Case, Petal-type hood with lock(LH878-04) and Guide Plate(GP-21) supplied Offering overwhelming optical performance and unlimited potential for ultra wide-angle creativity at a compact physical size. State-of-the-art optical design and the large, high-precision double-sided aspheric glass front element made it possible to add a front filter thread and also features rear filter holder make this lens the ultimate choice for astrophotography. https://www.sigma-global.com/en/lenses/a022_20_14/
