[Aavso-photometry] sky flats

[Tim Crawford]

Papini,

Sounds like you have a nice setup.

Only comment I can make is that we usually take flats = 40% - 50% of the max ADU.... as an example,
if the maximum ADU accumulation of your chip = 60,000 ADU then your flats should typically fall between
24,000 - 30,000 ADU.... myself, I usually favor closer to 50% of the maximum ADU.... others may have differing opinions.... take them all in and make your own decision... OH, by the way, this is a good topic for a AAVSO topic search from the main page (see search box at top).

Check the topic on flats contained within the AAVSO CCD Manual:

www.aavso.org/observing/programs/ccd/manual/3.shtml#4

Papini,

Also, remember that there is no such thing as a dumb question...

Good luck and keep asking questions as you need too.

Ad Astra

Tim Crawford CTX
Arch Cape Observatory


----- Original Message ----                               abreviated
From: Papini Riccardo <paprika at inwind.it>

Hi all,

Later (may be in the afternoon or the day after) I choose the flats with the
maximum signal in the pixels greater than 10.000 ADU and less than 60.000
ADU and average them creating a master flat.

Riccardo Papini