refractor telescopes manufacturers

Camera Mount Adapter Bracket Smartphone Holder Clip Durable metal bracket, compatible with microscope, telescope, monocular, spotting scope, telephoto lens, etc.Fits eyepiece with diameter 28mm - 62mm; and soft rubbers on the surface keep your eyepiece from scratching.The plastic phone holder with 5-8cm adjustable width fits for iPhone 7 Plus, 7, 6s and other most of smartphones.Moveable smartphone holder, can loose the knob below to adjust it position for ideal shooting angle.Designed to connect telescope/ telephoto lens and compact digital camera or smartphone for more precision photo taking.   Specifications: Material: Metal + Plastic Compatible eyepiece diameter: 28-62mm / 1.1-2.4in Phone Holder Width: 5-8cm / 2-3.1in Item Weight: 330g / 11.6oz      

Flip Caps Flip Caps Object Flip-up Rifle Scope Lens Cover The 23mm,28mm,29mm,32mm,37mm,44mm,45mm,56mm,74mm measurement means the inside diameter of the cover，the cover materials is rubber.please check your scope's outside diameter. Protect your scope lens from scratches & dust. Waterproof and airtight, keeps dust, dirt and weather off lens surfaces Ambidextrous open and close, durable spring hinges operation, open silently with the flick of a thumb Sold one per package.  

  Riflescope 6-24*40AOE Number：YZ9002 Magnification：6-24× Objective lens aperture（mm）：40 Field of View（°）：3-0.73 Exit Pupil(mm)：6.3-1.83 Eye Relief(mm)：89.3-75.86 Click Value atW/E：1/4 Length(mm)：375 Adjusting Way：Manual adjustment Structure：integrated tube Reticle：reticle wire Material：full metal      

Due to increased demand, we temporarily have reduced product selection available for delivery to your region. We are working to improve selection availability as soon as possible. suitalble for 80mm and 90mm refractor telescope 2 inch crayford no pinion single speed Material: Fully Metal Millimeter Markings on Focuser Drawtube: Yes Rotatable: Yes

PRODUCT DETAILS: Features: Optical Design: Refractor Caliber: 80mm Optic Coated: FMC Objective Lens: Doublet air spaced achromatic design Focal Length: 400mm Focal Ratio: F/5 Eyepiece Barrel Diameter: 2-inch (w/ 1.25 inch adapter) Focuser: 2 inch crayford focuser ,single Speed Focuser Millimeter markings on focuser drawtube: Yes 360-degree rotatable: Yes Dust plug: One 1.25" dust plug included Finder scope Bracket: Yes Mount Type: Dovetail Plate Dovetail Plate Length: 100mm Net Weight: 2.48kg / 87.45oz

 In a broad sense, telescopes include not only optical telescopes operating in the visible light band, but also radio, infrared, ultraviolet, X-ray, and even gamma-ray telescopes. We are limited to optical telescopes. In 1609, Galileo produced the first telescope. It has a history of nearly four hundred years. During this period, it has experienced a major leap. According to the type of objective lens, it can be divided into three types: 1. Refracting telescope The objective lens of a refracting telescope is composed of a lens or lens group. The early objective lens was a monolithic structure, with serious chromatic aberration and spherical aberration, which made the celestial bodies viewed with colored spots. In order to reduce chromatic aberration, people desperately increased the focal length of the objective lens. In 1673, J. Hevelius built a 46-meter-long telescope. The entire lens barrel was hoisted on a 30-meter-high mast, requiring multiple people to pull it with a rope. Mo...