Landolt Standard PG1323 on the 1.3m Telescope
We have spotted a peculiarity in observing the Landolt standard PG1323.
It appears as though the light of a bright star (most likely Spica) outside the field of view
is not properly baffled, causing the raised level of the background, as
shown here:
In principle, this should not affect the count rate in the standard
stars themselves, but, we do not recommend using this particular
standard for your observations.