JJC TCR Threaded Cable Release is applicable to all cameras with a threaded shutter release button JJC TCR can closely connect threaded shutter release button for a more reliable shutter release It can quick release the shutter to avoid the image shaking and can lock and unlock the bulb for long exposure shooting Product Highlights： - Closely connecting shutter thread hole for more reliable shooting - Quick release the shutter to avoid the image shaking - Bulb locking and unlocking design for long exposures shooting