Metering System

With the T90, the metering mode, i.e. the metering sensitivity pattern, can be changed regardless of which lens you use or the subject you are shooting.

*Do not use a linear polarization filter.

Center-weighted Average Metering

This is a convenient metering system for general photography under normal shooting conditions. The meter measures the entire viewing area, emphasizing the central portion where the subject is most likely to be and diminishing toward the edges.

(Metering sensitivity distribution pattern)

(When using FD 50mm f/1.4 lens)

Partial Metering

This system with its 13% coverage of the field of view, allows you to meter only the central portion of the image in the viewfinder. It is particularly effective for metering backlit subjects, such as a person in front of a bright window.

(Metering sensitivity distribution pattern)

(When using FD 50mm f/1.4 lens)

Spot Metering

Spot metering is ideal for subjects which require precise measurement. Since the metering area is 2.7% of the field of view. you can select a small, exact area from the overall scene. It is especially advantageous for stage photography, photomacrography and photomicrography.

(Metering sensitivity distribution pattern)

(When using FD 50mm f/1.4 lens)

Optical System for Finder
Light Metering System

Center-weighted average metering and partial metering are measured by a double-area sensitivity silicon photo cell placed above the viewfinder eyepiece.

Spot meterin is measured by anothther silicon photo cell placed in the lower part of the mirror box. During spot metering, light coming through the lens is intercepted by a sub-mirror, functioning as a half-mirror. From here, it is directed to the spot metering cell, where the center portion of the field of view is measured, providing the basis for spot metering exposure calculations. This silicon metering cell is also used for A-TTL and TTL flash metering with the 300TL and ML-2 Flash units.

Sign My Guestbook View My Guestbook

To post queries about your T90 camera and other related gear,
go to the Malaysian T90 Website or click here.

This website is not sponsored in any way by Canon Inc.
®Canon is a registered trademark of Canon, Inc.