Nikon D3400 Reference Manual - English - Page 308
Built-in AF-assist illuminator, AF-assist illuminator does not light, Image size can not be changed
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AF-assist illuminator does not light: • AF-assist illuminator does not light if AF-C is selected for autofocus mode (0 69) or if continuous-servo autofocus is selected when the camera is in AF-A mode. Choose AF-S. If an option other than e (Auto-area AF) is selected for AF-area mode, select center focus point (0 74, 76). • The camera is currently in live view. • Off is selected for Built-in AF-assist illuminator (0 196). • Illuminator has turned off automatically. Illuminator may become hot with continued use; wait for it to cool down. Image size can not be changed: Image quality set to NEF (RAW) (0 85). Camera is slow to record photos: • Depending on shooting conditions and memory card performance, access lamp may light for up to about a minute after shooting ends in continuous release mode. • Turn noise reduction off (0 195). 284 Technical Notes