This is an Electronics video tutorial where you will learn how to use the RPT mode on a Nikon SB-800 and SB-900. Repeat mode gives a flashing strobe effect with which you can take multiple shots in one single long exposure. In Nikon SB-800, switch on the flash and select the RPT mode. The video then demonstrates the various selections available in the RPT mode. In Nikon SB-900, again switch on the flash and select the RPT mode by pressing on 'mode' button. The video then goes on to demonstrate the various selections under the RPT mode. After firing, leave the speed light alone for cooling for a few seconds.