P.105, On (p.105), P.105) – Pentax K-m/K2000 User Manual

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Set Exposure Steps in [1. EV Steps] in the [A Custom Setting 1] menu
(p.78) to increments of 1/2 EV or 1/3 EV.

AE Lock is a function that memorizes the exposure prior to taking a
picture. Use this when the subject is too small or backlit and a proper
exposure setting cannot be obtained.

Select [AE Lock] in [9. AF
Button function] in the
[A Custom Setting 2] menu.

Press the = button.

The camera memorizes the exposure
(brightness) at that instant.
@

is displayed in the status screen and

viewfinder while the AE lock is
engaged.
Press it again to unlock.

Changing the Exposure Steps

Recording the Exposure Before Shooting (AE Lock)

1. EV Steps

Exposure setting steps
are set to 1/2 EV

1/2 EV Steps
1/3 EV Steps

9. AF Button function

Enable AF1
Enable AF2
Cancel AF
AE Lock

AF button is assigned
to AE Lock function