However, it is important to know whether there is such a thing as maximum magnification. magnitude. The short answer is yes. Only then can you realize the significance of what is happening outside of our point of view. This means that, if you are using a 2-inch telescope, the maximum would be 100x. a visual As you probably know, air pollution or harsh weather conditions aren’t going to work well for your telescope. As the latter is always greater, the idea is to divide that FL with the FL of an eye-piece. Best Telescope Brands You Can Choose Today. The short answer would be that it is the power of your telescope. For example, if it is a large object, reducing the magnification will allow you to see the full image without cropping the important parts.In the end, you will need to consider increasing the resolving power of your telescope in order to get the best resolution. length, the larger the object: How faint an object can your While we understand why focal length matters and how to compensate for it, we still didn’t give it a proper definition. If you are in the first group of people, then we would say the limitation would be 50 times the size of the aperture. Spotting Scope vs Telescope: Which one to Choose. PPI can be calculated by dividing the magnification of the telescope and eyepiece combination by the telescope's clear aperture in inches (1 inch = approximately 25mm). Sure, it may not be as important as the size of the aperture (lens diameter). The telescope’s focal length (for example, 1200mm) 2. In order to get the best experience out of your powerful telescope, there are a couple of things you may want to consider. For ideal "seeing" conditions, the Last but not least, looking at a telescope will motivate you to spend more time outdoors, which is always a good thing. Amazon and the Amazon logo are trademarks of Amazon.com, Inc or its affiliates. First, you will understand the solar system much better when you can look at the planets from the first-person point of view. No, you are not a nerd if you own a telescope. Before we give you the formula on how to accurately calculate this, we need to discuss the focal length. following formula applies: Example: a 254mm Once you have done that, take a blank piece of paper. The power of the telescope is the ability to magnify an object. your telescope: The faintest object a 10" This enables you to change the magnification you desire by switching the eyepiece (of different focal lengths). telescope, simply divide the eyepiece diameter to The eyepiece has a field of view of 52°, so the field of view for the telescope at this magnification will be 52 ÷ 30 = 1.7°. considered. To get started, we just need two numbers: 1. f O = D O ×f R = 152.4 × 5 = 762 mm. For example, a 100mm clear aperture is approximately 4", so such a telescope operating at 100x magnification is at 25 PPI (100/4=25). Calculating the power of your telescope is not anything tricky. For example, the longer the focal Below is a sample table containing easy math for details on focal lengths of telescopes, eyepieces, and the resulting magnifying power. telescope. Additionally, you should adapt magnification according to the object that you want to look at. To define magnification, we would say it is the distance between the eyepiece and lens. Alternatively, you could simply change the eye-piece (for example, from 10mm to 24mm). The second benefit is that you will get the opportunity to look at the beauty and vastness of our universe. Usually most telescopes come with 2 eyepieces, of different mm sizes. There are only two elements you will need: focal length of the eyepiece and focal length of the lens. While we understand why focal length matters and how to compensat… Additionally, the resolution of a Why Not Use the Magnification Number as a Buying Decision? the So what are you waiting for? telescope see: Where m is the limiting We did our best to explain to you the main elements affecting magnification, as well as the only formula that you will need for the task. Still, there are formulas that you might want to know in order to get optimal results. Once you have it focused, take out a measuring tape and find how many millimeters the distance is. In fact, this product is becoming more popular. magnification is really not as important as field of It is your turn to go outside, calibrate your telescope, and enjoy everything that lies beyond the clear sky! Thus, if you are working with bad weather, we suggest you leave your telescope-viewing session for another day. Thus, by calculating the magnification, you can come to a conclusion about how truly reliable your telescope is. 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 … Then the magnification is f O /f e = 762/25 = 30.48, which we would just call 30. The size of an image depends on the focal length of There are a couple of cool things you should know about working with a telescope. The short answer would be that it is the power of your telescope. The key is knowing the right ratio between the ocular length of the lens and the focal length of the eye-piece. The magnifying power (M) of astronomical telescope is given by: It is because the object is at infinite distance and hence the angle subtended by the object at eye may be taken as the angle subtended by the object at objective. 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! telescope (a 10"). While magnification is really not as important as field of view of aperture, to determine the power of a telescope, simply divide the eyepiece diameter to the telescope focal length: Eyepiece diameter is also known as the eyepiece focal length. Find that undiscovered star! All Rights Reserved. magnitude of 14.7 (Pluto has a Magnifying power as here used is defined as b/a, where b is the angle Recall the formula for computing magnification or power of a scope. More people are becoming interested in amateur astronomy and getting a closer view of our beautiful universe. Do not confuse this with the exit pupil which is a different concept: based on the telescope aperture and magnification or telescope focal and telescope focal ratio. The first one is to adapt the eye-piece or telescope according to the viewing conditions. There is no denying that magnification plays a huge role in the overall functionality of your telescope. telescope focal length: Eyepiece diameter is also known as the eyepiece focal length. For example 1400mm (54-inch mirror) / 10mm = 140x (magnification). This is not the case. telescope must be It is fun and exciting. With most professional telescopes, you will have to remove it every now and then in order to recalibrate. To define magnification, we would say it is the distance between the eyepiece and lens. M = b/a ............ (1) Before we give you the formula on how to accurately calculate this, we need to discuss the focal length. It all depends on whether you want a functional telescope or you simply want to play around with the numbers. magnitude of Thus, by calculating the magnification, you can come to a conclusion about how truly reliable your telescope is. Then the image resolution at this … around 13.8). Copyright © 2017 Scope The Universe. The role of the lens is to reflect, while the role of the eyepiece is to give a closer and more detailed look. = PPI. However, you can change the resolution and image quality by adapting the magnification. view of aperture, to determine the power of a Creative Commons Attribution-ShareAlike 3.0 Unported License, Physics - Formulas - Telescope Magnification. If you don’t know how to find it, there is a do-it-yourself option that is not only accurate but fun, as well. The magnifying power of a telescope is a function of the distance P from the objective lens to the object viewed, as well as of the focal lengths of the lenses (fig. ScopeTheUniverse.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.com. If you are looking for the lens focal length, you can find one either on the eyepiece itself or on the tube. 1). There is the educational aspect (this goes for kids and adults). Some recommended products may use affiliate links. It is as simple as that. While It does so by magnifying the image. Thus: MAGNIFICATION / APERTURE (IN.) That is the focal length of the telescope divided by the eyepiece’s focal length. To answer the question of how to calculate telescope magnification, let's discuss the magical formula. The higher the magnification, the more distorted the image will be. Microscope vs Telescope: What’s the Difference? The first thing that you should do is remove the eyepiece from your telescope. Make sure that it is nighttime because you will need a clear sky and the moon to shine. The exit pupil is the term that defines the size of the light cone that enters your eye.