To define magnification, we would say it is the distance between the eyepiece and lens. At this point it’s worth pointing that you’re Focal Length of the eyepiece gets smaller for more magnification. If you want to do more reading on “point spread function” Wikipedia has a great resource explaining it all. To work out the telescope magnification, you need the Focal Length of the telescope and Focal Length of the eyepiece. Telescope Magnification Calculator. If there is turbulence in the atmosphere, also known as astronomical seeing can give a very unstable view, even more, if you are using high magnification. You then divide the focal length of the telescope by the focal length of the eyepiece; this gives you the telescope magnification. When this number is less than one, it refers to a reduction in size, sometimes called "minification" or "de-magnification". The results will not be great; in short the image thought the eyepiece will become distorted and fuzzy also known as “point spread function”. Focal Length of the telescope 1325mmFocal Length of Eyepiece 5.5mm. If you continue to use this site we will assume that you are happy with it. A Barlow Lens, placed between the eyepiece and the telescope, will increase the Resulting Magnification by the power of the Barlow; i.e. backyardstargazers.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon. Power The power of the telescope, computed as focal length of the telescope divided by the focal length of the eyepiece. 2: An exit pupil size (diameter of light beam as it exits eyepiece) over 7.5mm might be too large for telescope designs with central obstructions (i.e. Notes: 1: Atmospheric seeing conditions (the sky) often limits the maximum usable magnification to 250-350x. Enter the scope's primary mirror size. Enter the eyepiece size in millimeters; also enter the lens' focal ratio. So as you can see it’s an easy calculation but there is a little more to it and its best shown with a real working example. If you are viewing a star cluster in the eyepiece, for instance, it can look much better at lower magnification. I wish you clear skies and an enjoyable stargazing experience on your next trip out. It’s easy to think that higher magnification will give you a better view as long as you stay within the highest useful magnification. Bigger is not always better, and I have had some of my brightest and sharpest views with low magnification. Celestron nexstar 4se computerized telescope, Focal Length of the telescope 1325mmFocal Length of Eyepiece (included eyepiece) 25mm. So, avoid the disappointment and calculate the correct eyepiece and have much more fun. Optical magnification is sometimes referred to as "power" (for example "10Ã— power"), although this can lead to confusion with optical power. The eyepiece’s focal length (for example, 25mm) To find the magnification, we’ll simply divide the numbers: 1200mm / 25mm = 48x magnification That’s it! If you are new to astronomy, you may not know how to calculate this. High powers are useful for detecting faint stars, use up to 50X or 75X per inch if seeing conditions permit. We need to find the highest useful magnification; this is easily found on the manufactories site. This is something that drips up a lot of new people into astronomy so the smaller the mm with eyepiece the more the magnification. Telescope Aperture The diameter of the objective lens or mirror. One question we often ask is, what is the magnification of your telescope? Let’s get back to our example we know we have a 241x Highest useful magnification. So, now we know that in our example, the Celestron Nexstar 4SE comes with 53x Magnification. Newtonian telescopes). However, this is not always the case, as other factors can affect your views of the night sky. Over our 241x highest useful magnification so we need to come up a little lets go with a 5.5mm eyepiece. Again it’s worth pointing out that there is a lowest useful magnification, it’s a similar process but one for another post this post is all about the power. 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). Let’s keep on using the Nextsar 4se as our example. It’s equal to the telescope’s focal length divided by the eyepiece’s focal length. This is on the edge of the highest useful magnification so we know that the smallest eyepiece with the Celestron nexstar 4se (our example) is a 5.5mm eyepiece. This calculator is designed to give the magnification characteristics for a given telescope, based on the data entered for the scope's operating specifications. For example a 25mm eyepiece on a 1500mm focal-length telescope would yield a power rating of 75x (1500/25 = 60) While a using a 10mm eyepiece on the same telescope would give 150x (1500/10 = 150). The short answer would be that it is the power of your telescope. However, let’s say we want to up our magnification and push the power of our telescope. Focal Length of the telescope 1325mmFocal Length of Eyepiece 5mm. Magnification is the process of enlarging something only in appearance, not in physical size. What this does is steady’s the view in your eyepiece, and I would only move up the magnification when turbulence in the atmosphere improves. When adding an eyepiece or binocular, please don't include the magnification or aperture details in the model, this will get added automatically. To work out the telescope magnification, you need the Focal Length of the telescope and Focal Length of the eyepiece. If there is lots of turbulence in the atmosphere, you would be better off going with a smaller magnification. This enlargement is quantified by a calculated number also called "magnification". Magnification (power): The amount that a telescope enlarges its subject. Field of View Calculator Test different telescope, camera & eyepiece combinations. Optical magnification is the ratio between the apparent size of an object (or its size in an image) and its true size, and thus it is a dimensionless number. You then divide the focal length of the telescope by the focal length of the eyepiece; this gives you the telescope magnification. Click on Calculate for the scope's magnification … Type of telescope If we wanted more magnification, we could use an eyepiece with a shorter focal length, such as 10mm: 1200mm/10mm = 120x magnification We could also use these eyepieces with a … Right we can take a big jump as we know we have a lot of space to work with let’s go with a 5mm eyepiece and apply our calculation. To get started, we just need two numbers: 1. https://en.wikipedia.org/wiki/Magnification, href='https://www.azcalculator.com/sitemap.xml'>Sitemap. Can Everyone on Earth See the Moon at the Same Time. I hope this post shows you how to calculate telescope magnification but goes behind that by giving you some food for thought when you come to buy a new eyepiece. With higher magnification, the view can look cropped in the eyepiece and much less detail leading to disappointment. You can apply this example with your own telescope. While we understand why focal length matters and how to compensat… As a rule of thumb, a telescope’s maximum useful magnification is 50 times its aperture in inches (or twice its aperture in millimeters). Thus, by calculating the magnification, you can come to a conclusion about how truly reliable your telescope is. Optical magnification is the ratio between the apparent size of an object (or its size in an image) and its true size, and thus it is a dimensionless number. We use cookies to ensure that we give you the best experience on our website. The telescope’s focal length (for example, 1200mm) 2. Optical magnification is sometimes referred to as "power" (for example "10Ã— power"), although this can lead to confusion with optical power. Experiment with different eyepieces but don’t exceed the highest useful magnification; you will just be wasting your money. Celestron NexStar 4SE Computerized Telescope Review, Celestron NexStar 8SE Computerized Telescope Review. Don’t panic; it’s a straightforward calculation and an important calculation to understand as each telescope has the Lowest Useful Magnification and the Highest Useful Magnification. Before we give you the formula on how to accurately calculate this, we need to discuss the focal length.

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