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Strange Bias on Atik460EX - by: cherno

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Hi,
I am testing my ccd with indi and took 50 bias frams at -10°C at 0.01sec exposure time. The mean and the median of these biases show a stable cross of about 10 counts over the rest of the image plane. Doing the exposures with artemis.exe there is no cross but other features in the mean bias of my Atik 460EX. The different frame sets are equally processed with eso-midas.

Tests with an Atik 420 from a friend produce equal biases form indi and artemis.

Whom should I trust? I did two series with indi at different days. the meanbias always show the cross feature.
Strange.

cherno

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