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.

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Guide Star Dovetail Mounting Plate

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.

Off-Axis Guider for Astrophotography

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

Classification and working principle of telescope

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...

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