Sigma MF 400mm f/5.6 Telephoto

Sigma MF 400mm f/5.6 Telephoto is a manual focus ultra telephoto lens for full frame cameras.

Optical design

Has 6 aperture blades, this number of blades are commonly used. Having rounded blades provides out of focus circle shape closer to a circle. Not the best in low light conditions but the lack of high aperture can be compensated with higher iso

Physical characteristics

Weights 830 grams so it is a heavy lens, consider using its own lens bag. 204 mm long, with this size carry only if you use it. With a lens filter diameter of 72 mm you are one step from the next standard filter size, buy step-up ring and bigger filter but you can chose from plenty options.