AQDWR: Optics

Optics

Primary Carry
	*Zeiss Conquest MiniQuick 5x10 T Monocular** Model: 522010-0000-000 Magnification: 5x Objective: 10mm Optics: anti-reflective multi-coated Angle of View: 5.8° Field of View: 100m @ 1000m Exit Pupil: 2.0mm Eye Relief: 16.5mm Near Focus: 4m Twilight Factor: 7.0 Relative Brightness: 4.0 Length: 113mm (4.5") Diameter: 18mm (0.7") Weight: 23g (0.8oz) Clip: pocket
	Celestron 10x LED Loupe Model: 44801 Magnification: 10x Objective: 21mm Optics: multi-coated glass triplet lens Open Length: 86mm (3.4") Closed Length: 49mm (1.9") Width: 27mm (1.1") Thickness: 24mm (0.9") Weight: 57g (2.0oz) Light: 6 LEDs and diffuser ring around lens Batteries: three LR927
	Best Glide 4x Fresnel Lens Model: WS1196 Magnification: 4x Optics: optical PVC Focal Length: 160mm (6.3") Groove Pitch: 0.2mm (0.008") Length: 83mm (3.25") Width: 51mm (2.0") Thickness: 0.4mm (0.016") Weight: 5.5g (0.2oz) Case Length: 92mm (3.63") Width: 6mm (2.38")

Secondary
	Brunton Echo 10-30x21 Monocular Model: Echo 10-30x21 Magnification: 10-30x Objective: 21mm Optics: BaK-4 / fully multi-coated glass Field of View: 54-34m @ 914m Exit Pupil: 2.4-1.8mm Eye Relief: 12mm Near Focus: 3m Twilight Factor: 14.5-25.1 Relative Brightness: 5.8-3.2 Length: 110mm (4.3") Diameter: 32mm (1.3") Weight: 90g (3.2oz)

General
	Vixen H5-15x17 Monocular Model: 1178-02 Magnification: 5-15x Objective: 17mm Optics: BK-7 Angle of View: 5.5-3.2° Field of View: 96-56m @ 1000m Exit Pupil: 3.4-1.1mm Eye Relief: 13.0-9.0mm Near Focus: 0.2m Twilight Factor: 9.2-16.0 Relative Brightness: 11.6-1.2 Length: 96mm (3.8") Diameter: 32mm (1.3") Weight: 100g (3.5oz)
	Vivitar PV Sport 10x25 Monocular Model: 634720 Magnification: 10x Objective: 25mm Optics: BK-7 / multi-coated Angle of View: 5.9° Field of View: 102m @ 1000m Exit Pupil: 2.5mm Eye Relief: 10.5mm Near Focus: 6.1m Twilight Factor: 15.8 Relative Brightness: 6.3 Length: 112mm (4.4") Diameter: 32mm (1.3") Weight: 82g (2.9oz)
	Nikula 7-21x25 Monocular Model: HX-JKY72125 Magnification: 7-21x Objective: 25mm Ocular: 12mm Optics: BK-7 / fully multi-coated Angle of View: 4.0-2.3° Field of View: 73-44m @ 1000m Exit Pupil: 3.4-1.1mm Eye Relief: 13.0-9.0mm Near Focus: 0.35m Twilight Factor: 13.2-22.9 Relative Brightness: 11.6-1.2 Length: 120mm (4.7") Diameter: 30mm (1.2") Weight: 160g (5.6oz)
	Bushnell Trophy 20-60x63 Spotting Scope Model: 78-7363 Magnification: 20-60x Objective: 63mm Optics: multi-coated Field of View: 27-13.7m @ 1000m Exit Pupil: 3.2-1.1mm Near Focus: 9m Twilight Factor: 36.1-62.4 Relative Brightness: 10.6-1.2 Length: 322mm (12.7") Weight: 570g (20oz)

Exit Pupil:	Divide the objective lens diameter (mm) by the magnification.
Twilight Factor:	Square the exit pupil diameter (mm).
Relative Brightness:	Multiply the objective lens diameter (mm) by the magnification, then find the square root.