Comparison of Pentax SMC P-DA 12-24mm f/4 ED AL IF and Tamron 10-24mm f/3.5-4.5 Di II VC HLD (BO23)

Attribute	Pentax SMC P-DA 12-24mm f/4 ED AL IF ×	Tamron 10-24mm f/3.5-4.5 Di II VC HLD (BO23) ×
Aperture (f)	4.00 - 22.00	3.50 - 29.00
Filter Size (mm)	77	77
Notes	Included Accessories: Lens Hood	Moisture-Resistant Construction; Image Stabilized (CIPA rated to 4-stops); Included Accessories: Flower-shaped lens hood, lens caps
Closest Focus (m)	0.3	0.24
Magnification Ratio (x)	0.12	0.19
Diameter (mm)	84	83.6
Type	Wide Zoom	Wide Zoom
APS Equivalent	18 - 36mm	1.5x: 15 - 36mm; 1.6x: 16 - 38.4mm
Diaphragm Blades	8	7
Image Circle	APS-C	APS-C
Focal Length (mm)	12.00 - 24.00	10.00 - 24.00
Brand	Pentax	Tamron
Name	Pentax SMC P-DA 12-24mm f/4 ED AL IF	Tamron 10-24mm f/3.5-4.5 Di II VC HLD (BO23)
Weight (g)	430	440
Diagonal Angle of View (degree)	61.00 - 99.00	60.03 - 108.73
Lens Construction	13 elements in 11 groups, including 2 aspherical and 1 ED elements	16 elements in 11 groups, including 1 LD, 1 XLD, 1 aspherical and 1 hybrid aspherical element glass element; eBAND Coating; Fluorine Coating
Zoom System	Rotary	Rotary
Length (mm)	87.5	84.6
Diaphragm Blades Type	-	circular
Focus Details	Internal with "Quick Shift" AF/MF mechanism	Internal with High/Low torque modulated Drive; AF/MF switch