For shooting on film, this is the industry standard at the 450mm end of zoom range. Filters on the front of a long lens degrade its image, to compensate for this, the lens offers a filter slot near the back. The lens comes with two filter slots; each slot holds two 48mm filters.
At 26″ in length, the lens was designed with a rear section made of a thin stainless steel for optimal metal expansion and contraction in extreme weather. As a result, back focus shift is invisible.
This lens comes in the standard 150-450mm or as an anamorphic lens in the 300-900mm range.
