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![]() ![]() is here to make the search simpler for you. ![]() Magnification: Relationship between the telescope's optical system and the eyepiece.įor the uninitiated, choosing a beginners' telescope can be a confusing affair - especially when you're bombarded with jargon. Small focal ratios provide lower magnifications, wide field of view and a brighter image. ![]() Short focal lengths offer a wide field of view and a small image.įocal ratio: Also known as the telescope's speed. Aperture: Diameter of the primary mirror or lens, which allows a telescope to collect light.įield of view: Area of sky visible through the eyepiece.įocal length: A telescope's tube length. ![]()
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