Sigma AF 21-35mm f/3.5-4.2

The Sigma AF 21-35mm f/3.5-4.2 is a camera glass that offers a wide angle view for full frame cameras. It has both autofocus and manual focus options. The lens is made up of multiple glass elements and has a lens coating to reduce unwanted reflections. The aperture range is from f/3.5 to f/4.2, which allows for good depth of field control. The build quality of the lens is good and it has a resolution that is suitable for most photography needs. There are alternative options available for this type of photographic lens, but the Sigma AF 21-35mm f/3.5-4.2 is a solid choice.

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.

Physical characteristics

Weights 480 grams so plan ahead, carry only if really necessary. With a lens filter diameter of 77 mm this lens deserves a good quality filter, this is commonly filter size, provides a range of filter options. 104 mm long, requires consideration if you want to carry in the camera bag.