Comparison of Pentax 16-85mm f/3.5-5.6 ED DC WR DA and Pentax 17-70mm ƒ/4 AL IF SDM SMC DA

Attribute	Pentax 16-85mm f/3.5-5.6 ED DC WR DA ×	Pentax 17-70mm ƒ/4 AL IF SDM SMC DA ×
Notes	HD Coating, SP (Super Protect) Coating, Weather-Resistant, Quick-shift Focus, Filter Window	Included Accessories: Lens Hood
Magnification Ratio (x)	0.26	0.31
Filter Size (mm)	72	67
Length (mm)	94	93.5
Closest Focus (m)	0.35	0.28
Diagonal Angle of View (degree)	19.00 - 83.00	23.00 - 79.00
Focus Details	Quick-Shift system for fast changing between auto and manual focusing, with ability to manually override focus at any point	Internal; SDM with Quick-shift Focus System
Focal Length (mm)	16.00 - 85.00	17.00 - 70.00
APS Equivalent	24.5 - 130mm	25.5 - 105mm
Brand	Pentax	Pentax
Image Circle	APS-C	APS-C
Name	Pentax 16-85mm f/3.5-5.6 ED DC WR DA	Pentax 17-70mm ƒ/4 AL IF SDM SMC DA
Weight (g)	517	485
Type	Standard Zoom	Standard Zoom
Aperture (f)	3.50 - 38.00	4.00 - 22.00
Diaphragm Blades	7	7
Diaphragm Blades Type	rounded	-
Lens Construction	16 elements in 12 groups, including 1 extra-low dispersion glass element and 3 aspherical elements	17 elements in 12 groups
Zoom System	Rotary	Rotary
Diameter (mm)	78	75