Campbell CCFC Field Camera, Instruction Manual

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CCFC Field Camera
16

Automatic focus
The zoom and focus can be adjusted through the web interface
(see Section 12.5
Lens Position).
7.5.1 Camera Lens and Field of View
The CCFC includes a 4.7 - 64.6 mm lens, which provides an
approximate 4
°
horizontal field of view when fully zoomed in and
a 67.3
° horizontal field of view when fully zoomed out.
The
aperture size is F/1.6 to F/2.8.
7.5.2 Camera Auto Focus
The auto focus occurs before each capture to ensure photo quality
and compensates for any variations due to temperature or other
external factors. The auto focus can also be used through the web
interface’s
Live Preview for photo capture. The auto focus occurs
with each manual zoom action, when adjusting the zoom position
from the web interface. If the auto focus fails, the lens returns to
the best position to ensure photo quality. If the camera is in an
extremely dark environment, the auto focus will use the last
position that was in focus to perform the capture.
The auto focus operation attempts to focus on the most distant
object in the field of view. For example, in a scene with
mountains in the background and a tree in the foreground, the
camera will focus on the mountains.
7.5.3 Temperature Variations and Focus
The focus of the lens can change slightly with large variations in
temperature. For example, if a lens is focused at +35°C, the lens
may be slightly out of focus at -40°C. The change in focus will be
less noticeable if the focus is adjusted closer to the camera’s
operating temperature.
Some lens options are unavailable when working in the extreme
cold. The zoom function disables below -30
°
C and the focus
function disables below -35
°
C. Note that these thresholds are
based on camera internal temperatures, which can be several
degrees warmer than ambient outdoor temperate. The camera will
continue to capture photos and video as set up, but the zoom and
focus features will not function. Check the internal temperature of
the camera using the
Dashboard of the web interface (see Section
12.3 Dashboard ).