Pentax Binoculars, XCF, Specification 

8x40 XCF

10x50 XCF

12x50 XCF

16x50 XCF

Prism

Porro

Porro 

Porro 

Porro 

Focus

Centre

Centre

Centre

Centre

Magnification

8

10

12

16

Obj. Lens

40

50

50

50

Exit Pupil

5.0

5.0

4.2

3.1

Brightness

25.0

25.0

17.6

9.6

Eye Relief

13.0

13.0

11.0

13.0

Focus  Range

6.0mtr

9.0mtrs

9.0mtrs

10.3mtrs

Field of view @ 1000mtrs

143

114

98

61

Height (mm)

131

166

166

166

Width (mm)

187

198

198

198

Weight

770g

870g

870g

900g