A good telescope of a high-quality brand uses strictly inspected optical glass and high-level optical processing. It is an excellent choice to enjoy the outdoors. And some small manufacturers use some substandard optical glass, or even ordinary glass or resin lenses to assemble, the products have not been strictly debugged, they are fake and inferior products, attracting customers with low prices, so that customers be violated.

MODELS SPEC.                   8x42/10x42                  

01    POWER  8x    10x

02    OBJ.LENS DIA.mm        φ42mm 

03    TYPE OF PRISM     Type / Material      BaK4      

04    PRISM COATING   Yes / No        Phase    

05    NUMBER OF LENS        Pieces & Groups          8pieces6groups    

06    LENS COATING     CL/FC/BMC/FBMC        FMC/Object lens&eyepiece is FBMC 

07    FOCUS SYSTEM            Cent. / Ind. / Fix           Cent.     

08    FOCUSING LENS          Eye. / Obj. / Int.            Int.  

09    EXIT PUPIL DIAMETER  mm        φ5.2 φ4.27

10    EXIT PUPIL DIST.    mm        17.2 15.2

11    FIELD OF VIEW      ANGLE          8.12°       6.5°

12                  Ft/1,000Yds           426ft       340ft

13                  M/1,000M             142m      113m

14    MIN. FOCAL LENGTH          M / Ft.    米 / 尺  2m  2.5m

15    RELATIVE BRIGHTNESS               27.04      18.23

16    TWILIGHT INDEX                        18.3 20.4

17    RESOLUTION               4"   

18    DIOPTER SYSTEM         Right Eyepiece     

19    DIOPTER COMP.           + - Optic.Degree        ±3  

20    INTERPUPILLARY DIST. mm        56mm~74mm      

21    ZOOM SYSTEM     Type & Location                 

22    WEATHER PROOF        Yes / No        yes 

23    WATER PROOF     Depth / Time        1.5m/3 min   

24    NITROGEN FILLED        Yes / No 有或无    yes 

25    EYECUPS SYSTEM        Rubber/Pop-up/Twist-up           Twist-up

26    POUCH         Yes / No - Mat'l.           yes 

27    STRAP           Yes / No - Mat'l.           yes 

28    CLEANING CLOTH        Yes / No        yes 

29    SILICA GEL            Yes / No        yes                             

30    UNIT DIAMENSION mm             170x127x54   

31    UNIT WEIGHT  gm / oz.              860g       850g

32    GIFT BOX SIZE mm                   

33    PIECES PER INNER CARTON  Pieces / Size           

       INNER CARTON SIZE                       

34    PIECES PER SHIPPING CARTON        Pieces                  

35    SHIPPING CARTON SIZE            Size cm         

36    GROSS WEIGHT   Kg. / Pound                

37    NET WEIGHT   Kg. / Pound