Zoom ratio

10x

Built-in optical extender

1.5x

Focal length

25-250mm 

(with Extender)
37.5-375mm

Maximum diameter ratio (T-number)

T2.95 at 25 - 187 mm / T3.95 at 250 mm 

(with Extender)
T4.4 at 37.5 - 281 mm / T5.9 at 375 mm

Number of iris blades

11 Blades

Angle of view

Aspect Ratio 1.78: 1     (Sensor Size 24.6 x 13.8mm)
52.4⁰ x 30.9⁰ at 25 mm
5.6⁰ x 3.2⁰ at 250 mm 

(with Extender)
36.3⁰ x 20.9⁰ at 37.5 mm
3.8⁰ x 2.1⁰ at 375 mm

Aspect Ratio 1.9:1     (Sensor Size 26.2 x 13.8mm)
55.3⁰ x 30.9⁰ at 25 mm
6.0⁰ x 3.2⁰ at 250 mm 

(with Extender)
38.5⁰ x 20.9⁰ at 37.5 mm
4.0⁰ x 2.1⁰ at 375 mm

Aspect Ratio 1.9:1     (Sensor Size 38.1 x 20.1mm)
Full Frame (with Extender only)
53.9⁰ x 30.0⁰ at 37.5 mm
5.8⁰ x 3.1⁰ at 375 mm

Aspect Ratio 1.5:1     (Sensor Size 36 x 24mm)
Full Frame (with Extender only)
51.3⁰ x 35.5⁰ at 37.5mm
5.5⁰ x 3.7⁰ at 375 mm

Minimum shooting distance

1.2 m / 4.0'

Shooting range at closest approach

Aspect Ratio 1.78: 1     (Sensor Size 24.6 x 13.8mm)
86.5 x 48.5 cm at 25 mm
8.7 x 4.9 cm at 250 mm 

(with extender)
57.7 x 32.3 cm at 37.5 mm
5.8 x 3.3 cm at 375 mm

Aspect Ratio 1.9:1     (Sensor Size 26.2 x 13.8mm)
92.1 x 48.5 cm at 25 mm
9.3 x 4.9 cm at 250 mm 

(with extender)
61.4 x 32.3 cm at 37.5 mm
6.2 x 3.3 cm at 375 mm

Aspect Ratio 1.9:1     (Sensor Size 38.1 x 20.1mm)
Full Frame (with Extender only)
89.3 x 47.1 cm at 37.5 mm
9.0 x 4.8 cm at 375 mm

Aspect Ratio 1.5:1     (Sensor Size 36 x 24mm)
Full Frame (with Extender only)
84.4 x 56.2 cm at 37.5 mm
8.5 x 5.7 cm at 375 mm

Front diameter

Ф114 mm

Outer dimensions（w x h x d）

EF Mount
Approx. 7.6 x 5.2 x 11.1 in. /
Approx. 186.7 x 131.7 x 282.1 mm
PL Mount
Approx. 7.6 x 5.2 x 10.8 in. /
Approx. 186.7 x 131.7 x 274.1 mm

Weight

Approx. 6.7 lbs. / 3.06 kg