Two ELD glass elements in the front lens elements reduce chromatic aberration to a minimum and also ensure sharp, quality images of high contrast.
The Internal Focus system ensures the overall length of the lens does not change during focusing, ensuring convenient handling and ease of use.
A drop-in 46mm filter holder in the rear part of the lens barrel, which can be rotated to facilitate the use of filters, including a polarising filter which comes included with the lens.
By adding an APO teleconverter (optional extra), you can use this lens as a 700mm F6.3 MF ultra-telephoto lens with a 1.4X EX teleconverter, or as a 1000mm F9 MF ult ra-telephoto lens with a 2X teleconverter.