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A Short Guide to Choosing Eyepieces by Neil Paterson PDF Print E-mail

The following is a basic guide to some of the factors to take into consideration when choosing eyepieces. It is based on my experience but also on conversations with and articles by other observers much more qualified then myself.

The choice of which eyepieces to purchase is almost as important as which telescope and mount to choose,

Choosing a telescope By Andrew Johnston PDF Print E-mail

There are three types of telescopes for the Amateur Astronomer, refractor, reflector and catadioptric. All these designs have the same purpose, to collect light and bring it to a point of focus so it can be magnified and examined with an eyepiece, but each design does it differently. All designs can perform satisfactorily if properly and responsibly manufactured and all have their own special virtues.

Choosing a particular telescope depends on your individual needs including cost,

Astronomy Formulae by Andrew Johnston PDF Print E-mail


Here is a set of formulae and numbers that I have always wished was in one place.  Now they are.  Enjoy.

f ratio (or focal ratio) = primary mirror focal length / primary mirror diameter

  • This number tells you how "fast" or "slow" the telescope is.
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