"Auto flash" refers to a feature in cameras that automatically emits a burst of bright light to improve the lighting conditions for taking pictures. Full definition
And this was to be my perfect indoor location, but my temperamental auto flash wouldn't co-operate, aaarrrrhhh! (annasislandstyle.com)
An exposure adjuster lets you dial up or down the brightness level before you even press the shutter, while a «smart flash» merges two photos (one without flash and one with auto flash) to make for a better picture. (thenextweb.com)
Low light shots can be blurry and washed out as HDR and auto flash kicks in. (itwire.com)