Canon 80D Flash

Coverage and Range
Good flash range, though with very narrow coverage. Average positive exposure compensation required.

Coverage. Canon rates the EOS 80D's internal flash coverage at approximately 17mm, though as you can see in the above shot taken at 18mm, we've found manufacturers' coverage ratings are usually quite optimistic. Peripheral Illumination Correction was on (by default) for this shot, so the fall-off seen here in the corners and vertical edges is mostly from the flash itself.

Exposure. Indoors, under incandescent background lighting, the Canon 80D's flash performed well, requiring the typical +0.7 EV positive exposure compensation needed for this test scene with Auto ISO selecting ISO 400 and a shutter speed of 1/250s. The camera's slow-sync flash mode didn't require exposure compensation for a good exposure, though the longer exposure (1/30s) resulted in a warmer orange/yellow cast from the ambient background lighting.

Manufacturer Specified Flash Test. The Canon 80D's built-in flash has a rated Guide Number of 12 meters or 39.4 feet at ISO 100. That works out to about 7.0 feet at f/5.6. In the shot above at those settings, we can see that the Canon 80D's built-in flash performed to specification, producing a well-exposed flash target at the rated distance.