Comparison of Panasonic 70-200mm f/4 OIS Lumix S Pro (S-R70200) and Pentax SMC DA* 50-135mm f/2.8 ED AL IF SDM

Attribute	Panasonic 70-200mm f/4 OIS Lumix S Pro (S-R70200) ×	Pentax SMC DA* 50-135mm f/2.8 ED AL IF SDM ×
Notes	O.I.S. Image Stabilization (Dual I.S. 2 compatible); Dust/splash-resistant	Included Accessories: Lens Hood
Magnification Ratio (x)	0.25	0.17
Filter Size (mm)	77	67
Length (mm)	179	136
Closest Focus (m)	0.92	1
Diagonal Angle of View (degree)	12.00 - 34.00	11.90 - 31.50
Focus Details	Internal AF with linear motor; AF/MF clutch mechanism	Internal with "Quick Shift" AF/MF mechanism
Focal Length (mm)	70.00 - 200.00	50.00 - 135.00
APS Equivalent	105 - 300mm	76.5 - 207mm
Brand	Panasonic	Pentax
Image Circle	35mm (L-Mount)	APS-C
Name	Panasonic 70-200mm f/4 OIS Lumix S Pro (S-R70200)	Pentax SMC DA* 50-135mm f/2.8 ED AL IF SDM
Weight (g)	985	685
Type	Telephoto Zoom	Telephoto Zoom
Aperture (f)	4.00 - 22.00	2.80 - 22.00
Diaphragm Blades	9	9
Diaphragm Blades Type	circular	-
Lens Construction	23 elements in 17 groups, including 1 aspherical, 1 UED, 1 UHR and 3 ED elements; Fluorine coating on front element.	18 elements in 14 groups, including 3 ED elements
Zoom System	Rotary	Rotary
Diameter (mm)	84.4	76.5