Jump to content


Photo

new ASA rating for Z1 with Mini35


  • Please log in to reply
1 reply to this topic

#1 Nadav Hekselman

Nadav Hekselman
  • Basic Members
  • PipPip
  • 68 posts
  • Cinematographer

Posted 01 January 2007 - 09:05 AM

Hi all,

Im about to start shooting a drama-short using the mini35 adaptor and HDV-Z1.

i rated the camera at about 160 ASA but when i put on the Adaptor i have to zoom in to full tele and i end up with 2.8f on the Z1 lens. how should i rate the camera now than?

It seems logical to me that if the most open iris on the Z1 is 1.6 and i take it down to 2.8, i lose 1 and 2/3 stops, which take the 160 ASA down to 50 ASA, and i use the 35 lenses iris for calcualting... but this doesnt seem right when i measure the light. it seems overexposed. i guess the adaptor itself takes out some light and i need to rate it even less.... cant find nothing about it on p+s technick site...

can anyone help?
  • 0

#2 Matt Sandstrom

Matt Sandstrom
  • Basic Members
  • PipPipPipPip
  • 464 posts
  • Director
  • Stockholm, Sweden

Posted 01 January 2007 - 05:38 PM

you mean it seems underexposed, right? anyway, just use whatever asa setting that works. shoot a grey card and check the levels if you're uncertain. there's no mathematical formula that can ever give you the correct light loss factor of a 35mm adapter.

also, a much better strategy for using such an adapter is to set the f-stop on the 35mm lens to a fixed number and adjust the camera aperture instead. much more control without any weird dof changes, plus at some apertures you may start seeing the grain in the ground glass.

/matt
  • 0


Media Blackout - Custom Cables and AKS

The Slider

rebotnix Technologies

Technodolly

Broadcast Solutions Inc

Ritter Battery

CineLab

Tai Audio

Willys Widgets

Visual Products

Glidecam

Rig Wheels Passport

Abel Cine

CineTape

FJS International, LLC

Gamma Ray Digital Inc

Paralinx LLC

Opal

Wooden Camera

Aerial Filmworks

Metropolis Post

Glidecam

Ritter Battery

rebotnix Technologies

Opal

Willys Widgets

Paralinx LLC

Metropolis Post

Aerial Filmworks

Tai Audio

Rig Wheels Passport

Wooden Camera

FJS International, LLC

CineLab

Gamma Ray Digital Inc

The Slider

CineTape

Visual Products

Abel Cine

Technodolly

Broadcast Solutions Inc

Media Blackout - Custom Cables and AKS