Flash as main light was used to create the image below of a Great Blue Heron just after sunset at Gatorland. The flash creates a sharp image and illuminates the bird. The shutter speed used created a dark background as it was higher then the amibient light exposure called for. When using flash, aperture and ISO influence the flash exposure – in addition to flash output and flash exposure compensation. Shutter speed affects ambient light exposure but not flash exposure. By using a higher shutter speed, you can create a darker, more subdued background like this.
I cropped this a few different ways but came back to this as my favorite.
Canon 1D Mark IIn, Canon 600mm
1/640 sec, f/4, Manual, Evaluative, ISO: 400, Flash exp comp: -1 2/3






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