Comparison of Panasonic 100-300mm f/4-5.6 ASPH Mega O.I.S. Lumix G Vario and Pentax 55-300mm f/4-5.8 ED WR HD DA

Attribute	Panasonic 100-300mm f/4-5.6 ASPH Mega O.I.S. Lumix G Vario ×	Pentax 55-300mm f/4-5.8 ED WR HD DA ×
Diagonal Angle of View (degree)	4.10 - 12.00	5.40 - 29.00
Notes	Additional features: Mega O.I.S. Image Stabilization; Included accessories: lens hood, storage bag.	Weather resistant; PENTAX SP coating protects exposed lens elements; Included Accessories: lens hood, lens cap, rear lens cap, soft lens case.
Aperture (f)	4.00 - 22.00	4.00 - 32.00
Magnification Ratio (x)	0.21	0.28
Filter Size (mm)	67	58
35mm Equivalent	200 - 600mm	-
Type	Telephoto Zoom	Telephoto Zoom
Diaphragm Blades	7	6
Lens Construction	17 elements in 12 groups, including 1 ED element	12 elements in 8 groups, including ED elements
Image Circle	Micro Four-Thirds	APS-C
Focal Length (mm)	100.00 - 300.00	55.00 - 300.00
Brand	Panasonic	Pentax
Name	Panasonic 100-300mm f/4-5.6 ASPH Mega O.I.S. Lumix G Vario	Pentax 55-300mm f/4-5.8 ED WR HD DA
Weight (g)	520	466
Zoom System	Rotary	Rotary
Focus Details	Internal focus with stepper motor	Quick-shift Focus System
Diameter (mm)	73.6	71
Length (mm)	126	111.5
APS Equivalent	-	82.5 - 450mm
Closest Focus (m)	1.5	1.4