refractor telescopes manufacturers

Finder Scope Bracket   Suitable for telescope like refractor, reflector or SCT. Screw lock base is easy to use. High strength aluminum with anodizing . Specification: Material: Aluminum alloy  Package List: 1 * Mounting Bracket    

2" Dark Frame Filter The 2" Astronomic Dark Filter is essential for a CCD camera that doesn't have a mechanical shutter. This filter allows you to take dark frames without the hassle of monitoring your set up. The filter is opaque and threaded in a 2" cell. This filter works even better with a filter wheel. Attach this filter to a filter wheel in order to take a dark frame without capping off your telescope. The Astronomic Dark Frame filter is a must-have for many cameras that don't have a mechanical shutter, including interline CCD cameras from Starlight Xpress, Imaging Source, Atik, as well as others.

120mm Tube Ring+160mm length Dovetail 120mm tube rings and 160mm length dovetail,vixen-style the length of dovetail bar :160mm diameter:120mm

Flip Caps with glass The 32mm,44mm,45mm,50mm,53mm,59mm measurement means the inside diameter of the cover，the cover materials is glass.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.

  Off-Axis Guider for Astrophotography Delightfully thin off-axis guider ideal for use with Newtonian reflector telescopes and DSLR cameras Lets you guide and capture astrophotos simultaneously through one telescope. No guide scope required! 10.5mm thickness perfect for use with Newtonian reflectors which have limited back focus travel Will not interfere with the use of coma correctors thanks to its thin profile Compensates for any existing flexures that may interfere with accurate guiding and tracking

 Guide Star Dovetail Mounting Plate + Tube Rings for Telescope Short Type • Provides a platform for coupling telescope optical tubes to Atlas equatorial (EQ) telescope mounts. • Attach telescope tube rings to the dovetail mounting plate for easy, no-tools attachment of the telescope to an EQ mount. • 3.81 inch Length plate is especially useful for short focal length refractor telescopes. • Made of anodized aluminum. • Includes 1x dovetail mounting plate, 2x screws.  

1.25" T Adapter for Telescope 1.25" Camera Photography Telescope Eyepiece Holder Adapter 31.7mm-1.25" to T T2 / 1.25 Inch M42 DSLR/SLR Prime Adapter for Telescope Standard 1.25" Prime Focus T-adapter fits on any telescope that uses a 1.25" eyepiece focuser for prime focus photography. Male T thread specification is M42x0.75 To use, insert the 1.25" barrel into your diagonal or telescope, attach your D/SLR camera to the male T-thread (via a T-ring that is specific to your camera; not included), and you are ready to take photos as prime focus with your telescope or spotting scope.  

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...