Vivitar 28-105mm f/3.5-4.5

Vivitar 28-105mm f/3.5-4.5 is a manual focus prime zoom 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.

Physical characteristics

Weights 470 grams so plan ahead, carry only if really necessary. 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. 81 mm long, requires consideration if you want to carry in the camera bag.