The Olympus STF-8 Macro Flash is ideal for outdoor photography. Compatible with TTL Olympus cameras, the twin flash design offers a maximum guide number of 27.9 feet at ISO 100. The flash covers a focal range of a 12mm lens. You can set the Olympus STF-8 to fire one or both flash heads. The tilting design of the flash head allows adjustment from 0 to 60° and 0 to 40° in the upward and downward direction respectively. You may set the flash power from 1/1 to 1/128. The flash head synchronizes with the OM-D camera to use its Focus Stacking and Focus Bracketing modes. The dustproof and splashproof construction ensures durability. This Olympus flash also resists extremely cold temperatures down to 14°F.