The Overview Mode; Viewing Modes; Semi-Colours; Auto-Focus On/Off - Optelec Sentry+ User Manual

Optelec

The overview mode

By pressing the overview key you can activate a crosshair
target on the visual screen, which shows you the centre of
the image of the camera. By pressing this key twice the
crosshair target will disappear.

Viewing modes

Pressing this button will cycle you through three viewing
modes:
1- Full Colour Photo mode
This mode will display text, pictures and objects in full colour.
2- Positive Reading mode
This mode enhances the foreground / background contrast. Pictures
and text will be displayed in black text on a white background.
3- Negative Reading mode
This mode reverses the positive image.
displayed as white text on a black background.

Semi-colours

You can activate this function in the Positive and Negative
Reading Modes only. Pressing this button cycles you
through a wide range of different foreground and background colour
combinations. You may choose to display text in a pair of selectable
colours when more contrast is needed or when alternate colour
combinations provide easier reading.
Auto-focus On / Off
+
The Sentry [HD] features automatic focusing to produce a
clear image at any time. When the auto-focus is not active
the red LED indicator will illuminate. Press this button to switch to
Focus Lock which stops the Sentry
focusing. This is useful for tasks such as writing, painting or
enjoying craftwork. Pressing this button will re-activate the auto-
focus and the red LED indicator light will turn off again.

Contrast

The contrast changes with the adjustment button, which is
presented on the right. Rotating this button counter
clockwise decreases the contrast and rotating the button
clockwise increases the contrast.
English
Sentry
Pictures and text will be
+
[HD] from continuously
+ +
/ Sentry HD
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