The Sony HVL-MT24AM Macro Twin Flash Kit provides TTL metering for close-up flash photography. When working with a macro lens, the effective aperture varies greatly due to the extreme focusing range. The actual aperture of the lens may be several stops smaller than the indicated value, and TTL metering accommodates for this effect without the need for time consuming calculations. This is the ideal system for a macro shooter of moving subjects. Ratio-variable lighting Compacts neatly when not in use Flash heads can be attached at various angles to each other Seven manual power settings & 3 custom functions: -Vary time until power-off, or disable entirely -Use exposure modes other than metered manual for TTL operation -Change manual power level increments to 0.5 EV Angle of coverage (twin flashes): 45