Comparison of Canon EF 28-105mm f/4-5.6 USM and Pentax SMC P-FA 28-90mm f/3.5-5.6

Attribute	Canon EF 28-105mm f/4-5.6 USM ×	Pentax SMC P-FA 28-90mm f/3.5-5.6 ×
Aperture (f)	4.00 - 32.00	3.50 - 38.00
Magnification Ratio (x)	0.19	0.28
Filter Size (mm)	58	58
Focus Details	Inner focusing; full-time manual focus and USM	-
Closest Focus (m)	0.48	0.4
Lens Construction	10 elements in 9 groups, including 1 aspherical element	8 elements in 10 groups
Length (mm)	68	69
Focal Length (mm)	28.00 - 105.00	28.00 - 90.00
APS Equivalent	45 - 168mm	42 - 135mm
Brand	Canon	Pentax
Image Circle	35mm	35mm
Name	Canon EF 28-105mm f/4-5.6 USM	Pentax SMC P-FA 28-90mm f/3.5-5.6
Weight (g)	210	196
Type	Standard Zoom	Standard Zoom
Diagonal Angle of View (degree)	23.30 - 75.00	27.00 - 75.00
Diaphragm Blades	6	-
Zoom System	Rotary	Rotary
Diameter (mm)	67	66