Pixco Pro Fousing Infinity Focal Reducer Speed Booster With Optical Glass Lens Adapter for Canon FD to Micro 4/3 M4/3 Camera Normally ,the shipping time is about 6~15 working days to USA. It converts fullframe lenses into APS-C lenses. The advantage is to get the fullfame field of view onto the APS-C sensor. Increase exposure to 1 stop, and you can use faster shutter speed to shoot an image. Works fine, closely combined with the bayonet smooth, like the original lens. Full manual operation, manual focus, manual iris adjustment can be achieved with body manual exposure, aperture priority exposure, combined infinite focus.