Mirror Shutter, Fiber Optic Screen, Field Lens

z light path inside camera body

zlight path inside viewfinder

uMirror Shutter

A half-moon shaped mirror rotates in front of the film gate at the camera speed. Half of the time the mirror covers the film and the light from the taking lens is reflected up into the viewfinder. During that time, the film is transported one frame further. The other half of the time the mirror leaves the light path open, so the light from the taking lens is projected onto the film, exposing an image. Since the mirror's function is to both reflect and shutter light, it is known as a "mirror shutter".

vFiber Optic Screen

The light from the lens is projected onto a screen (a fiber optic screen in the 416 cameras), which acts as a rear projection screen. This is where the viewfinder image forms.

wField Lens

The field lens (named as such because located close to the image field) refracts the light into the entrance pupil of the primary viewfinder lens and the video assist lens.

xVideo Assist Beam Splitter 80% of the light passes straight up, while 20% is reflected to the side and projected through the video assist optics (not pictured) onto the video assist CCD sensor.

ySupplementary Lens

UProtective Glass

An optically clear glass plate on the top surface of the camera body pro- tects the components underneath from dirt contamination.

VSupplementary Lens

WARRIGLOW LED Module Red green and blue LEDs are situ- ated on an electronics board above the partial mirror.

XPartial Mirror

The light from the fiber optic screen is reflected into the viewfinder.

At the same time, the light from the ARRIGLOW LEDs above is let through. This light is then reflected off the frame line markings on the fiber optic screen, providing illumi- nated frame lines when needed.

at 90 Degree Prism

ak Primary Lens

Picks up the image from the fiber optic screen.

al Mirror

am Pechan Prism Automatically keeps the image upright when the viewfinder is rotated. Also allows for manual image rotation.

an Secondary Lens

Provides the image for the eyepiece. ao Mirror

ap Protective Glass

Located at the mechanical interface to the eyepiece or eyepiece extension, this protective glass prevents dust from getting into the viewfinder optics.

aq Eyepiece

The eyepiece allows the operator to view the image. It also provides a focus adjustment of approximately +/- 3 diopters.