Scratch / Dig Specifications

Scratch / Dig Specifications

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Purpose: This document defines glass surface quality on optical components per MIL-O-13830. Definitions: SCRATCH: Any marking or tearing of the glass surface. SLEEK SCRATCH: A hairline scratch. CRUSH or RUB SCRATCH: A surface scratch or a series of small scratches. DIG: A small rough spot on the glass surface similar to pits in appearance. A bubble is considered a dig. Procedure: Surface quality i... Read More »

How to Choose a Telescope

How to Choose a Telescope

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Like choosing neighborhoods, automobiles, or spouses, buying a first telescope is a highly subjective undertaking. There’s no “best” telescope for everyone. The one that’s right for you will depend on your lifestyle and your astronomy goals. Spending a little time analyzing your motivations will help you make an intelligent choice. Let’s look at the different types of telesco... Read More »

Optical Lens

Optical Lens

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In optics, refraction occurs when light waves crosses a boundary between two optical media with different refractive indexes. At the boundary, the wave’s phase velocity is altered, it changes direction, and its wavelength increases or decreases but its frequency remains constant. For example, a light ray will refract as it enters and leaves glass; understanding of this concept led to the inv... Read More »

Guideline

Guideline

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Given the bewildering array of telescopes on the market, how does an enthusiastic but inexperienced consumer choose the right one? To answer this question I will explain the differences between specific telescope(Apochromatic Refractor) types, but for that discussion to be meaningful it is important first to understand some very basic points about astronomical telescopes in general. Aperture is th... Read More »

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