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.
