M 57


M 57 - Ring Nebula


11.08.2010 01:45 to 11.08.2010 03:40
Az./Alt. positions: 268° / 55° to 285° / 34°
Ambient conditions: 20°C, humid partially cloudy sky, transparency 3/5, seeing 3/5

Location: Villa Tatti, Tuscany, Italy

Telescope: Deltagraph 300mm f/3.3
Mount: CGE
Camera: SXVF-M25C
Guiding scope: Orion short tube 80mm f/5
Guiding camera: ATIK 16IC
Filters: IDAS LPS

Software: Maxim DL 5
FOV, Image scale: 62.5 x 54.8 arcmin, 1.62 arcs/pixel
Sub-exposures: 18 min (9 x 2 min) light frames
No darks, 100 bias, 50x0.2s flats 

Images Plus 3.75: Calibration of light frames with bias and flats, DDP
Maxim DL: Stacking of calibrated frames with SDMask, color balance R85:G100:B120 
CS3: Levels, noise reduction with Carbonis Actions

Very bad weather. Only 9 frames were useable. Anyhow, M57 is too small for this image scale. 

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