Sigma 17-50mm f/2.8 ex dc os
focal length 17 - 50mm
aperture maximum: f/2.8
minimum: f/22
camera mount type nikon f
format compatibility nikon dx
fx in dx crop mode
angle of view 72.4° - 27.9°
minimum focus distance 11" (27.94 cm)
magnification 0.20x
maximum reproduction ratio 1:5
optical design 17 elements in 13 groups
diaphragm blades 7