High Powered 21mm Roof Prism Binoculars Folding Fully Coated Lenses
8x21mm Roof Prism Binoculars Folding High Powered Binoculars Pocket
telescope
Parameter interpretation of binoculars
1) Specification: The specification of binoculars is represented by
the "magnification ×objective diameter"
2) Magnification: The magnification of binoculars means the ability
to observe closely the object.
3) Objective diameter: The objective diameter is the optical
aperture of binoculars, which is the channel of the external light
entering the telescope.
4) Field:Field is the field of view, generally using"... M/1000M
or"... Degree “ as representation. In general, Edge imaging of
binoculars with large field is inferior to the binoculars with
small field’s, which is basically a contradiction.
5) Exit Pupil: The Exit Pupil is the spot size which is formed by
the image through the binoculars eyepiece, a simple formula:
objective diameter / magnification = Exit Pupil.
6) Eye relief: Exit relief refers to the longest distance of the
eyes away from the eyepiece when you see clearly the whole field.
7) Lightness, also called as Brightness is the brightness of
binoculars imaging.
8) Close quarter:the close quarter is the closest distance between a person and
imaged objective which is observed by binoculars. That is the
binoculars' shortest focusing distance.
Features: |
● 8x Magnification |
● 21mm Objective |
● Wide Field of View: 393ft/131m@1000yds |
● Apparent Field of View: 52.5° |
● Eyecups: Fold-Down |
Characteristics:
1) This is a very portable binoculars.
2) This binoculars has an excellent optical performance.
3) Fully coated prism and lenses.
4) It brings you sharp image.
5) It has attractive appearance design.
Model | BDJ2234 |
Specification | 8x21mm | 10x25mm |
Magnification | 8x | 10x |
Obj.lens (mm) | 21 | 25 |
Eyepiece diameter(mm) | 12 | 12 |
Field Angle | 7.5° | 5.5° |
Field of View @ 1000m | 131m | 96m |
Field of View @ 1000yds | 393ft | 288ft |
Apparent Field of View | 52.5° | 5.5° |
Exit pupil (mm) | 2.6 | 2.5 |
Eye relief (mm) | 8.0 | 10.0 |
Diopter Adjustment | ±4 | ±4 |
Dusk Index | 12.96 | 15.8 |
Relative Brightness | 6.76 | 6.25 |
Prism System | Roof | Roof |
Prism Glass | BK7 | BK7 |
Focus System | Center | Center |
Lens Coating | Fully Multi | Fully Multi |
Eyecups | Fold-Down | Fold-Down |
Size (mm) | 105X34X93 | 108x44x113 |
Weight (g) | 155 | 240 |
F.A.Q. |
Q:1.Can you produce the products with our brand? |
A: We offer logo laser engraved silk-screen printing or sticker
trade make on product, |
and customized package is also available. Specific details can be
discussed. |
Q: 2.How how can I pay the order? |
A: Payment terms are available by Paypal, T/T or Weston Union.
Specific details can be discussed. |
Q: 3. How do you control the quality? |
A: BCI - we have quality control proecess, from procurement,
production, packing to shipment all |
process are under strict control and are fully traceable. |
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