Comparison of Leica 50mm f/2 APO-Summicron-M Asph. and Sigma 17-70mm ƒ/2.8-4 DC Macro OS HSM

Attribute	Sigma 17-70mm ƒ/2.8-4 DC Macro OS HSM ×	Leica 50mm f/2 APO-Summicron-M Asph. ×
Aperture (f)	2.80 - 22.00	2.00 - 16.00
Filter Size (mm)	72	39
Notes	Image Stabilized. Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony	Leica M-mount with 6-bit ID bar code; Built-in extendable lens hood.
Closest Focus (m)	0.22	0.7
Magnification Ratio (x)	0.37	0.09
Diaphragm Blades Type	rounded	-
Type	Standard Zoom	Standard Prime
APS Equivalent	1.5x: 25.5 - 105mm; 1.6x: 27.2 - 112mm	1.33x (M8): 66.5mm
Diaphragm Blades	7	11
Image Circle	APS-C	35mm
Focal Length (mm)	17.00 - 70.00	50.00
Brand	Sigma	Leica
Name	Sigma 17-70mm ƒ/2.8-4 DC Macro OS HSM	Leica 50mm f/2 APO-Summicron-M Asph.
Weight (g)	535	300
Diagonal Angle of View (degree)	20.20 - 72.40	47.00
Lens Construction	17 elements in 13 groups, including 1 ELD and 3 aspherical elements	8 elements in 5 groups
Diameter (mm)	79	53
Length (mm)	88.9	47
Zoom System	Rotary with lock	-
Focus Details	Internal, with Hyper-Sonic Motor; AF/MF switch	Manual focus only