Zoom binoculars has many advantages, searching target with low magnification and watching the details of the target with high magnification, which fulfill the role of binoculars. However, the product cost of the zoom binoculars is high; the assembly is difficult, and failure rate is high during transport and use. In order to reduce the cost, some supplier use low-cost optical materials which reduce the clarity of the binoculars. Yunnan Yuanjin Optical Co. Ltd. improves the traditional zoom binoculars, adopts good optical materials and best optical design. without greatly improve the cost of telescope case, change the appearance, optical performance and stability of zoom binoculars is greatly improved with seldom products costs increasing.
OUTLOOK YJT 8-21X50 zoom binoculars is a model of cost-effective products. It’s easy and quick to find the target, has clear view and good depth of field watching with 21x magnification.
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Product Type
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YJT 8-21×50
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Magnification
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8x~21x
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Body material
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Aluminum alloy
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Armor material
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Rubber(NBR+PVC)
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Color
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Black
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Objective lens Ø
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Φ50 ± 1mm
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Ocular lens Ø
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Φ20 ± 1mm
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Exit pupil Ø
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Φ6.2mm~Φ2.3mm ± 10%
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Exit pupil distance (mm)
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22mm~16.5mm
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Field of view (°)
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4.4°~1.7°
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Field of view (at 1000M)
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76m~30m
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Field of view (at 1000yds)
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228ft~90ft
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Near focus
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Diopter system
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Right diopter ring
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Interpupillary distance
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58～73mm
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Focus System
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Center Focus
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Focusing lens
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Eyepiece focusing
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Diopter compensation
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-4 To +4 Diopter
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Focusing Adjustment
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-4 To +8 Diopter
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Prism System
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Paul prism
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Prism Glass Material
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K 9
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Optical Configuration
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Objective lens
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2E1G
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Ocular lens
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4E3G
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Lens Type
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Spherical Lens
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Optical Material
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All optical glass
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Lens coating
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Coating Condition
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Eyepiece, objective lens
Coated with wideband green film
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Coating Spec.
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420-680nm,R＜0.5%(AVG)
420-680nm,R＜1.0%(ABS)
Blue film 550nm（MGF2)
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prism coating
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Coating Condition
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Blue film
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Coating Spec.
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550nm（MGF2)
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Water/Fogproof
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□ Yes ▇ No
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Gas Filled
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□ Nitrogen □ Other
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Eye cup
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Type
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▉Twist up □Fold down
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Material
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Rubber(NBR)
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eye caps
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Type
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▉Connect □ Monomer □ Other
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Material
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Rubber(NBR+PVC)
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Obj. Cover
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Type
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▉Connect □ Monomer □ Other
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Material
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Rubber(NBR+PVC)
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Adapt to tripod
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▉Yes □ No
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Strap
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▉Yes □ No
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Soft case
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Type
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□ Regular ▉ Customized □ Other
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Material
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1200D Soft bag
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strap
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Type
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□ Regular ▉ Customized □ Other
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Material
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25mm Wide webbing
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Cleaning cloth
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▉Yes □ No
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Instruction manual
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▉Yes □ No
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Packaging
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▉Yes □ No
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Size(Length×Width×Height)
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Weight approx
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