Gunsmithing - How to Choose A Rifle Scope Presented by Larry Potterfield...

Good video for those riflescope fans who just get started to learn riflescope.

Objective lens diameter

Objective lens diameter is the diameter of the objective or front lens measured in millimeters(mm). this figure is generally shown at the second figure in a scope configuration. For example, a 4x32 scope has a magnification power of 4 and a 32mm diameter objective lens. A 6x42 has a 42mm diameter objective lens.

The lines in the image above depict the objective lens diameter and how it’s measured. Objective lens diameter is also considered a measure of the amount of light that can enter a scope. Objective lens generally range anywhere from 32mm all the way up to 75mm. the larger the objective lens, the more light than can enter the scope.

Notice the amount of light in the 50mm compared to the 32mm? please understand that larger objective lens will only transmit more light when they are set on their highest power. So if you took a 6x42 scope and a 8x50 scope made by the same manufacturer, the 50mm model is only going to pull more light than the 42mm when the 50mm is set above six power.

Keep in mind that the higher you go in objective lens diameter, the larger the lens will be in size and heavier it will weigh. Also realize that some of objective lens that exceed 48mm or so may require special rings and bases for mounting as they will have to mounted high off the rifle. This higher mounting can impact eye relief and result in a less than comfortable position during shooting. For most applications, 38mm to 48mm will work just fine. Most hunter will got a scope with a 50mm lens and it’s only used for long range shooting.

For more Beretac rifle scope, click:  www.beretac.com

Beretac Optic 4in1 Combo 3-9x32 EG Red & Green Reticle Rifle Scope 4 Postitions Reticle Red Dot Reflex sight with Quick Release Mount Tactical Red Laser Beam Riser Mount 0.83" High13 Slots for Hunting

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                               www.beretac.com

Product Description:

 Matte Black finish, tube was made of metal, shock-proof, obviously increase aiming speed, accuracy and percentage of hits -Magnification zoom range 3X--9X,objective diameter 32mm,wide field of view -Nitrogen filled, preventing internal moisture, fog-proof and waterproof -Red and green reticle, strong/weak light ray (could adjustable by your need) settle for different Environment in the night use -Multi-layer Emerald Bright Coated on the lens for Optimum Light Transmission-Upper Hand wheel Cover Right Hand wheel Cover Distance Ring -5 Levels of Brightness for red and Green make this scope work effectively under low light condition. 

Beretac 3-9×32eg rifle scope specification 
Magnification:3x-9x 
Objective Diameter(mm):323 
Eye Relief(mm):40 
Tube Diameter(mm):69.1-85.09 
Pipe diameter(mm):25.4 
Field of View(ft.@100yds):13.41-40.38 
Reticle Color:Red and Green Illumination,each in 5 level controls 
Reticle Type:Range Finder Graph 
Coating:Blue Coating 
Shock Proof:Yes 
Focus Ring Adjustable:Yes 
Nitrogen Filled/Water Proof and Fog Proof:Yes 

Beretac reflex red dot sight specification 
Ratio: 1 
The aperture of the objective(mm):22 
View(m@100m): 15.8 
Guide(mm): 22/11 
Differentiation model: 4 
Differentiation of silk color: red and green 
Gear: buttons 
Product size(mm): 41.5*21.5*33 

Red Laser sight JG5 
Laser types: red laser 
Laser Range(m):50-100 
The maximum output power(mw): less than 5 
Wavelength(nm): 625~660 
Tube Diameter(mm):58 
Windage and elevation adjustable 
Standard rail 

Riser Mount, 0.83" High, 13 Slots 
Material: Aluminum 
Weight(ounces):6.1 
Rail Type: Picatinny/Weaver 
No. of Rails: 1 
Dimensions(inches (L x W)): 5.7 by 1.75

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