Tag Archives: telescope

Will my National Geographic telescope accept 1.25″ filters ?

National Geographic telescopes are readily available from a well known catalogue shop. The problem is that some of their eyepieces are not threaded to accept astronomical 1.25″ filters. This is not a problem if you don,t require additional filters. But … Continue reading

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Kelper Optik H20mm 1.25″ erect image eyepiece review

Decided to give the Kelper Optik H20mm erect image eyepiece a work out. For testing I used a Skywatcher Skyhawk 114 reflector telescope. The targets were street lights and buildings around 5 miles away. Designed more for terrestrial use rather … Continue reading

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What is a refractor telescope

      What is a refractor telescope There are three basic ways to bring light rays to a focal point. The earliest method used by telescope makers, was to bend the rays by passing them through one or more … Continue reading

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How much magnification can I use with my telescope?

 Everyones telescope is different, but a rough rule of thumb is around 30-50X per inch diameter of the main lens/mirror. A good ED refractor may, however, use 100X/inch on bright objects, so this is not a hard rule. You can always increase … Continue reading

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