Cart 0

What Is A Binocular? Binocular Is A Simple Optical Device That Is Designed To Bring An Object Closer To View. Binocular Can Provide A Better 3D Like Vision By Using Of Both Eye For Viewing And It Provide The Best Viewing Experience

 

Here Is What A Basic Of Binocular Beginner Must Understand

 

Numbering And Symbol In Binocular Means

  1. Most Beginner Will Be Wondering What Is 8x21 Or 10x50 Means. Generally Most Beginner Will Calculate Power By Just Simply Multiple It (i.e. 8x21 : 168x Power, 10x50 : 500x Power) But This Is Grossly Wrong. 
  2. Here Is What Those Value Means
  • 8x21 : 8 Magnification, 21mm Objective. 10x50 : 10x Magnification, 50mm Objective
  • 6.0° FOV Is Field Of View In Degree. A Bigger Number Means A Wider Area Of Coverage When Viewing Thru A Binocular
  • Linear FOV (i.e. 131m @ 1000m) Means A Linear Area Of 131m Width Can Be Seen Using This Binocular When Object Is At 1000m Away. A Higher Number Indicated A Wider Are Coverage When Viewing Thru A Binocular

 

  1. Other Important Things To Know About Binocular
  • Coatings : Coatings Is An Anti Reflective Layer On Surface Glass That Enhances The Light Transmission Of A Glass. A Uncoated Glass Reflect 4% Light Per Surface (8% Light Loss In Normal Glass Due To Reflection, 2 Surface)
  • The Best Coating Is Fully Multi-Coated (Each And Every Layer Of Air-Glass Surface Is Coated With Multiple Layer Of Anti-Reflective Coatings) Some Binocular Might Have Only Fully-Coated Optics (At Least A Coating Layer On Each Surface Of Glass) Or Multi-Coated (At Least A Multiple Layer Of Coatings On At Least 1 Surface Of Glass)
  • Phase Coating : In A Roof Prism, Due To The Prism Orientation, There Will Be Optical Interference And Distortion. A Phase-Correcting Coating Will Elimate The Optical Distortion By Correcting The Interference Effect. Phase Distortion Only Occurs In Roof Prism. No Effect On Porro Prism Design
  • Bak4 Prism And Bak7 Prism : BaK Stands For Barium-Krown (BaK) Which Is The Reflective Index Of A Prism. A Higher Index Will Have A Smaller Critical Angle And Provide Full Internal Reflection. This Is Only Important To Ensure A Full Circle Of Illumination To Reduce Vignetting Effect. BaK7 Can Allow Full Illuminated Circle Up To About 48-50mm Depends On The Prism Size
  • Roof VS Porro Prism. The Most Basic Binocular Design Are Porror Prism. This Incooperate 2 Prism To Reflect The Light And Correct It's Image Position. Provide A Very Good Sharp Image And Clarity. A Roof Prism Is More Compact Than Standard Porro Prism Due To Its Design, However It Has Compromise Due To Interference Path Of Light Inside Its Prism Causing Out Of Phase Lightwave. This Problem Reduces Image Sharpness And Contrast Slightly, But Can Be Corrected By Phase Correction Coating
  • Eye Relief : Eye Relief Is The Most Comfortable Distance Between The Eye And Also The Eyepiece Lens Of A Binocular To Provide A Fully Illuminated Field Of View Without Vignetting Or Black-Out. Those Who Are Using Eye Wear Benefit From Long Eye Relief As There Is No Need To Remove The Glasses When Using A Long Eye Relief Binocular
  • Pupil Exit : A Pupil Exit Is The Width Of The Light Output. The Larger The Pupil Exit, The Brighter Is The Objects Appears. The Maximum Effective Pupil Exit Will Be Around 7mm. A Smaller Pupil Object Translate To Dimmer View. Pupil Exit : Objective Diameter/Magnification

 

Popular Misconception Or False Rate Binocular By Manufacturer

  1. Optical Rating : i.e.120x200,200x500, 80x120,100x200 etc. These Will Confuse Consumer As Inaccurate Rating Does Not Provide The Real Performance Of Binocular, In Fact This Only Translate To A Poor Or Low Quality Design. Why Are These Rating Falsely Rate And Unlikely To Be Real? Imaging The 200mm - Translate To 20cm (8'') Size Of each Objective Of Binocular. Does The Binocular Appears To Have A 20cm Objective. Typical Weight Of A 20cm Binocular Exceed 60Kg, Which Is Not Designed To Handheld 

A Typical 150mm Binocular. A 200mm Binocular Is Larger Than This. Does Your 120x200 Binocular Look Bigger Than This Or Small? Can You Lift A 60Kg Binocular Hand Held? Make Your Personal Judgement To Know About Real Performance Rating Of Binocular. Even a 220x120 Binocular With Real 120mm Objective Weight 12Kg Or More

 

  1. Magnification : All Branded Or Expansive Binocular Have Only Rating Of 8x42, 10x50 etc. There Is No Leica Or Zeiss Being Rated 100x100 etc. A Real 220x120 Rated Binocular, Image Will Be Extremely Dim Plus Impossible To Handheld. Higher Magnification Translate To Need For More Stability. 7X Binocular, If Have Shake Or Movement Of 1mm, Will Have Image Moving Up And Down 3m Difference At 300m. A 220x Binocular With Movement Of 1mm Translate To 22m Meter Movement @ 100m Distance. A Car Height Is About 1.5m. Logical Sense It Is Not Possible To Hand Held A High Power Binocular. Most Expert Agree That Maximum Of 15x Is Upper Limit For Handheld, Anything More Will Be Too Unstable Handheld
  2. Prism Type. Many Manufacuter Claims A BaK4 Is Better Than A BaK7 Prism. Many Unbranded Binocular Are Actually Built With Chinese BK4, Not BaK4. BK4 Has A Lower Refractive Index Than Real BaK4 And Has More Impurity, Leading To Image Softness. A Real Bak4 Prism Binocular Typically Cost More Due To High Manufacturing Cost Of BaK4 (Real BaK4 Is Manufactured By Schott AG, Germany). High Quality BaK7 Binocular Will Perform Better Than A Low Quality BK4 Binocular