Tamron SP AF 17-35mm f/2.8-4 Di LD Aspherical (IF) A05
Tamron SP AF 17-35mm f/2.8-4 Di LD Aspherical (IF) A05 is a auto focus wide angle zoom lens for full frame cameras.
Has 7 aperture blades, mid-grade lenses usually have this amount of blades. Having rounded blades provides out of focus circle shape closer to a circle.
77 mm lens filter diameter, commonly filter size, you have plenty of possibilities this lens deserves a good quality filter. Weights 440 grams so plan ahead, carry only if really necessary. 86 mm long, requires consideration if you want to carry in the camera bag.