Comparison of Pentax 24-70mm f/2.8ED D FA HD SDM WR and Sigma 24-70mm f/2.8 DG DN Art

Attribute	Sigma 24-70mm f/2.8 DG DN Art ×	Pentax 24-70mm f/2.8ED D FA HD SDM WR ×
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Filter Size (mm)	82	82
Notes	Available AF Mounts: L-Mount, E-Mount; Mount with dust- and splash-proof design	Weather Resistant; Included Accessories: Lens hood, lens caps and soft case
Closest Focus (m)	0.18	0.38
Magnification Ratio (x)	0.34	0.2
Zoom System	Rotary (with zoom lock)	Rotary
Type	Standard Zoom	Standard Zoom
APS Equivalent	36 - 105mm	37 - 107mm
Diaphragm Blades	11	9
Image Circle	35mm	35mm
Focal Length (mm)	24.00 - 70.00	24.00 - 70.00
Brand	Sigma	Pentax
Name	Sigma 24-70mm f/2.8 DG DN Art	Pentax 24-70mm f/2.8ED D FA HD SDM WR
Weight (g)	835	787
Diaphragm Blades Type	rounded	rounded
Lens Construction	19 elements in 15 groups, including 6 FLD, 2 SLD and 3 aspherical elements; Super Multi-Layer Coating, Nano Porous Coating.	17 elements in 12 groups, including 3 ED and 4 aspherical elements, HD coating
Diagonal Angle of View (degree)	34.30 - 84.10	34.50 - 84.00
Length (mm)	122.9	109.5
Diameter (mm)	87.8	88.5
Focus Details	Internal focus with stepping motor; AF/MF switch; AFL button	SDM (Supersonic Direct-drive Motor) with Quick-shift focus system