Q S I 5 0 0 S E R I E S U S E R G U I D E
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Dark frame showing two cosmic ray hits in lower right hand quadrant
Inspect your dark frames for cosmic ray strikes or other anomalous pixel groupings. The
c ray hits in the lower right quadrant of the image.
icles originating from somewhere in space. They can come
set each have cosmic ray hits, doing a median combine of all
the images may yield a better combined image than averaging just the clean frames.
Experim
After y
each o
the Pro
dark frame above shows two cosmi
Cosmic rays are energetic part
from any direction and depending on the angle that they strike the CCD can be very long if
they are nearly parallel with the CCD or just a bright circle if they strike perpendicular to the
CCD.
If multiple dark frames in your
ent to get the best results.
ou’ve created your master dark frame for a given exposure length, subtract it from
f the light frames with that same exposure. Do this by selecting “Pixel Math…” from
cess menu.