Usable Optional Speedlights-continued

5 Confirm ~ appears in the viewfinder, focus and fully depress the shutter release button to shoot.

~ in the viewfinder blinks approx. 3 sec. after fu ll flash output. This may indicate underexposure has occurred. Check the focus distance, aperture or flash shooting distance range and shoot again.

When the subject is dark, the camera's AF-Assist Illuminator automatically turns on to guide autofocus (the Speedlight's AF-Assist Illuminator does not turn on). See page 50 for details.

Non-TTL Auto Flash

In Non-TTL Auto Flash shooting, light output automatically changes to match the flash-to-subject distance, but the light is measured by the light sensor on the optional Speedlight instead of being measured through the lens. Compared to TTL Auto Flash of the built-in Speedlight, where the light is measured through the lens, the control of the flash output level is somewhat less accurate.

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Image 94
Nikon 3700, 3699, 55 instruction manual Non-TTL Auto Flash