Overview Specs In the Box Reviews 0 Accessories Q&A 5 Learn more on Explora Punch up your scene with some additional light from the SF 40 Flash from Leica. Optimized for use with Leica's latest cameras, the SF 40 has TTL support for automatic exposure and metering and it features a compact design with a useful output. Rated with a guide number of 131' at ISO 100 and 105mm, this unit can easily illuminate a room or subject. Also, it has a zoom range of 24-105mm, which can be expanded to 16mm with the use of the pull-out diffusion panel, for excellent coverage with your lenses. On top of this, an LED video light with 9 output levels is available for lighting a scene for high resolution video capture.