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Find out the field of view, star chart, cloud forecast, lookup coordinates and more for any location and date. astronomy.tools is a collection of useful, free astronomy tools for amateur and professional astronomers.
- Field of View
Field of View Calculator. As you add equipment to the view,...
- Calculators
Calculators - astronomy.tools
- Star Chart
Star Chart - astronomy.tools
- Lookup Coordinates
Lookup Coordinates - astronomy.tools
- FAQ
FAQ - astronomy.tools
- Links
Links - astronomy.tools
- Get In Touch
Get In Touch - astronomy.tools
- Magnification
Notes: 1: Atmospheric seeing conditions (the sky) often...
- Field of View
Calculate the field of view of different telescope, camera and eyepiece combinations for visual, imaging and binocular modes. Choose from a database of equipment or add your own, and see star charts and images of objects.
- The Challenge
- The Theory
- The Solution
- Making It Easy
For a star to retain it's round shape when viewed on your screen or photograph it’s diameter must cover a sufficient number of pixels. Too few and the image will be 'under-sampled’, the stars will appear blocky and angular'. For a smoother more natural look more pixels are required, but not too many because if you use more pixels than are necessary...
In the 1920s Harold Nyquist developed a theorem for digital sampling of analog signals. Nyquist’s formula suggests the sampling rate should be double the frequency of the analog signal. So, if OK seeing is between 2-4” FWHM then the sampling rate, according to Nyquist, should be 1-2”. There is some debate around using this for modern CCD sensors be...
It is better then to image with a resolution 1/3 of the analog signal, doing this will ensure a star will always fall on multiple pixels so remain circular. Our calculator, at typical seeing of 2-4”, uses the Nyquist formula of 1/2 and the 1/3 to stop stars becoming square so the optimal range is between 0.67” and 2”. (0.67 = 2 / 3, 2 = 4 / 2). In ...
When using our calculator you you don’t need to understand the theory or the maths. Simply enter the telescope's focal length, the camera's pixel size and your sky's seeing conditions to determine if they are a good match :-) A few notes: 1. We are assuming OK seeing is between 2-4” FWHM and a resolution between 0.67” and 2” per pixel is the sweet ...
Stellarium is a free open source software that simulates the night sky in 3D. You can explore the stars, planets, constellations, and more with realistic graphics, time control, and telescope simulation.
23 de jun. de 2005 · You'll love this vast collection of astronomy software that includes free or inexpensive computer programs to aid your observing and exploring of the sky.
There’s a wealth of free astronomy software available online to enhance your observations of the night sky. Here are some of the best.
Find out what's happening in the night sky, learn how to observe and photograph celestial objects, and join the astronomy community. Explore the latest news, events, podcasts, and guides from Sky & Telescope magazine.
