Nikon SB 20 User Manual
Page 24
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^ Confirm whether the green in-focus
' indicator LED iights up, then fuliy depress
the shutter reiease button.
If focus-not-possible indicator LED (x) remains lit
when using the Nikon F-501/N2020, or if focus indi
cator LED (•) blinks with Nikon F-401/N4004, auto
focus fiash photography is impossibie. Focus manuaiiy
on the ciear matte fieid.