The Canon Control Ring Mount Adapter EF-EOS R lets you use Canon EF and EF-S lenses on EOS R series mirrorless cameras. It adds a programmable control ring, set from the camera menu, to adjust aperture, shutter speed, ISO or exposure compensation without taking your eye off the viewfinder, giving older EF lenses the same extra control as native RF lenses. The adapter is sealed against dust and moisture like Canon's weather-resistant bodies, so it can be used on location. It is the ideal way to keep an existing lens collection when moving to an EOS R camera. Weighing about 130 g, it adds only 24 mm of length. After comparing online prices, www.marvel.co.za should be the cheapest on this product.