Kaavie - Travor SL-585C TTL High-Speed Sync Flash Speedlite for CANON Camera Fit Devices: Canon. Built with self-designed chip to succeed super speed of charging recycle,approx 1s. With high Guide No.: 58(ISO100,105mm), support M and Multi Mode. The Master mode is provided High-Speed Sync ETTL for SL-585C speedlite to control Canon Speedlite, SL-582C 578C 568 and SL-566 Speedlite, in 4 channels, 3 groups/Ratios (A, B and C) SL-578C/568/SL-566 speedlite under the Slave mode, flash signal can be received from Canon Speedlite and SL-585C/582c(TTL & Wireless), SL-568 Speedlite. Flash signal from all brand of speedlites can be received by SL-578c/568/566 speedlite under S1 Mode. SL-568/566 speedlite under the S2 mode , Flash signal can be received from Canon Speedlite working at TTL mode. high quality high-speed sync flash sppedlite. Support Auto/Manual Zooming: The covered focal length will vary among auto, 24105mm on the lamp adapter by operating the zoom button on the flash light, supports full-frame/half-frame camera Comprehensively Support TTL Functions: The 585c supports HSS, FEC, FEB, Rear-curtain sync, FE lock, Modeling Light, Canon camera menu accessible.