Modern Classic SLRs Series :
Canon T90 - Camera Instruction Manual

Part XXI

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Other Notes


1. Liquid Crystal Display

The T90's display panel uses liquid crystal to display exposure information. After about 5 years of normal use, the display may become hard to read.
The liquid crystal may respond relatively slowly in low temperatures and the display may become dark at high temperatures (about 60°C/140°F). Normal functioning will return when the temperature returns to normal.



2.
Back-up Battery

The T90 has a built-in back-up battery which memorizes the display panel data, such as the frame counter number and the ISO film speed, when the AA-size batteries are being changed. Battery life is about 5 years. When voltage becomes insufficient, "lSO 100" will blink (at 2 Hz) on the display panel after loading batteries for normal camera operations. If the back-up battery is removed, the memory will be erased. In this case, reset the film speed.

Take your camera to the nearest Canon Service facility for the replacement of the liquid crystal or the back-up battery. (Replacement will be at owner's expense.)


3.
Batteries

Even if one blinking bar mark or no bar mark appears on the display panel during batter~ check, indicating that the batteries are low as long as the shutter releases exposure wil be correct. Automatic rewind, however, ma~ not be possible because of the insufficienl power of the batteries. Also, if the camera happens to stop during rewind, all of the film transport bars start blinking on the display panel to warn you. Automatic rewind will starl again once you replace the batteries with the new ones.

4.
HELP Display

"HELP" may appear in the viewfinder in the case of camera malfunction or operational error warning. When "HELP" is displayed'perform the following operations:

1 ) Check the batteries by pressing the battery check button inside the palm wing.
2) If the battery voltage is sufficient, remove the battery magazine once and reset it.
3) Release the shutter once.

If "HELP" does not appear again the camera has returned to normal condition and you can keep shooting. If "HELP" will not disappear after repeating the operation described above several times, there has been a camera malfunction and the camera needs repair. Take the camera to the nearest Canon Service facility.

On the display panel, the error display (EEE) will appear while the "HELP" is displayed in the viewfinder.
The "HELP" and "EEE" displays will appear even when the viewfinder display selector is turned off.

5.
When Using the Canon Extenders
Exposure compensation may be necessary when using the Canon Extenders with the T90. Correct the exposure by using the exposure compensation index as follows:

Extender

Lens

The Max aperture of the lens

T90's metering mode

Center-weighted average

Partial

Spot

2X-A

Single

All lenses

0

-2/3 step

-2/3 step

Zoom

All Lenses

0

-2/3 step

-1/3 step

2X-B

Single

f/1.2-f/2.0

+2/3 step

+2/3 step

+1/3 step

f/2.5-f/2.8

+2/3 step

0

0

f/3.5 or slower

0

0

0

Zoom

All lenses

+1/3 step

-1/3 step

0

1.4X

Single

All lenses

0

-2/3 step

-2/3 step

Zoom

All lenses

0

0

0

* "+" means increasing the exposure
* "-" means decreasing the exposure


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Credit: EeWyn, my nephew, who has spent quite a number of nights preparing the manual in HTML format. Mr Richard Yeow, General Manager -Optical Division of Canon Marketing for granting permission to reproduce this manual in this site. my staffs Miss Wati and Mirza for helping the basic setup work. We had some good times together... except no KFC and Pizza for dinners.