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Widefield camera flatfield from 2020 July 16

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About this observation
Observer
Richard Miles
Time of observation
16/07/2020 - 21:00
Object
Dusk sky
Observing location
Golden Hill Observatory (J77)
Equipment
Canon 300mm f/2.8 lens
Starlight Xpress H18 (KAF8300) CCD
V filter
Exposure
4 sec
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The camera has a mechanical shutter that takes about 1/40 sec to open fully so to avoid a gradient in the response I had to use a relatively long (4 sec) exposure and stacked 42 such frames dark-subtracted using 20 dark frames. Stars are registered and these are edited out by cut and pasting small sections using Salsa J software.

Comments

nickjames's picture

I've seen worse...

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