Comparison of Pentax SMC P-FA 100mm f/3.5 Macro and Tamron AF 28-105mm f/4-5.6 IF

Attribute	Tamron AF 28-105mm f/4-5.6 IF ×	Pentax SMC P-FA 100mm f/3.5 Macro ×
Weight (g)	305	221
Type	Standard Zoom	Telephoto Prime
Brand	Tamron	Pentax
Name	Tamron AF 28-105mm f/4-5.6 IF	Pentax SMC P-FA 100mm f/3.5 Macro
Diameter (mm)	71	67.5
Image Circle	35mm	35mm
Lens Construction	15 elements in 12 groups	5 elements in 4 groups
Notes	Available AF Mounts: Canon, Minolta, Nikon; Included Accessories: Lens Hood	-
Magnification Ratio (x)	0.18	0.5
Closest Focus (m)	0.5	0.43
Filter Size (mm)	62	49
Aperture (f)	4.00 - 22.00	3.50 - 22.00
Diagonal Angle of View (degree)	-	24.50
Focus Details	Internal	-
APS Equivalent	1.5x: 42-157.5mm; 1.6x: 44.8-168mm	150mm
Diaphragm Blades	6	-
Focal Length (mm)	28.00 - 105.00	100.00
Zoom System	Rotary	-
Length (mm)	73	71