This feature can be manipulated using different combinations of objective and eyepiece lens. Everything in the night sky is so far away that it’s not the actual distances between things that we see, it’s the differences in the angle from our vantage point. Telescope Magnification Formula. You can exceed this magnification depending on your scope, but it starts to point to the value of light gathering versus high power magnification. Now we can determine the magnification we will get with various combinations of eyepieces and the telescope. Type of telescope Magnification of the Telescope Theory Size and Distance in the Sky. For example, a 600mm telescope would provide 60X magnification with a 10mm eyepiece. Let us say that our telescope has a focal length of 1000mm this will make it easier for starting but obviously not all telescopes have the same focal length.I am going to use the eyepieces mentioned earlier for the calculations. The eyepieces we use ultimately determine magnification, but what's surprising is that an effective magnification of 50x is often the most desirable limit for both viewing and light gathering ability with many telescopes. In general, when the magnification of scope increases, the image brightness, and field of view (FOV) decreases. Once you have done that, you divide the field number by the magnification numbers to find out the diameter of your FOV. Power The power of the telescope, computed as focal length of the telescope divided by the focal length of the eyepiece. Now, Eyepieces are reliant on their Focal Length (every eyepiece has one and they are a few millimeters in length – this number is inscribed onto each eyepiece). For that reason we measure distances and sizes in the scope image in terms of angles – degrees and fractions of degrees. High powers are useful for detecting faint stars, use up to 50X or 75X per inch if seeing conditions permit. You can select your eyepiece or binoculars by clicking 'Mode'. To bring up a field of view, select your telescope make and model, then select your camera make and model. Let’s dive deeper into direct formulas. if the calculator shows that a certain eyepiece gives 100x in your telescope, and you add a 2x Barlow, the resulting magnification will be 200x (100 x 2). A Barlow Lens, placed between the eyepiece and the telescope, will increase the Resulting Magnification by the power of the Barlow; i.e. To get started on calculating this, you need to be aware of the magnification of the telescopes lens as well as the field number of the one currently in use. How Does Magnification Work (How Is It Calculated) Now you know what component of a telescope is responsible for magnification, its now helpful to understand how it works. Telescope Aperture The diameter of the objective lens or mirror. Magnification or power of a telescope is its ability to enlarge small objects from far distances. 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