Combination of 20, 0.02 second exposures.
SBIG ST8XE CCD. 20" f/6.8 Dall-Kirkham cassegrain telescope at prime focus.
Situated a little to the east of Copernicus on the Carpathian mountain range, Erathostenes is a 60km diameter crater with interesting terraced walls and a multiple central peak. It is one of my favourite craters, however for most observers, it tends to get overlooked in favour of its larger companion to the west. It usually becomes visible the day before Copernicus. When the sun first rises over it, the crater and the surrounding steep mountains make for a spectacular sight.
0.002 seconds exposure, SBIG ST-8E CCD.
18" f/10.5 Ritchey-Chrétien telescope at prime focus.
0.005 seconds exposure, Meade 416XTE CCD.
16" f/20 refractor at prime focus.
Combination of 10, 0.02 second images using an H-alpha filter.
SBIG ST-8XE CCD. 16" f/10 schmidt-cassegrain telescope plus a 2x barlow lens.
Combination of 20, 0.02 second exposures with an H-alpha filter. SBIG ST-8XE CCD.
20" f/6.8 cassegrain with a 2x barlow lens.