"flash photograph" is correct and usable in written English.
You can use it when referring to a photograph taken using a flash. For example: "The wedding photographer took a few flash photographs of the bride and groom."
During night matches, they took flash photographs.
Others seemed more concerned with taking flash photographs or chatting.
The audience was asked not to take any flash photographs and to maintain total silence.
The crowd, many dressed to the nines, took flash photographs of the screen during iconic moments.
Directly below Fanny and Constance lived somebody who took flash photographs from his or her balcony, the bright quiet blast of light below them every now and then like a spill of phosphorescence, fairy dust, at their feet.
Jacob Riis, a Danish immigrant, read Dickens, and later filled his own exposé, "How the Other Half Lives," with heart-wrenching, Dickensian details, backed up by documentary flash photographs, among the first in history.
In addition to staying awake, Mr. Beckwith's duties included enforcing the gallery's rules against touching the art, taking flash photographs and using pens -- as well as giving directions.
It timidly allows the crassest values to prevail in front of this wondrous work of art, even letting people take flash photographs that blind the onlooker to its merits, catering to people who just come to say they were there.
It's quite a bit to take in all at once, which may be why a guy in front of me pulled out his iPhone and repeatedly took flash photographs during one of the Day-Glo genre excursions sprinkled throughout "Broke House".
