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pre-flash
pre-flash n.
Brit. 
/ˈpriːflaʃ/
, /ˈpriːflaʃ/U.S. /ˈpriˌflæʃ/
(in flash photography) an initial flash emitted by a camera which causes the subject's pupils to contract, and thereby reduces the possibility of the main flash causing red-eye./ˈpriˌflæʃ/ΚΠ
1985 Petersen's Photographic (Nexis) Nov. 77 P11 8-1/2 would indicate a preflash at 11 inches and a normal exposure at 8-1/2 inches.
1991 Pract. Photogr. Jan. 9/2 (advt.) The flash emits a series of soft, pulsing pre-flashes causing the pupils of your subjects' eyes to contract. So when the flash fires, red-eye virtually disappears.
2001 Daily Tel. 20 Nov. 30/4 A lot of models nowadays have a red eye reduction mode. This is usually a bright light or weak ‘pre-flash’ before the main flash that reduces the size of the subject's pupils.
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