Manfrotto Magnesium Photo Movie Head w 501PL Plate Sigma SA Mount The SIGMA MOUNT CONVERTER MC 21 The SIGMA MOUNT CONVERTER MC 21 allows SIGMA SA mount and SIGMA’s CANON EF mount interchangeable lenses to be mounted on L mount cameras Levelling spirit bubble attaches to the base of the centre column and helps achieve a finer degree of accuracy when capturing image content With a single product it is possible to take advantage of an extraordinary Photo Head and a Fully Featured video head In Photo mode the head provides the speed and maximum freedom in all directions like a ball head combined with an incredibly precise smooth and controlled movement never experienced before thanks to the fluid cartridges and an adjustable counter balance control