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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