Comparison of Olympus 50-200mm f/2.8-3.5 ED SWD Zuiko Digital and Pentax 300mm f/4 ED IF SDM SMC DA*

Attribute	Pentax 300mm f/4 ED IF SDM SMC DA* ×	Olympus 50-200mm f/2.8-3.5 ED SWD Zuiko Digital ×
Notes	Included Accessories: PH-RBK Hood, Detachable Tripod Mount, Case	Dust and drip proof. Includes Lens Hood (LH-70C) and Lens Case (LSC-1220)
Aperture (f)	4.00 - 32.00	2.80 - 22.00
Magnification Ratio (x)	0.24	0.21
Filter Size (mm)	77	67
APS Equivalent	450mm	-
Closest Focus (m)	1.4	1.2
Focal Length (mm)	300.00	50.00 - 200.00
Zoom System	-	Rotary
Brand	Pentax	Olympus
Image Circle	APS-C	Image Circle
Name	Pentax 300mm f/4 ED IF SDM SMC DA*	Olympus 50-200mm f/2.8-3.5 ED SWD Zuiko Digital
Weight (g)	1070	995
Type	Telephoto Prime	Telephoto Zoom
Diaphragm Blades Type	-	circular
Diaphragm Blades	9	9
Diagonal Angle of View (degree)	5.40	6.20 - 24.00
Lens Construction	8 elements in 6 groups	16 elements in 15 groups, including 3 ED elements
Diameter (mm)	83	86.5
Length (mm)	184	157
Focus Details	Internal, SDM (Supersonic Motor) with Quick-shift Focus System	-
35mm Equivalent	-	100 - 400mm