Old 24-10-2015, 05:46 PM
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Somnium (Aidan)

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Join Date: Oct 2014
Location: Sydney
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Taking flats remotely

in the past i have taken flats with my light box which gave me great, evenly illuminated flat images. since setting up the observatory i thought i would take flats before an imaging session during dusk but i have found there is about a 15 min window where i am not shooting many stars and my sensor is not being saturated which makes it difficult to get the flats i need. granted i am shooting at f4 (10") with a 8300 sensor so i might get a bit more range when i am shooting at higher f and a different sensor. regardless, i am thinking that it would be better to get flats that are taken off a consistent and even field.

i just wanted to get a feel for what others use ...

there is this option http://www.optecinc.com/astronomy/ca.../flatmanxl.htm

a little expensive so i was thinking of making one.

maybe converting one of these

Last edited by Somnium; 24-10-2015 at 05:56 PM.
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Old 25-10-2015, 02:29 PM
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RickS (Rick)
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Join Date: Apr 2010
Location: Brisbane
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I capture dawn and dusk sky flats using ACP and two sessions are adequate to capture a dozen flats for each filter (full set of LRGB and Ha/Oiii/Sii). That gets me to my target of 500Ke- per flat master. Fortunately, my camera has deep wells so 12 flats is plenty, but it also has slow downloads and a smaller sensor would probably be able to capture more flats in the available time.

ACP automates the process nicely, tracking the anti-solar point and taking test exposures to judge the right time to start flats for each filter. It would be difficult to do effectively as a manual process.

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