Ready to go beyond the basics? These guides tackle the technical side of amateur astronomy — optics theory, magnification limits, GoTo mounts, and the formulas serious observers use to get the most out of their equipment.
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What Is The 50x Rule For A Telescope? Magnification limits
The 50x rule sets a telescope’s realistic maximum magnification — about 50x per inch of aperture. Here’s what it means…
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Apochromatic vs. Achromatic Telescope Lens, Which is better?
Apochromatic vs achromatic refractor lenses — the real difference in color correction, image quality, and price, and which one is…
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Astronomy Formulas Explained with Sample Equations
Key astronomy and telescope formulas explained with sample equations — magnification, focal ratio, aperture and more, worked through in plain…
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Telescope Filters; Which Ones to Use Where and Why
Telescope filters explained — which ones to use where and why, from Moon and planetary filters to light-pollution and color…
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Are Computerized GoTo Telescopes Worth the Price?
Are computerized GoTo telescopes worth the price? The real pros and cons of automatic object-finding, and who should buy one…
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What Is a Compound Telescope? Pros, Cons & Types Explained
A compound telescope combines lenses and mirrors for a compact, versatile scope. Here’s how it works, the main types (SCT…
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What the “f/ratio” Means in Telescope Lingo
What the f/ratio means in telescope terms — how focal ratio affects brightness, field of view, and whether a scope…