Pixco Pro Focusing Infinity Focal Reducer Speed Booster With Optical Glass Lens Adapter for Pentax K PK to Sony E Mount NEX-7 NEX-C3 NEX-5 NEX-VG10 Normally ,the shipping time is about 6~15 working days to USA. 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. It must turn on 'shoot without lens' setting of your NEX camera in order to use the adapter