Comparison of Panasonic 70-200mm f/4 OIS Lumix S Pro (S-R70200) and Tamron 70-200mm f/2.8 Di LD IF Macro SP AF

Attribute	Tamron 70-200mm f/2.8 Di LD IF Macro SP AF ×	Panasonic 70-200mm f/4 OIS Lumix S Pro (S-R70200) ×
Notes	Available mounts: Canon, Nikon, Pentax, Sony; Included accessories: Petal-shaped lens hood	O.I.S. Image Stabilization (Dual I.S. 2 compatible); Dust/splash-resistant
Magnification Ratio (x)	0.32	0.25
Filter Size (mm)	77	77
Length (mm)	194.3	179
Closest Focus (m)	0.95	0.92
Diagonal Angle of View (degree)	12.30 - 34.30	12.00 - 34.00
Focus Details	Internal Focusing; One-touch AF/MF Switchover mechanism (for Canon and Nikon only)	Internal AF with linear motor; AF/MF clutch mechanism
Focal Length (mm)	70.00 - 200.00	70.00 - 200.00
APS Equivalent	1.5x: 105 - 300mm; 1.6x: 112 - 320mm	105 - 300mm
Brand	Tamron	Panasonic
Image Circle	35mm	35mm (L-Mount)
Name	Tamron 70-200mm f/2.8 Di LD IF Macro SP AF	Panasonic 70-200mm f/4 OIS Lumix S Pro (S-R70200)
Weight (g)	1100	985
Type	Telephoto Zoom	Telephoto Zoom
Aperture (f)	2.80 - 32.00	4.00 - 22.00
Diaphragm Blades	9	9
Diaphragm Blades Type	-	circular
Lens Construction	18 elements in 13 groups, including 3 LD (low dispersion) elements	23 elements in 17 groups, including 1 aspherical, 1 UED, 1 UHR and 3 ED elements; Fluorine coating on front element.
Zoom System	Rotary	Rotary
Diameter (mm)	89.5	84.4