Fov calculator telescope

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Forgot your password? By 12dstring August 11, in Discussions - Software. You may have come across a field of view calculator I wrote over 5 years. It's by far the most popular thing I've written, and gets quite a lot of links from various SGL threads. It originally was just a simple calculator, but was expanded to something of a fov simulator.

Fov calculator telescope

There are a lot of terminologies to learn when you start a new hobby and astronomy is no exception. So what is it? Put very simply, the field of view is how much sky you can see, as measured in degrees. Since we only have eyes at the front that look forward, this is impossible. More realistically then, the average human eye, without the help of binoculars or a telescope, has a field of view of about degrees. In other words, we can typically see everything in front of us and a little way to the sides. In astronomy, the field of view usually refers to how much of the sky we can see through either binoculars or the eyepiece of a telescope. You can observe the Moon with two different sets of binoculars that both have a magnification of 10x. If one has a larger field of view than the other, it simply means you can see more of the surrounding sky. The Moon itself will appear exactly the same through both pairs of binoculars. This typically involves starting with a bright star and then hopping across to other stars until you reach your destination. Get the field of view wrong and you could get lost looking for the next star to hop to. There are two other reasons why your field of view is important — and they both come into play once you have your target in your sights.

Written By: Richard J Bartlett. Our Astronomy Experts. Scott Posted August 11,

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The field of view FOV in a telescope defines the extent of the observable universe that is visible through the eyepiece at any given moment. Knowing the FOV allows astronomers to determine the ideal eyepiece for a specific observation. Calculation of the TFOV is done by dividing the AFOV of the eyepiece by the magnification of the telescope, or through the relationship of the focal lengths of the telescope and the eyepiece. The TFOV is typically expressed in degrees. The FOV in the eyepiece is determined by its specific AFOV, and the choice of eyepiece thereby plays a vital role in the observational experience. The relationship between FOV and magnification is inversely proportional, such that an increase in magnification results in a narrower field of view, while a decrease in magnification yields a broader view. The field of view FOV in a telescope refers to the extent of the observable sky that can be viewed at a single point in time.

Fov calculator telescope

Telescopes open our eyes to the marvel of the cosmos: the telescope field of view calculator will tell you exactly how much! Our eyes work pretty okay, but they are absolutely useless when it comes to distant things. It makes sense: we evolved to see predators a hundred meters away, not stars on the other side of the galaxy. That's where telescopes really give us an edge. A telescope is an optical device that collects light , thanks to a well-thought set of lenses, which focuses and magnifies an image on our retina. The difference lies in how they focus the light.

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Dividing 40 by 81 gives me 0. Existing user? Grant Posted July 14, Our Rating Process. I never ignore you Olly, I am grateful for your feedback and admire your work. By using this site, you agree to our Terms of Use. Recommended Posts. We have also included this advice on the calculator page:. Easily understood. They all play a part. If you stand just inches away from a tree, you might only see the bark and a few leaves. This is only my personal preference but I feel it makes most sense to begin with a short-list of cameras that suit your telescope and seeing conditions, then consider other factors. The first number denotes the magnification, while the second indicates the diameter of the objective lens in millimeters.

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We have also included this advice on the calculator page: Pixel-scale the subject of this calculator is arguably the most important factor to consider when choosing a camera for your telescope, but there are others: Sensitivity, dark current, read noise, anti blooming, etc. The field of view is 6. Look forward to having a go with v2, as soon as I can get on the computer Thank you, Mondo Reply. Be nice to see Barlow and Reducer options as well. We don't think pixel-scale is the 'definitive' value but that is what the calculator calculates so the text is there to support it. Garethr Posted December 2, StevieDvd Posted August 11, By using this site, you agree to our Terms of Use. Thanks Dave - I've used the v1 fov calc extensively and found it extremely useful. I wonder sometimes if you, Sara, Per, and anyone else with night after night of clear dark sky, realise how very fortunate you are. Please ignore me entirely but, since I'm in the business of explanations, I'm always interested in ways to attack the problem of making them.