Carl Zeiss Jens MC Flektogon 20mm f/2.8
Carl Zeiss Jens MC Flektogon 20mm f/2.8 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.
54 mm long, requires consideration if you want to carry in the camera bag. 67 mm lens filter diameter, you are one step from the next standard filter size, buy step-up ring and bigger filter. Weights 350 grams so plan ahead, carry only if really necessary.