The second 'designed for the D40' accessory today is the SB-400 Speedlight, a compact yet powerful external flash with a tilting front (horizontal, 60, 75 and 90 degrees). This unit has a guide number of 21 (m at ISO 100 at 18mm) and has a shooting distance of 60 cm to 20 m (2 to 66 ft).
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The second 'designed for the D40' accessory today is the SB-400 Speedlight, a compact yet powerful external flash with a tilting front (horizontal, 60, 75 and 90 degrees). This unit has a guide number of 21 (m at ISO 100 at 18mm) and has a shooting distance of 60 cm to 20 m (2 to 66 ft). 