500mm F8 Mirror Lens For Canon 6D2/90D/60D/50D/Rebel T5/T4i/T3i/T3/SL3/SL2/SL1
Align the identification point of the lens mount with the identification point of the adapter ring, and rotate it clockwise. The foldback design greatly reduces the size and weight of the lens, making it more convenient to use and carry.