Jump to content


Photo

Lenses going bad.


  • Please log in to reply
4 replies to this topic

#1 Hans Engstrom

Hans Engstrom
  • Basic Members
  • PipPipPip
  • 195 posts
  • 1st Assistant Camera
  • Sweden

Posted 16 May 2006 - 02:44 PM

What beside dropping and heavily abusing a lens can make it go bad? I had a 35mm today that wasn´t sharp according to the scale. It has been sharp earlier but when I measured it after watching soft dailies it´s 25cm off at 2m. Me and the dp are the only one that handle the equipment. The only time it´s under someonelses supervision is during lunch. I have made a new focusring and going to get the lens replaced asap.
  • 0

#2 Adam Frisch FSF

Adam Frisch FSF
  • Sustaining Members
  • 2009 posts
  • Cinematographer
  • Los Angeles, USA

Posted 16 May 2006 - 04:09 PM

Extreme temperatures could theoretically do that, but I actually haven't heard of that happen very often. It could just be that an element, or the focus ring, has slightly slipped or gone out of place. Some lenses can let an element go when you tilt them too much, or if they've been in a very shaky environment on a truck or a car mount, for instance.
  • 0

#3 Hans Engstrom

Hans Engstrom
  • Basic Members
  • PipPipPip
  • 195 posts
  • 1st Assistant Camera
  • Sweden

Posted 16 May 2006 - 04:46 PM

Thanks for the reply. This movie is shot with handcamera running around like crazy all the time and shaking the camera so perhaps that can be the reason. It´s horrible watching doft dailies with the DP and director, and the director was satisfied with the performances from the actors so I´m going to have to live with those soft shots for the rest of my life:(
  • 0

#4 Dan Goulder

Dan Goulder
  • Sustaining Members
  • 1259 posts
  • Cinematographer

Posted 16 May 2006 - 05:51 PM

Always trust your eye first, lens markings second. Be especially sure that your back focus isn't off, or your shots at infinity will be soft.

Edited by dgoulder, 16 May 2006 - 05:53 PM.

  • 0

#5 Hans Engstrom

Hans Engstrom
  • Basic Members
  • PipPipPip
  • 195 posts
  • 1st Assistant Camera
  • Sweden

Posted 16 May 2006 - 06:02 PM

Agree. Thats why I hate working with 35mm adapters on videocameras when not having an optical viewfinder or hi-res monitor on set. With a optical viewfinder this would easily have been avoided as not even the first actor that I just measured the distance to is in focus.
  • 0


Broadcast Solutions Inc

Technodolly

Glidecam

rebotnix Technologies

CineLab

Ritter Battery

Paralinx LLC

Metropolis Post

Rig Wheels Passport

Abel Cine

The Slider

CineTape

Visual Products

Gamma Ray Digital Inc

Aerial Filmworks

FJS International, LLC

Opal

Wooden Camera

Media Blackout - Custom Cables and AKS

Willys Widgets

Tai Audio

Glidecam

Gamma Ray Digital Inc

Tai Audio

Abel Cine

Aerial Filmworks

Ritter Battery

Paralinx LLC

Opal

Technodolly

Rig Wheels Passport

rebotnix Technologies

Willys Widgets

CineTape

Media Blackout - Custom Cables and AKS

CineLab

Metropolis Post

Wooden Camera

FJS International, LLC

Broadcast Solutions Inc

The Slider

Visual Products