The large and sparse open cluster in Ophiuchus called IC 4665, an object easy in binoculars. The star at centre is Celbalrai or Beta Ophiuchi. The 7.5 x 5° field is close to a binocular field of view. This is a stack of 9 x 4-minute exposures with the SharpStar 61mm apo refractor at f/4.5 and with the Canon R6 at ISO 800. Taken from home October 1, 2021 on a slightly hazy night with the field into the southwest.
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 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).
