Comparison of Canon EF 24-105mm f/4L IS II USM and Pentax SMC P-FA 28-70mm f/2.8

Attribute	Canon EF 24-105mm f/4L IS II USM ×	Pentax SMC P-FA 28-70mm f/2.8 ×
Filter Size (mm)	77	67
Closest Focus (m)	0.45	0.43
Magnification Ratio (x)	0.23	0.25
Length (mm)	118	104
Focus Details	Inner focusing; AF with USM, full-time manual focus	-
Diaphragm Blades Type	rounded	-
Zoom System	Rotating	Rotary
Image Circle	35mm	35mm
Focal Length (mm)	24.00 - 105.00	28.00 - 70.00
Name	Canon EF 24-105mm f/4L IS II USM	Pentax SMC P-FA 28-70mm f/2.8
Brand	Canon	Pentax
Weight (g)	795	800
Type	Standard Zoom	Standard Zoom
Lens Construction	17 elements in 12 groups, including 4 glass-molded (GMo) aspherical elements on 5 surfaces	14 elements in 11 groups
Notes	4-stop image stabilization; dust and moisture resistant	Included Accessories: Lens Hood and Case
APS Equivalent	38 - 168mm	42 - 105mm
Aperture (f)	4.00 - 22.00	2.80 - 22.00
Diaphragm Blades	10	-
Diagonal Angle of View (degree)	23.30 - 84.00	34.50 - 75.00
Diameter (mm)	83.5	84