Comparison of Pentax 100mm f/2.8 Macro SMC D FA WR and Tamron SP AF 90mm f/2.8 Di Macro 1:1

Attribute	Tamron SP AF 90mm f/2.8 Di Macro 1:1 ×	Pentax 100mm f/2.8 Macro SMC D FA WR ×
Filter Size (mm)	55	49
Closest Focus (m)	0.29	0.3
Magnification Ratio (x)	1	1
Length (mm)	97	80.5
Front Element Rotation	-	-
Diaphragm Blades Type	-	rounded
Focus Details	External focus system, lens length varies while focusing	Quick-Shift Focus System
Focal Length (mm)	90.00	100.00
APS Equivalent	1.5x: 135mm; 1.6x: 144mm	150mm
Brand	Tamron	Pentax
Image Circle	Image Circle	35mm
Name	Tamron SP AF 90mm f/2.8 Di Macro 1:1	Pentax 100mm f/2.8 Macro SMC D FA WR
Weight (g)	405	340
Type	Telephoto Prime Macro	Telephoto Prime (Macro)
Notes	Available mounts: Canon, Minolta, Nikon, Pentax; Includes lens hood and case.	Simplified Weather-resistant Construction; Included Accessories: Hood, Case and Lens Cap
Diaphragm Blades	9	8
Aperture (f)	2.80 - 32.00	2.80 - 32.00
Lens Construction	10 elements in 9 groups	9 elements in 8 groups
Diagonal Angle of View (degree)	27.00	24.50
Diameter (mm)	71.5	65