CMEF815-Z Zoom Gear ~for Canon EF-EOS M Adapter and EF 8-15mm f/4L Fisheye USMZoom gears allow access to the mechanical zoom function of supported lenses. Use of this gear may require the use of additional port extensions or adapters. Check the Port Chart for more details. This zoom gear is for systems using the Canon EF EOS M Adapter and Canon EF 8 15mm f 4L Fisheye USM lens. This item is non returnable, non refundable, non cancellable, and may be subject to extended lead times as it is manufactured on demand. We always do our