These spreadsheets can be used to calculate numerous useful parameters for astrophotographers and help visual. It should be realized though that there are other factors which affect our perception of the object brightness: Contrast does increase with magnification (due to a lower background), object size also increases, so is the overall apparent magnitude. Astrophotography and Eyepiece Calculators. A mathematical proof to this is included in attached Excel file, though it can simply be backed by "Radiance Conservation Law" or "Extent Conservation Law" which is derived from the conservation of energy law. If we take a telescope and use magnification which gives us brightest possible image (exit pupil equals to dark adapted eye's pupil of 6-7mm) there will be no change in apparent surface brightness of the object compared to unaided eye. Enter in the air temperature ( T air ) and dew point temperature ( T dp) in degrees Fahrenheit ( o F ) then click on the Calculate RH to compute the relative humidity ( RH ) T air. and their movements had long helped in the calculation of time, the prediction of weather and river floodings, and navigation across trackless deserts. ![]() Irradiance if we use radiometric therminology, or as we may simply call it, apparent surface brightness. Go to the desired page on the site, open the Weather shortcuts menu and click on the 'Add to shortcuts' button Page name will display in the 'Add this page' window, the name can be changed by highlighting the text and entering the desired name. Vignetting and field of view, coma, focal depth, thermal shift of focus. Deep Sky section with sampling rate based on seeing, required barlow, etc. Planetary section with sampling rate, required barlow, video times for planets. Basic parameters such as FOV, resolution, airy disk, image scale, etc. There is a certain amount of light density (per square metre) reaching our eye's retina. Astrophotography and CCD Calculator Features. Depending on your browser configuration, you will be able to view the PDF pages in the browser window or enter directly into a download dialogue. If not, you can click here to download the free Adobe Acrobat Reader. One of the purposes of this calculator is to bring attention to a topic often unfamiliar to amateur astronomers: The fact that apparent surface brightness (intensity per area of our retina as we see it) of an extended deep sky object is constant - it never actually increases, no matter which telescope we use. In order to view the additional tables for this chart, you need a PDF viewer, which is already installed on most devices. ![]() ![]() Previous telescope calculator screenshot Note About Surface Brightness
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