BAK4 V.S. BK7 Fiturbo F1050 is equipped with BAK4 Glass, and why is it a better choice? --The higher refractive index rate and the complete, circular shape of the exit pupil will mean more light will be transmitted to the entire field of view. This will mean brighter, color-rich, and sharper edges of your periphery. On the contrary, BK7 glass has lower refractive index rate compared to BAK4 and will produce distortion around the edge of the exit pupil.Roof V.S. Porro Prism Benefits of Porro Prism Binoculars:• All internal surfaces are reflective - no light loss due to prism system• Only four reflections in porro prism limiting further likelihoods of light loss• 3D-like and rich depth of field• Can spend the same amount on a mediocre roof prism binoculars for a high-quality porro prism• Basic optical quality is superior to roof prism binocularsSpecifications: Product Magnification: 10X Objective lens diameter: 50mm Field of view: 308ft / 1000yd Prism Type: BAK 4, 100% of the reflected light can present clearer and brighter image Lens Coating: FMC Green Coated Focusing system: Central Focusing and right eyecup adjustable Near focus: 16.5ft (5m) Waterproof: Yes Weight: 1.85lb (843g) Size: 196x184mmPackage included: 1 X Fiturbo F1050 Binoculars 1 X Binoculars Belt Case 1 X Cleaning Cloth 1 X Universal Cell phone Adapter Mount 1 X User Manual
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