Bower SFD728N Automatic TTL Flash for Nikon i-TTL The Bower SFD728N Nikon i-TTL Zoom Shoe Mount Flash is fully automatic, with full TTL operation. Compact and lightweight at less than 8 oz (without batteries). Bounce & Swivel Head: Flash has vertical bounce of 90 and horizontal swivel of 330 Guide No. 92' (28 m) at 50mm