine

rebotnix Technologies

Wooden Camera

Visual Products

Rig Wheels Passport

Willys Widgets

Broadcast Solutions Inc

Aerial Filmworks

Paralinx LLC

Technodolly

Media Blackout - Custom Cables and AKS

FJS International, LLC

Abel Cine

Ritter Battery

CineTape

Broadcast Solutions Inc

Visual Products

Metropolis Post

Paralinx LLC

rebotnix Technologies

Opal

Glidecam

Rig Wheels Passport

Aerial Filmworks

Technodolly

Gamma Ray Digital Inc

Tai Audio

The Slider

CineLab

Wooden Camera

Willys Widgets