Sigma SIGMA cable release CR-21

Compatible models: SD1/SD1 Merrill, SD14, SD15 The release button can be locked, making it suitable for long exposure shadows and bulb photography. Product size: ‎1 x 3 x 21 cm Product model number:‎AR5000 Brand: Sigma ●SD1/SD1 Cable release for Merrill, SD14, and SD15. ●The release button can be locked, making it ideal for long exposure shadows and bulb photography.