The Studio Baseplate with 12" (30.48 cm) Rods for C100/C300/C500 from Zacuto is designed specifically for the Canon EOS C100, C300, and C500 cameras. It is exceptionally flat which helps to keep the center of gravity quite low. This baseplate features a pair of 15 mm rods that are 12" (304.8 mm) long running through the length of the baseplate. You can quickly reposition the rods for various lens lengths by loosening the 2 levers, one on each side of the baseplate.