[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
- To: email@example.com
- Subject: Re: experiments
- From: Michael Gutzwiller <firstname.lastname@example.org>
- Date: Fri, 22 Aug 1997 22:59:59 -0400
- Old-Return-Path: <email@example.com>
- References: <9708222158.AA18247@runner.nofs.navy.mil>
- Resent-Date: Fri, 22 Aug 1997 23:00:33 -0400 (EDT)
- Resent-From: firstname.lastname@example.org
- Resent-Message-ID: <"5Qw8qD.A.Ri.yIl_z"@kani.wwa.com>
- Resent-Sender: email@example.com
Even as I write this I am experimenting with making an independent flat
What I did was drape a thin tablecloth in front of the triplet earlier
tonight. It was illuminated only by the ambient light of late
twilight. I ran the triplet as normally for the full exposure time.
This was adequate for the purpose it seems. The tablecloth seemed to
transmit much better through the I filters than the V filter though.
The V values were only 1000 ADUs above the dark field but that's
probably enough. As with the sky flats I have been using the peak to
trough range was of the order 5 to 8 percent.
I am now taking normal data and will compare the sky flats to the
tablecloth flats. I will compare them directly by dividing one by the
other and I will also compare the magnitudes computed with each in the