Astrophotography with the Nexstar SLT 102

Images processed with GIMP and/or Registax or DSS.

All taken with an 102mm F6.5 Celestron Nexstar refractor and Olympus 2020Z digital camera, using afocal projection.

By default, images are scaled by 75% and then cropped to 600x400. This gives scale of ~8''/pixel and roughly a 1.3o x 0.9o field for unzoomed images. Some larger objects are scaled by 50% (as noted), giving 12''/pixel and 2o x 1.3o. A few have not been treated this way yet, and are marked as 'old version's.

Click on any image icon to see the enlarged version ...


M13 - 4min, ISO400 (Derbyshire)- 9/9/08
M13 (1.5x zoom) - 3m 44s - 25/9/09
M27 - 11min, ISO200 - 30/11/08
M31 &M32 & NGC204 (50% scaling) - 34min, ISO200/400 Jan/Feb 2009

M33 - 29min, ISO200 - 27/10/08 + 2/12/08
M34 (1.5x zoom) - 8min IS200 - 20/11/09
M35 & NGC2158 (50% scaling) - 7min, ISO200 - 11/2/09
M38 & NGC1907 (50% scaling) - 8min, ISO200 - 2/12/08

M42 (50% scaling) - 47min, ISO200 - stack of 2007+2008
M44 (50% scaling) - 80sec, ISO400 - 9/3/08
M45 (50% scaling) - 13min - 30/11/08
M51 (+ NGC5198 top left) - 20.5min, ISO200 - 28+31/3/09

M57 - 3.5min, ISO200 - 17/10/07
M65+M66+NGC3628 - 4min, ISO400 (Northumbria) - 27/3/08
M65+M66+NGC3628 - 19min, ISO200 - 28+31/3/09
M81 + M82 - 9min, ISO200 - 11/2/09

M84 and others - 8.25min, ISO400 - 28/3/09
NGC457 - 3.5min, ISO200 - 16/10/07
NGC457 (1.5x zoom) - 4.2min, ISO200 - 17/10/09
NGC752 (50% scaling) - 11min, ISO200 - 30/11/08

NGC869+NGC884 - 1.5min, ISO200 - 17/10/07
NGC869+NGC884 (50% scaling, 1.5x zoom) - 9.7min, ISO200 - 16/10/09
NGC2024 (50% scaling) - 25min, ISO400/200 - 10+11/2/09
NGC2244 (50% scaling) - 8min, ISO200 - 4/3/08

NGC2264 (50% scaling) - 9.5min, ISO200 - 12/2/08
NGC2903 - 11min, ISO200 - 20/3/09 (bright sky)
Comet Loneos - 3min, ISO200 - 17/10/07
Comet Kushida - 7.5min, ISO200 - 13/1/09

Comet Holmes - 4min, ISO200 - 28/10/07
Comet Holmes - 2min, ISO200 - 2/11/07
Comet Holmes - 9min, ISO200 - 8/11/07
Comet Holmes (50% scaling) - 10min, ISO200 - 29/11/07

Come Lulin - 11min - 1/3/09 (50% scaling - faked to look stationary)
Come Lulin - 11min - 1/3/09 (50% scaling)

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