Crescent Moon and the Soap Bubble Nebula at Dusk

Captured over 13 nights from June 27 to July 14, 2021, during nautical twilight. The Sun's altitude never dropped below 12 degrees below the horizon during this period. I started and ended the hydrogen-alpha exposures at an altitude of about -8.5 degrees, and the oxygen-III exposures at -10.5 degrees (roughly the moments when the crescent outline began to appear in the evening and fade in the morning on stretched single frames). Each night, I managed to capture only 2-3 hours of useful data, but thanks to a long stretch of clear, cloudless weather, enough signal was accumulated to reveal faint details. The semi-permanent setup in my backyard allowed me to avoid going crazy from constantly assembling and disassembling the equipment.

The small bluish circle in the lower left corner is the faint Soap Bubble Nebula. This planetary nebula was discovered relatively recently by an amateur astronomer (Dave Jurasevich) in his images from 2007 and 2008.