Instruction manual
Marlin Technical ManualV.2.7.0
146
Controlling image capture
The minimum adjustable exposure time set by register is 20 μs. The real min-
imum 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 69: Camera-
specific minimum exposure time on page 145).
Register Name Field Bit Description
0xF100020C EXTD_SHUTTER Presence_Inq [0] Indicates presence of this feature (read
only)
--- [1.. 5] Reserved
ExpTime [6..31] Exposure time in μs
Table 71: Advanced register: extended shutter
Note
• Exposure times entered via the 81Ch register are mirrored
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 for-
mat/mode/frame rate register.