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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.

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.

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.

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.

Optical System for Finder Light Metering System

 

Optical System for Finder Light Metering System

 

 

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