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BT25-40x100 Large Diameter Viewing Binoculars

 25/40x100 binoculars for astronomySemi-apo tripot objective,
27 layer max-transsuper multi-coating on allair to glass surfaces
Inter-changeable eyepieces (standard accessory 20x, optional 30x, 40x)
Retractable lens shades

 40x100天文双筒望远镜

半消色差三棱镜物镜

所有空气-玻璃界面均采用27层超透光多层镀膜

可更换目镜（标配20倍，可选30倍、40倍）

可伸缩镜头遮光罩

Lens covers
Removable carrying handle aluminum,
1/4 20 tripod adapter (built-in)
Sturdy aluminum construction
Comfortable right angle viewing

镜头盖

可拆卸铝制提手

1/4 20三脚架适配器（内置）

坚固铝制结构

舒适直角视角

20x eyepieces has a 52 degree F. O. V.,
The 40x eyepieces has a 66 degree F. O. V.
The eyepieces and objectives are matched to produce superbly sharp images.  

20倍目镜具有52度视场角，

40倍目镜具有66度视场角。

目镜与物镜经过精密匹配，可呈现极其锐利的图像。      

大口径系列观景望远镜是边防哨所、森林、草原防火、航运、渔业等各种远距离观察活动的良好助手，还适用于旅游景点，高层建筑、家庭露台上观赏景物。

Series large diameter viewing binoculars are good assistant in long range observation activity, such as frontier defense, forest and grassland fire proofing, shipping, fishery. They are also suitable for sightseeing in scenic spots and viewing on high buildings and balcony.

◆ 放大倍率／Magnification：25x、40x

◆ 视场／Field of view：2°30'（25x）、 1°30'（40x）

◆ 物镜孔径／Objective diameter：100mm

◆ 视度范围：正负5屈光度 ／Eyepiece diopter range: -5~+5 diopters

◆ 出瞳直径／Exit pupil diameter：4mm/ 2.5mm

◆ 出瞳距离／Exit pupil distance：14mm/ 8.2mm

◆ 分辨率／Resolution：≤2.4''

◆ 目距范围／Interpupillary distance：58-72mm

◆ 主机净重／Net Weight：8 KGS (Main body)

◆ U架净重／Net Weight：6.5 KGS (U-mount)

◆ 三脚架净重／Net Weight：6KGS (Wooden tripod)

◆ 包装尺寸及重量／Packing size and weight: 56X44X26cm,12kg（主机 Main body）

46X49X15cm,7.5kg(U型支架 U-mount)

103X24X24cm, 7kg（三脚架 Wooden tripod）