Nauticam TN1017-Z+1 1.4 For TOKINAZoom 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 the Tokina 10 17mm lens with Kenko 1. 4x Teleplus Pro 300 teleconverter. 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 best to