Large and loose open cluster in Ophiuchus, IC 4665, in a wide-field image simulating the field of binoculars. Taken July 24, 2012, from home with the Canon 5D MkII at ISO 800 and Canon L-series 200mm lens at f/3.5 for a stack of 5 x 3 minute exposures.
IC 4665, the large and sparse open star cluster in Ophiuchus above the star Beta Ophuichi, aka Cebalrai. This cluster stands out well when scanning with binoculars, but is too large and sparse to be a good target for most telescopes. The telesphoto lens used here provides a field of view similar to binoculars. This is a stack of 6 x 2-minute exposures with the 200mm lens at f/2.8 and Canon 6D MkII at ISO 800.
IC 4756 and NGC 6633 S-O Double Cluster, taken Aug 15, 2007 from home. Stack of 3 x 4 minute exposures at ISO800 with Canon 20Da and 135mm L-lens at f/2.8. Field equals 7° bino field. Slight trailing (not guided).
