Features: Model# PCF12-36X40: 1) Power: 12x-36x 2) Objective lens: 40mm 3) Type of prism: Porro 4) Exit pupil: 1.1-3.3mm 5) Minimum focus distance: 7m 6) Field of view:(angle): 1.5-3.6° 7) Field of view:(m or ft.): 26-63m or 78-189\'\' 8) Eye relief: 8.9-10.5mm 9) Size:160 x 71 x 51mm Model# PCF7X40: 1) Power: 7x 2) Objective lens: 40mm 3) Type of prism: Porro 4) Exit pupil: 5.7 5) Minimum focus distance: 5m 6) Field of view:(angle): 6.8° 7) Field of view:(m or ft.): 118m or 354\'\' 8) Eye relief: 15mm 9) Size: 160 x 71 x 51mm