Jump to content


Photo

Konvas focusing


  • Please log in to reply
3 replies to this topic

#1 Clive Alex

Clive Alex
  • Basic Members
  • PipPip
  • 45 posts
  • Director
  • Cumbria, England

Posted 07 April 2011 - 04:31 PM

I recently used a ground glass over the film gate to check the focusing of two Konvas 2m's and found the viewfinder and film gate are slightly out of sync with one another on both cameras when focusing on a stationary subject. Do they need calibrated or is there a reason for this?

Edited by Clive Alex, 07 April 2011 - 04:32 PM.

  • 0

#2 Olex Kalynychenko

Olex Kalynychenko
  • Basic Members
  • PipPipPipPip
  • 868 posts
  • Cinematographer
  • Dnepropetrovsk, Ukraine

Posted 08 April 2011 - 03:08 AM

I recently used a ground glass over the film gate to check the focusing of two Konvas 2m's and found the viewfinder and film gate are slightly out of sync with one another on both cameras when focusing on a stationary subject. Do they need calibrated or is there a reason for this?


Are the slightly out of sync too much ?
This is very important for you ?
The nonregistration at horizontal or vertical level ?

The ground glass of Konvas-1M, 2M made at one surface of angle prism.
This is prism set inside prism house.
The prism house jam on plate of mechanism by two pins and two screws.
The prism house position adjust on factory and do not adjustable at time of use.
But, the position of prism with ground glass can be adjust inside prism house by adjustable sheet layers.

The camera technician must have special standard film gate with scale and measuring microscope.

I think, you must worry about flange focal distance adjusting and correct adjusting of shutter disk, because, this is influence on quality of footages directly.

Can send me questions by PM
  • 0

#3 Jonathan Bowerbank

Jonathan Bowerbank
  • Basic Members
  • PipPipPipPip
  • 2815 posts
  • 1st Assistant Camera
  • San Francisco, CA

Posted 08 April 2011 - 03:18 AM

I'm so glad a Russian was the first to respond to this :lol:
  • 0

#4 Clive Alex

Clive Alex
  • Basic Members
  • PipPip
  • 45 posts
  • Director
  • Cumbria, England

Posted 23 April 2011 - 03:04 PM

After checking the lens mount, prism and ground glass I found the ground glass to be the problem. I've adjusted the ground glass on both Konvas's and they're fine now.
  • 0


Broadcast Solutions Inc

Gamma Ray Digital Inc

Technodolly

Aerial Filmworks

Visual Products

Wooden Camera

Glidecam

Opal

Metropolis Post

Abel Cine

The Slider

FJS International, LLC

Tai Audio

CineTape

rebotnix Technologies

Willys Widgets

Media Blackout - Custom Cables and AKS

Ritter Battery

Paralinx LLC

CineLab

Rig Wheels Passport

rebotnix Technologies

Rig Wheels Passport

FJS International, LLC

Gamma Ray Digital Inc

Wooden Camera

Media Blackout - Custom Cables and AKS

CineLab

Broadcast Solutions Inc

Paralinx LLC

Willys Widgets

The Slider

Metropolis Post

Abel Cine

Technodolly

CineTape

Glidecam

Aerial Filmworks

Tai Audio

Visual Products

Opal

Ritter Battery