Canon T 90 - Manual (Page 107)

Fixed dot (the value stored into memory) —
I e S s ► a
When the spot metering button is pressed,
the exposure value is kept locked in the cam­
era’s memory for 30 secs after you have re­
moved your finger.
The exposure value stored into memory in
the spot metering mode is cleared under the
following conditions:
1
.
3.
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.
When the metering mode seiector is
pressed.
When the finger is removed from the shut­
ter button after exposure.