Stellarvue 78mm AT1010 Achromat f/6.15 test shot Mel111 Coma star cluster taken March 24, 2003 Fujichrome 400F slide film 28 minute exposure, STV guided used AP camera adapter Image is slightly soft and out of focus.
Stack of two 5-minute exposures with Canon 20Da at ISO400 and with 200mm lens at f/4. Taken April 20. Glow layer added to fuzz stars and spikes on stars are from lens diaphram and are not faked in points.
The large, naked-eye star cluster that makes up most of the constellation of Coma Berenices, aka Mel 111. This is a wide view to simulate the field of binoculars. The galaxies NGC 4565 (left) and NGC 4559 (top left) are visible, as is NGC 4494 between the sliver-like NGC 4565 and the main star cluster. I shot this in deep twilight and retained some of the natural deep blue of the twilight from the earlier shots. The differences in star colours show up. The diffraction spikes are from the lens iris blades from being stopped down to f/4 from the maximum aperture of f/2.8. This is a stack of 7 exposures, each 4 minutes at f/4 with the 200mm Canon lens and Canon 6D MkII at ISO 800, unguided on the AP Mach 1 mount.
