Comparison of Olympus 14-45mm f/3.5-5.6 Zuiko Digital and Pentax 20-40mm ƒ/2.8-4 ED Limited DC WR HD DA

Attribute	Olympus 14-45mm f/3.5-5.6 Zuiko Digital ×	Pentax 20-40mm ƒ/2.8-4 ED Limited DC WR HD DA ×
Diagonal Angle of View (degree)	27.00 - 75.00	39.00 - 70.00
Notes	Includes Lens Hood (LH-61); Compatible with TC-14 Teleconverter and EX-25 Extension Tube	HD coating, SP (Super Protect) coating; Weather-resistant construction
Aperture (f)	3.50 - 22.00	2.80 - 32.00
Type	Standard Zoom	Standard Zoom
Filter Size (mm)	58	55
35mm Equivalent	28 - 90mm	-
APS Equivalent	-	30.5 - 61.5mm
Diaphragm Blades	7	9
Lens Construction	12 elements in 10 groups, including 2 asperical elements	9 elements in 8 groups, including 1 ED and 1 SLD element
Image Circle	Image Circle	APS-C
Focal Length (mm)	14.00 - 45.00	20.00 - 40.00
Brand	Olympus	Pentax
Name	Olympus 14-45mm f/3.5-5.6 Zuiko Digital	Pentax 20-40mm ƒ/2.8-4 ED Limited DC WR HD DA
Weight (g)	285	283
Zoom System	Rotary	Rotary
Front Element Rotation	-	-
Diameter (mm)	71	71
Length (mm)	86.5	68.5
Focus Details	-	Quick-shift Focus; DC focus motor
Magnification Ratio (x)	0.26	0.2
Diaphragm Blades Type	-	rounded
Closest Focus (m)	0.38	0.28