Catskills Fireflies 2012
Subject: Catskills Fireflies 2012
Location: Delaware County, NY (Catskills)
Twelve 5-minute exposures at ISO1600 with Canon T2i (550D) DSLR and Canon EF 24mm f/1.4 lens wide open at f/1.4. Focus was done on the background trees, and then moved inward to where most of the firefiles were expected. The camera was mounted on a fixed tripod, and was tethered to a laptop using a USB cable, and the 5-minute exposures were timed with EOS utility.
Processing: raw conversion to TIFF using Canon Digital Photo Professional. The twelve TIFF images were combined using Photoshop "apply image" processing with "lighten" mode, then downsizing and JPEG conversion with Photoshop (no levels, curves, sharpening, etc.). This is the full frame from the T2i. Image calibration (dark frames, flat frames, etc.) was not done.
It was clear and moonless -- SQM-L ranged from 21.3 to 21.5 during these exposures, depending (I guess) where the milky way was and how much it interfered with the readings.