Robert Harding

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832-393602 - Various colourful flowers of meadow flowers lie on top of each other, Cornflower (Cyanus segetum), maiden in the green (Nigelaa amascena cv.), Petunia x atkinsiana (Petunia x Hybrida) (snapdragon (Antirrhinum), studio shot against a black background
1350-91 - A telescopic closeup of Comet Lovejoy (C/2014 Q2) on January 19, 2015. I shot this from near Silver City, New Mexico, using a TMB 92mm apo refractor at f/4.4 and using a Canon 6D at ISO 1600 for a stack of 4 x 5 minute exposures. The ion tail is primarily from a single exposure to minimize blurring from the comet's motion relative to the stars. The rest of the image is from the stacked combination to minimize noise.
1350-29 - Omega Centauri globular cluster, with Canon 20Da camera with 4-inch Astro-Physics Traveler apo refractor at f/6 for 4 minutes each at ISO800. Stack of 4 exposures, averaged stacked. Plus short 2-minute exposure for core area. Taken from Queensland, Australia, July 2006.
1350-88 - An aurora display on the night of June 7/8, 2015 from southern Alberta, with an old rustic farm truck as the foreground. This is a frame from a 450-frame time-lapse with the Nikon D750 at ISO 1600 and the Sigma 24mm lens at f/2.8, for 8 seconds each. The foreground is from a stack of 8 images adjacent in time to the sky image stacked in Mean mode for smoothing of noise.
1350-16 - Comet Holmes, 17P, taken Nov 1, 2007 on excellent night. Taken with A&M 105mm apo refractor at f/5 with Borg 0.85x compressor/field flattener on SkyWatcher HEQ5 mount. Canon 20Da camera at ISO400. Composite of 4 min, 2min, 1min, 30sec, 15sec, and 7 sec exposures, each exposure being a stack of 3 to 4 identical exposures. Registered and stacked in Photoshop (HDR mode did not produce usable result, so manually composited with sucessively smaller masks to reveal short exposure content around nucleus. Contrast exaggerated with Curves to bring out very faint tail structure. North up, so tail to the S and SW.Nucleus is dot at upper left of inner coma, other star in inner coma at right is a field star