SN910EX-RF is the First Wireless Radio Transmission RT System Speedlight for Nikon cameras in the world.<br> <br> Features:<br> The First Wireless Radio Transmission RT System speedlight for Nikon cameras in the world.<br> Wireless radio master function and slave function｣ｬ can be used as on-camera master unit and remote slave unit of RT system.<br> Supports high-speed sync｣ｬ the maximum shutter sync is up to 1/8000s.<br> Supports multiple trigger modes｣ｬ and it can be triggered through the set-top of camera｣ｬ 2.4G wireless triggering｣ｬ S1 and S2 basic optic slave modes.<br> The wireless triggering distance can reach up to 100m｣ｬ better to meet your needs.<br> The speedlite with high index supports TTL/ M/ Multi flashing modes.<br> Multiple flash groups｣ｬ it supports A/B/C groups.<br> Add standard PC port｣ｬ you can make the flash synchronously by connecting to the PC port.<br> Auto and manual zoom｣ｬ the flash coverage can be changed between 20-200mm.<br> <br> Specifications:          Guide Number        GN 60m(ISO 100/200mm)       <br>       HSS        to 1/8000s       <br>       Flash Mode        i-TTL /M /Multi       <br>       Trigger Mode        On-camera flash/ 2.4G Shanny RF wireless system/ S1&amp;S2 basic optic slave modes       <br>       Zoom Range        20-200mm auto and manual zoom(14mm with wide-angle diffuser)       <br>       Master Flash        Master wireless radio signal transmission       <br>       Slave Flash        Wireless slave 2.4G RF for Nikon/ S1 &amp; S2 basic optic slave modes       <br>       Sync Mode        HSS / 1st curtain sync / 2nd curtain sync       <br>       FEC(Flash Exposure Compensation)        Support(1/3rd increments｡ﾀ3 stops)       <br>       FEB/FEL        Support       <br>       AF Assist Light        Support(LED AF Lamp)       <br>       Modeling Flash        Support       <br>       Manual Flash        1/128-1/1 output control(1/3rd increments)       <br>       Stroboscopic Flash        1-100Hz       <br>       Full Power Recycle        ｡ﾜ3s       <br>       Wireless Radio Transmission Distance        ｡ﾜ100m       <br>       Multiple Flash Groups        Support A/B/C Flash Groups       <br>       GLS Mode        Support to set the independence group mode       <br>       Wireless Radio Transmission Optical Channels        CH1-CH15       <br>       Sync Port        External battery port / PC sync port/ Standard hot shoe       <br>       Battery        4 * AA Alkaline or NIMH battery(Not included)       <br>       Other Features        Sound prompt/ heat protection/ custom function/ large clear LCD screen ect.       <br>       Item Weight        420g / 14.8oz       <br>       Item Size        20.5 * 7.8 * 4.9cm / 8.1 * 3.1 * 1.9in       <br>       Package Weight        699g / 24.7oz       <br>       Package Size        21 * 11 * 9cm / 8.3 * 4.3 * 3.5in       <br>    <br> Package List:<br> 1 * Speedlight<br> 1 * Bag<br> 1 * Micro Plate<br> 1 * User Manual(English / Chinese)<br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>