Nikon D810 Product Manual - Page 354
Auto FP High-Speed Sync, Flash sync speed, 320 s Auto FP, 250 s, Shutter speed, Built-in, flash
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❚❚ Auto FP High-Speed Sync When 1/320 s (Auto FP) or 1/250 s (Auto FP) is selected for Custom Setting e1 (Flash sync speed, 0 329), the built-in flash can be used at shutter speeds as fast as 1/320 s or 1/250 s, while compatible optional flash units (0 430) can be used at any shutter speed (Auto FP High-Speed Sync). Flash sync speed 1/320 s (Auto FP) 1/250 s (Auto FP) 1/250 s Shutter speed Built-in Optional Built-in Optional Built-in Optional flash flash unit flash flash unit flash flash unit From 1/8000 to but not including 1/320 s - Auto FP - Auto FP - - From 1/320 to but not including 1/250 s Flash sync * - Auto FP - - 1/250-30 s Flash sync * Flash range drops as shutter speed increases. Flash range will nevertheless be greater than that obtained at the same speeds with Auto FP. D The Flash-Ready Indicator When the flash fires at full power, the flash-indicator in the camera viewfinder will flash to warn that the resulting photograph may be underexposed. Note that the flash-ready indicators on optional flash units will not display this warning when 1/320 s (Auto FP) is selected. 330