The two large open star clusters straddling the Serpens-Ophiuchus border and thus called the S-O Double Cluster. They are IC 4756 at left, a very large and scattered group, and NGC 6633 at right, a more concentrated group. Both are best seen with binoculars, and the field of the 200mm telephoto lens used here simulates a binocular field of view. 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.
The pair of large and loose star clusters on the Serpens-Ophiuchus border known as the S-O Double Cluster. IC 4756 is at left; NGC 6633 is at right. Both are fine targets for binoculars. The 7.5 x 5° field is close to a binocular field of view. This is a stack of 10 x 6-minute exposures with the SharpStar 61mm apo refractor at f/4.5 and with the Canon R6 at ISO 800. Taken from home Oct 3, 2021. Diffraction spikes added with Astronomy Tools actions.
A portrait of a dim comet, PanSTARRS C/2017 K2, passing above the Serpens-Ophiuchus (S-O) Double Cluster at bottom, consisting of IC 4756 at lower left and NGC 6633 at lower right. This was the night of May 25-26, 2022. The comet is at top as a fuzzy green star, very small with a stubby tail. It was about 8th magnitude. This is a stack of ten 5-minute exposures with the William Optics RedCat 51 at f/4.9 and the Canon R5 at ISO 800.
