while capturing the master dark frames and you should not use the ‘Scale mean of each
frame to first?’ option because there should be no light fluctuations between frames
(which is what this setting standardises for).
Figure 7.3 Some master dark images (each is a 64 frame average) taken with the AF51. On the
left
of each
row the acquisition used the Y-channel of the YUYV camera stream. On the
right
of each row the acquisition
used the Intensity channel from a YUYV-to_RGB transform still using the YUYV output from the camera.
Top
: Exposure setting of 1269.
Middle
: Exposure setting ‘night mode’ maximum frame integrations.
Bottom
:
Close up of the small flare seen in the middle panel. Such small imperfections in the pixel read out amplifiers
are not unusual and this is part of the fixed pattern dark field ‘noise’ which dark field subtraction is designed
to correct for. See text for further detail of what is shown here. All these images are shown contrast-
stretched and shown on a square root look-up-table for ease of seeing the features.
OptArc AF51 Camera Page 91 of 99 User Guide v1.02
