David's Astronomy - Notes 2009-03-05 (S00355)

Selection of Master Flats (2x2) from 2003-2009 with Flat Field/Vignetting Analysis made using CCD Inspector in 2009

Master Flat Frames taken through 8" LX200 Classic with ST-7E average or average median combine, 2x2 binning, C Filter

2002-10-03 (S029)		2002-12-09 (S035)

Top left dust particle removed

2003-08-03 (S048)		2003-08-12 (S050)

Filter Wheel Added 2004-02-05 (S056) Rather poor flats ?

2004-09-02 (S070)		2004-12-11 (S079)



2005-05-14 (S086)

6.3 Focal Reducer added to imaging train (2005--08-06, S090) Increased vignetting at f/6.3 compared to f/10

2005-08-06 (S090)		2005-08-14 (S092)

Sag developing (weak bearings on JMI NGF-S focuser)

2005-12-22 (S107)		2005-05-09 (S123)



2007-03-02 (S179)

Sag getting very bad 'flats' varying between different sky positions

2007-05-06 (S195)		2007-05-25 (S200)

Bearings on JMI NGF-S tightening Optical /Illumination centre lying close to Image Centre

2008-01-06 (S250)

JMI NGF-S focuser replaced by Optec TCF-S focuser - 2008-02-16 (S265) 8" LX200 Classic / Optec TCF-S / f6.3 reducer / ST-7E More robust focuser ---> removes sag in imaging train

2008-02-16 (S265)		2009-03-06 (S355)


New Equipment Master Flat Frames taken through 12" LX200 R with ST-10XME average or average median combine, 3x3 binning, C Filter Larger CCD chip --> Increased vignetting

2009-03-26 (S238)		2009-04-05 (S361)


Temporary Setup (Jan 2010) Master Flat Frames taken through 8" LX200 Classic (at f/10.1) with ST-10XME Average median combine, 3x3 binning, C Filter Larger CCD chip in 8" scope --> Increased vignetting

2010-01-17 (S411)

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Notes - Session 355 (2009-03-05)