Comparison of Panasonic 16-35mm f/4 Lumix S Pro (S-R1635) and Tamron SP AF 17-35mm f/2.8-4 Di

Attribute	Panasonic 16-35mm f/4 Lumix S Pro (S-R1635) ×	Tamron SP AF 17-35mm f/2.8-4 Di ×
Notes	Splash- and dust-resistant. Included Accessories: front and rear lens caps, lens hood, storage bag.	Available mounts: Canon, Minolta-D, Nikon-D, Pentax; Includes petal type lens hood.
Magnification Ratio (x)	0.23	0.19
Filter Size (mm)	77	77
Length (mm)	99.6	86.5
Closest Focus (m)	0.25	0.3
Diagonal Angle of View (degree)	63.00 - 107.00	63.00 - 104.00
Focus Details	Internal with double-magnet linear motor; AF/MF clutch mechanism	Internal
Focal Length (mm)	16.00 - 35.00	17.00 - 35.00
APS Equivalent	24 - 52.5mm	1.5x: 25.5 - 52.5mm; 1.6x: 27.2 - 56mm
Brand	Panasonic	Tamron
Image Circle	35mm (L-Mount)	Image Circle
Name	Panasonic 16-35mm f/4 Lumix S Pro (S-R1635)	Tamron SP AF 17-35mm f/2.8-4 Di
Weight (g)	500	440
Type	Wide Zoom	Wide Zoom
Aperture (f)	4.00 - 22.00	2.80 - 22.00
Diaphragm Blades	9	7
Diaphragm Blades Type	circular	-
Lens Construction	12 elements in 9 groups, including 1 UHR (Ultra-High Refractive Index), 1 ED and 3 aspherical elements; Fluorine coating on front element.	14 elements in 11 groups, including one Low Dispersion and three aspherical elements
Zoom System	Rotary	Rotary
Diameter (mm)	85	83.2