David's Astronomy Pages
Notes - Session 355 (2009-03-05)

Previous Notes
Notes
(S351)
  Notes (main listing)
Notes
(Main)
 
Home
Page
  Next Notes
Notes
(S356)
 
Flat History (8" LX200 + ST-7E)
 
>

Goto Images from 2009-03-05


Flats History (8" LX200 + ST-7E)

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) 
 
 

Back to Top


This Web Page: Notes - Session 355 (2009-03-05)
Last Updated : 2010-01-23
Site Owner : David Richards
Home Page : David's Astronomy Web Site