Transit of Mercury

In Tucson seeing was mostly fair to poor. At sunrise there were thick clouds that disappeared for a nice window after mid-transit when this photo was captured and then more haze and light clouds for toward the end of the transit. This photo was at about best seeing conditions.

Questar telescope with a full aperture glass filter and a Nikon D850 camera at iso 640.

This is a single image processed with Photoshop.