The Ring Nebula and IC 1296
Optics/Mount: CPC1100 with f6.3 Celestron reducer on a Milburn Wedge. Dec antibacklash set to 27/27. PEC on.
Camera: DSI II Pro
Exposure: 60 x 1 minute
Date: June 6-7, 2011
Conditions: Seeing 3-4/5, Transparency 3/5. No wind.
Image scale at capture: 1.22 arcsecs/pixel = f/5.7
Guiding Hardware: DMK21AU04.AS, Taurus Tracker III off axis guider. Guiding scale 0.81 arcsec/pixel. 1 second guide exposures.
Guiding Software: PHD. Aggressiveness 100, Hysteresis 0, Minimum Move 1, Max RA 1000, Max Dec 600. Dec set to auto/resist switching. Dithering set to Extreme with Settle < 0.5. Calibration steps 11 x 12.
Guiding performance: FWHM of subs = 3.7 arc seconds. RMS 0.55 arc seconds, OSC 0.31.
Exposure: 21 x 10 minutes
Date: June 3-4, 2011
Conditions: Seeing 2/5, Transparency 3/5. No wind.
Image scale at capture: 0.95 arcsec/pixel = f/6.05
Guiding Hardware: DMK21AU04.AS, Taurus Tracker III off axis guider. Guiding scale 0.73 arcsec/pixel.
Guiding Software: Metaguide. Guide star mag 8.44, 7.5fps, Nframes 7, AccepFrac 0.5. Aggressiveness 0.5 RA, 0.5 Dec. Dec reverse set to 0.9.
Guiding performance: FWHM of subs = 4.4 arc seconds. FWHM of guiding 2.84 arcsecs.
Light pollution: Bortle 8 (white zone)
Filters: Astronomik 2c L for luminance frames only.
Scale of presentation: 0.61 arcsecs/pixel (2x enlargement of luminance data); frame cropped
Capture software: Sequence Generator and Nebulosity 2.
Processing: Stacked with Deep Sky Stacker, post-processed with Photoshop CS2, deconvolution and wavelets in AstraImage PS plugin.