Comparison of Canon EF-S 55-250mm ƒ/4-5.6 IS STM and Pentax 55-300mm f/4-5.8 ED SMC DA

Attribute	Pentax 55-300mm f/4-5.8 ED SMC DA ×	Canon EF-S 55-250mm ƒ/4-5.6 IS STM ×
Notes	Included Accessories: Lens Hood	Image Stabilization with up to 3.5 f-stops of correction; EF-S lens mount, exclusively for bodies with APS-C sensors.
Magnification Ratio (x)	0.28	0.29
Filter Size (mm)	58	58
Length (mm)	111.5	111.2
Closest Focus (m)	1.4	0.85
Diagonal Angle of View (degree)	5.40 - 29.00	6.30 - 27.80
Focus Details	Quick-shift Focus System	Rear focusing with Stepping Motor (STM); Full-time manual focus available
Focal Length (mm)	55.00 - 300.00	55.00 - 250.00
APS Equivalent	82.5 - 450mm	88 - 400mm
Brand	Pentax	Canon
Image Circle	APS-C	APS-C
Name	Pentax 55-300mm f/4-5.8 ED SMC DA	Canon EF-S 55-250mm ƒ/4-5.6 IS STM
Weight (g)	440	375
Type	Telephoto Zoom	Telephoto Zoom
Aperture (f)	4.00 - 32.00	4.00 - 32.00
Diaphragm Blades	6	7
Diaphragm Blades Type	-	circular
Lens Construction	12 elements in 8 groups, including ED elements	15 elements in 12 groups, with 1 UD element
Zoom System	Rotary	Rotary
Diameter (mm)	71	70