Modern Classic SLRs Series :
Canon T90 - Camera Instruction Manual

Part XIII

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Intermediate Operation

Shooting with the Lens Set on "A" Mark.

Spot Metering
 

The spot metering can be used in the following three ways:

1 One-point spot metering
2 Multi-spot metering
3 H/S control

When the shutter button is pressed halfway, the AE lock function works as in the partial metering mode, and the sequential AE lock photography is also possible.

1. One-point spot metering
Only one point is measured in the viewfinder.

1 ) Put the main subject in the center of the viewfinder so that the spot metering mark covers it.

2) Press the spot metering button. As shown in the photo on the right page, when you want to take a picture of a glass backlit by a bright window, press the spot metering button so that it covers the.glass. (When the subject transmits light exposure compensation is necessary,)

When the spot metering button is pressed, both the shutter speed and the aperture are displayed at the bottom of the viewfinder. The fixed dot (<) will then appear at the position of the triangle index on the right of the viewfinder.
When the spot metering button is pressed, the exposure value is kept locked in the camera's memory for 30 sees after you have removed your finger.

The exposure value stored into memory in the spot metering mode is cleared under the following conditions:

1. When more than 30 secs. have elapsed without releasing the shutter after the spot metering button has been pressed and the finger has been removed.

2. When the metering mode selector is pressed.

3. When the finger is removed from the shutter button after exposure.


One-point spot metering is also possible by pressing the shutter button halfway. In this case, however, the exposure value is not stored into memory. When you remove your finger from the shutter button, the exposure value is cleared.




< Exposure Level Difference Comparison >
When you move the spot metering mark to another point of the subject after the spot metering button has been pressed, the new metering value (<) will appear to the right of the viewfinder as a free dot. You can check the exposure level difference between the main subject (stored into memory by the fixed dot) and another point of the viewfinder, that exists in the scene before pressing the shutter button.

The free dot moves in the range of +4 steps. If the exposure level difference is +4.5 steps or more, the "~" (+) or "~" ( - ) indicator will be displayed instead of the "~" dot.
In most cases, exposure compensation is necessary for the one-point spot metering. Please read the column of "H/S control", too.

In order to obtain correct exposure in the onepoint spot metering, factors such as subject contrast pattern, reflectivity and latitude of the film in use must be carefully considered.



2.Multi-spot metering
Several points can be measured in the scene in the viewfinder, taking your measuring reference point into account.
1) As shown in the photo above, when you want to obtain correct exposure on her face and also want to obtain correct exposure on the background, press the spot metering button twice on her face and once on the background.

2) The final exposure is made by averaging each exposure value of the three points. The emphasis of the exposure is put on her face since it is metered twice and the correct exposure can be obtained, while even the exposure on the background can be maintained since it is metered once.

The digital values of both the shutter speed and the aperture appearing at the bottom of the viewfinder are sequential weighted averages calculated each time a point is metered.

The triangle index in the center of the righthand LCD is also used as the center point around which the other readings also marked by the "~" dot are divided.

When three points are measured, three fixed dots are displayed finally.

The exposure value stored into memory in the multi-spot metering mode is cleared under the following conditions:

1. When more than 30 sees have elapsed without releasing the shutter after the spot metering button has been pressed last.
2. When the metering mode selector is pressed.
3. When the finger is removed from the shutter button after exposure.

Multi-spot metering is only possible by pressing the spot metering button unlike the one-point spot metering.

Up to eight points can be metered using the multi-spot metering. Subsequent attempts will be disregarded.


3. H/S Control

"H" stands for "highlight" and is used when the subject is white, while "S" stands for "shadow" and is used when it is black.

The H/S control can be used with both the one-point spot metering and the multi-spot metering. Here is how to use the H/S control in the one-point spot metering explained in consideration of its application.


< Highlight Control >
1) Press the spot metering button to indicate the fixed dot at the position of the triangle index. 2) When the highlight control button at the upper back of the camera is pressed and released, the dot starts moving upward to make compensation. Set the desired amount of compensation according to how bright the subject is.


< Shadow Control >
1) Press the spot metering button to indicate the fixed dot at the position of the triangle index. 2) When the shadow control button next to the highlight control button is pressed and released, the dot starts moving downward to make compensation. Set the desired amount of compensation according to how dark the subject is.



Highlight Control Examples

0

+2

+2.5




Shadow Control Examples

0

-1

-2

*figures indicate the amount of explosure compensation

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Credit: Mr. Richard Yeow, General Manager -Optical Division of Canon Marketing, Tony Kano, former regional head of Canon in Asean Region, for granting special permission to reproduce this manual into HTML format in his site as a form of obligation to all the T90 users worldwide. Pawel Nabe for his image on the Data Memory Back. EEwyn Foo, my nephew, who has spent quite a number of nights converting the original manual in HTML format. Maintenance Team: Kaipin, Terry Carraway & Dr Strangelove; Tom Scott, for his images of the SPD cell, Chris Tutti for his initial effort to scan and prepared the T90 manual in PDF format. My staffs Miss Wati and Mirza for helping the basic setup work. * Canon, T90, FD Lenses, Canon Marketing are registered trade names or trademarks of Canon Inc. Japan.

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