![]() You can see more, and more detail, with a 200 mm telescope. What you need to know about aperture is that there are many things you can see with a 70 mm telescope. A 102 mm aperture telescope would also be called a 4-inch telescope. One inch equals 25.4 mm, so you can do the conversion if you wish. The more light you gather the more detail you can see or the dimmer the object that you can see. This is usually measured in millimeters which we abbreviate as mm. This is the measure of the light gathering ability of the telescope. I just wanted you to know the names and that not all optical tubes are the same.Īperture – The diameter of the lens or mirror of the telescope is the aperture. If there is any distinction about how they are used I will call them out as we go along. The most common are the Schmidt-Cassegrain telescope, SCT, and the Maksutov-Cassegrain telescopes, MCT.Īll four types are very popular. These are called catadioptric telescopes. Some optical tubes have both lenses and mirrors. The optical tube has the lens in the front (refractor) or mirror in the back (reflector or Newtonian) that is used to gather light. Optical Tube – This is the part that most people think of as the telescope. You might want to note which are the pieces that match to your telescope. Because this is a general guide I will touch on things that may not apply to your telescope. I am going to overview the parts of the system so you have a better understanding as you read this guide and other articles on telescopes and astronomy. Parts of a Telescope and their FunctionĪ telescope is a system of parts that work together to present an image to your eye. You will learn what they mean and how to use telescopes to have an awesome celestial observing experience. I will define terms like aperture, focal length, optical tube, mount, focuser, and eyepiece. This first time telescope user’s guide is exactly what you are looking for. You followed the assembly guide and now you want to get the most you can out of your investment.
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