Manual

Controlling image capture

MARLIN Technical Manual V2.4.0

122

The minimum adjustable exposure time set by register is 20 µs.  The real

minimum exposure time of a Marlin F-033 is then:

20 µs + 12 µs = 32 µs

Extended shutter

The exposure time for long-term integration of up to 67 seconds can be

extended via the advanced register: EXTENDED_SHUTTER

The longest exposure time, 3FFFFFFh, corresponds to 67.11 sec.

The lowest possible value of ExpTime is camera-specific (see Table 44: Cam-

era-specific minimum exposure time on page 121).

0xF100020C EXTD_SHUTTER Presence_Inq [0] Indicates presence of this feature (read

only)

--- [1.. 5] Reserved

ExpTime [6..31] Exposure time in µs

Table 46: Advanced register: extended shutter

Note

• Exposure times entered via the 81Ch register are mir-

rored in the extended register, but not vice versa.

• Longer integration times not only increase sensitivity,

but may also increase some unwanted effects such as

noise and pixel-to-pixel non-uniformity. Depending on

the application, these effects may limit the longest

usable integration time.

• Changes in this register have immediate effect, even

when the camera is transmitting.

• Extended shutter becomes inactive after writing to a

format/mode/frame rate register.