Comparison of Nikon 18-135mm f/3.5-5.6G IF-ED AF-S DX Nikkor and Sigma 18-125mm f/3.5-5.6 DC

Attribute	Nikon 18-135mm f/3.5-5.6G IF-ED AF-S DX Nikkor ×	Sigma 18-125mm f/3.5-5.6 DC ×
Filter Size (mm)	67	62
Notes	DX Nikkor for use with Nikon Digital SLR models only. Included Accessories: HB-32 Hood, CL-0915 Flexible Lens Pouch	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax, Four-Thirds
Closest Focus (m)	0.45	0.5
Magnification Ratio (x)	0.24	0.19
Type	Standard Zoom	Standard Zoom
Length (mm)	86.5	70
APS Equivalent	27 - 202.5mm	1.5x: 27 - 187.5mm; 1.6x: 28.8 - 200mm
Zoom System	Rotary	Rotary
Image Circle	APS-C	Image Circle
Focal Length (mm)	18.00 - 135.00	18.00 - 125.00
Brand	Nikon	Sigma
Name	Nikon 18-135mm f/3.5-5.6G IF-ED AF-S DX Nikkor	Sigma 18-125mm f/3.5-5.6 DC
Weight (g)	385	385
Aperture (f)	3.50 - 38.00	3.50 - 22.00
Diaphragm Blades	7	7
Diagonal Angle of View (degree)	12.00 - 76.00	11.40 - 69.30
Lens Construction	15 elements in 13 groups, including 1 ED and 2 aspherical elements	15 elements in 14 groups, including two aspherical elements and one Special Low Dispersion (SLD) lens
Diameter (mm)	73.5	77.7
Focus Details	Internal; AF-S "Silent Wave" motor with full-time manual focus override feature	Inner focusing system