Comparison of Nikon 18-55mm f/3.5-5.6G VR AF-S DX Nikkor and Pentax 20-40mm ƒ/2.8-4 ED Limited DC WR HD DA

Attribute	Nikon 18-55mm f/3.5-5.6G VR AF-S DX Nikkor ×	Pentax 20-40mm ƒ/2.8-4 ED Limited DC WR HD DA ×
Closest Focus (m)	0.28	0.28
Magnification Ratio (x)	0.31	0.2
Length (mm)	79.5	68.5
Front Element Rotation	-	-
Diagonal Angle of View (degree)	28.80 - 76.00	39.00 - 70.00
Focus Details	AF-S "Silent Wave" motor	Quick-shift Focus; DC focus motor
Focal Length (mm)	18.00 - 55.00	20.00 - 40.00
Aperture (f)	3.50 - 36.00	2.80 - 32.00
Brand	Nikon	Pentax
Image Circle	APS-C	APS-C
Name	Nikon 18-55mm f/3.5-5.6G VR AF-S DX Nikkor	Pentax 20-40mm ƒ/2.8-4 ED Limited DC WR HD DA
Weight (g)	265	283
Type	Standard Zoom	Standard Zoom
Filter Size (mm)	52	55
APS Equivalent	27.5 - 84mm	30.5 - 61.5mm
Notes	Image Stabilized. DX Nikkor for use with Nikon Digital SLR models only. Optional circular lens hood.	HD coating, SP (Super Protect) coating; Weather-resistant construction
Diaphragm Blades	7	9
Diaphragm Blades Type	rounded	rounded
Lens Construction	11 elements in 8 groups, including 1 aspherical element	9 elements in 8 groups, including 1 ED and 1 SLD element
Zoom System	Rotary	Rotary
Diameter (mm)	73	71