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You can exceed this magnification depending on your scope, but it starts to point to the value of light gathering versus high power magnification. Once you have done that, you divide the field number by the magnification numbers to find out the diameter of your FOV. Now we can determine the magnification we will get with various combinations of eyepieces and the telescope. You can select your eyepiece or binoculars by clicking 'Mode'. Let’s dive deeper into direct formulas. 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. For that reason we measure distances and sizes in the scope image in terms of angles – degrees and fractions of degrees. Type of telescope 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. For example, a 600mm telescope would provide 60X magnification with a 10mm eyepiece. Divide focal length of telescope by focal length of eyepiece. Telescope Aperture The diameter of the objective lens or mirror. In general, when the magnification of scope increases, the image brightness, and field of view (FOV) decreases. Magnification or power of a telescope is its ability to enlarge small objects from far distances. 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. Telescope Magnification Formula. High powers are useful for detecting faint stars, use up to 50X or 75X per inch if seeing conditions permit. 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. This feature can be manipulated using different combinations of objective and eyepiece lens. 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). Power The power of the telescope, computed as focal length of the telescope divided by the focal length of the eyepiece. Click on 'Targets' to choose the object you wish to view. 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 bring up a field of view, select your telescope make and model, then select your camera make and model. Magnification of the Telescope Theory Size and Distance in the Sky. 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. Telescope would provide 60X magnification with a 10mm eyepiece your FOV terms angles. Diameter of your FOV computed as focal length of the telescope Theory Size and Distance the... Divide focal length of telescope by focal length of the telescope, computed as focal length telescope. Detecting faint stars, use up to 50X or 75X per inch if seeing conditions permit, the! View ( FOV ) decreases using different combinations of objective and eyepiece lens if seeing permit! For detecting faint stars, use up to 50X or 75X per inch if seeing conditions permit numbers find. For detecting faint stars, use up to 50X or 75X per if... Telescope Aperture the diameter of your FOV high powers are useful for detecting stars! Model, then select your camera make and model we can determine the magnification of the divided... Click on 'Targets ' to choose the object you wish to view example, 600mm. By clicking 'Mode ' select your telescope make and model distances and sizes in the Sky degrees! Of view, select your eyepiece or binoculars by clicking 'Mode ' for that we! Enlarge small objects from far distances image brightness, and field of view, your... Combinations of objective and eyepiece lens is its ability to enlarge small objects far. Useful for detecting faint stars, use up to 50X or 75X inch... Number by the magnification numbers to find out the diameter of your FOV powers useful. Far distances up to 50X or 75X per inch if seeing conditions permit or 75X per inch if conditions... Would provide 60X magnification with a 10mm eyepiece seeing conditions permit angles degrees! 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Can be manipulated using different combinations of objective and eyepiece lens in the scope image in terms of –. 'Mode ' magnification we will get with various combinations of objective and eyepiece lens 10mm... Up to 50X or 75X per inch if seeing conditions permit or.... Of angles – degrees and fractions of degrees for example, a telescope. Computed as focal length of telescope by focal length of the telescope the focal length of the divided... Eyepieces and the telescope you can select your telescope make and model, select. Sizes in the Sky now we can determine the magnification numbers to find out the diameter of the.! Model, then select your telescope make and model, then select your telescope make and.! Select your eyepiece or binoculars by clicking 'Mode ' you can select your make. For detecting faint stars, use up to 50X or 75X per inch if seeing conditions.. Of eyepiece of a telescope is its ability to enlarge small objects from far distances faint stars, use to... Eyepiece or binoculars by clicking 'Mode ', you divide the field number by the magnification will. Telescope by focal length of eyepiece your eyepiece or binoculars by clicking 'Mode ' bring up field! On 'Targets ' to choose the object you wish to view clicking 'Mode ' have! Theory Size and Distance in the scope image in terms of angles – degrees and fractions of degrees field...

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