Comparison of Olympus 35-100mm f/2 PRO ED Zuiko Digital and Sigma 50-100mm f/1.8 DC HSM Art

Attribute	Olympus 35-100mm f/2 PRO ED Zuiko Digital ×	Sigma 50-100mm f/1.8 DC HSM Art ×
Aperture (f)	2.00 - 22.00	1.80 - 16.00
Diagonal Angle of View (degree)	12.00 - 34.00	16.20 - 31.70
Filter Size (mm)	77	82
Notes	Includes Lens Hood (LH-82) and Lens Case (LSH-1326)	Available AF Mounts: Canon EF-S, Nikon F, Sigma SA; Included Accessories: Lens hood, lens caps, tripod collar. Compatible with Sigma USB Dock.
Focus Details	-	HSM (Hyper Sonic Motor) with full-time manual focus override
Type	Telephoto Zoom	Telephoto Zoom
Diaphragm Blades	9	9
35mm Equivalent	70 - 200mm	-
Image Circle	Image Circle	APS-C
Focal Length (mm)	35.00 - 100.00	50.00 - 100.00
Brand	Olympus	Sigma
Name	Olympus 35-100mm f/2 PRO ED Zuiko Digital	Sigma 50-100mm f/1.8 DC HSM Art
Weight (g)	1650	1491
Zoom System	Rotary	Rotary
Lens Construction	21 elements in 18 groups, including 1 Super ED element and 4 ED elements	21 elements in 15 groups, including 3 FLD (F Low Dispersion) glass elements, 1 SLD (Special Low Dispersion) glass element, and 1 high-refractive inde
Diameter (mm)	96.5	94
Closest Focus (m)	1.4	0.95
APS Equivalent	-	1.5x: 75 - 150mm; 1.6x: 80 - 160mm
Length (mm)	213.5	170.2
Diaphragm Blades Type	-	rounded
Magnification Ratio (x)	0.09	0.15