The model HD-7000PRO high definition Wideangle conversion lens is made of the high index optical glass elements with new concept of lens designing using three-group/three-element lens formula. This new concept in designing the lens made it possible to achieve an amazing high definition wide-angle lens of 540 lines/mm resolution power at center (MTF30%).
It's compatible with whole zoom area and stays in focus.
There will be no reduction of light value when this conversion lens is attached on the camera's lens.