Avanar 28mm f/2.8 Dyna Coated
Avanar 28mm f/2.8 Dyna Coated is a manual focus wide angle lens for full frame cameras.
Bright lens thanks to the high aperture value Has 6 aperture blades, this number of blades are commonly used. Having rounded blades provides out of focus circle shape closer to a circle.
62 mm lens filter diameter, rarely used filter size, make a try with step-up rings.