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Focal Length Calculator. Calculate the focal length of your telescope. Formula: Aperture X Focal Ratio. Aperture: mm. X Focal Ratio: f/. = Focal Length: mm.
Each magnification corresponds to an eyepiece focal length, which the simulator calculates for you. The obtained focal length values are rounded to values corresponding to what is usually found on the market.
You don't need to use the calculation feature - just scroll down the output table to find the formula you need. All variables used are always defined in rows nearer the top of the table. If you have measured a Sagitta (depth of Curve) and want to calculate Focal Length, use our Sagitta to Focal Length Calculator .
Please select one of 458 telescopes from the drop-down box, or use Manual mode to enter the aperture and focal length by hand.
Afocal Projection. Barlow Projection. Maximum Exposure Length for Planetary Rotation. Calculator Instructions. Calculators already have sample data in them. Some are examples from my telescope, a C11 SCT with 279.4 mm of aperture and 2,794 mm focal length at f/10.
31 maj 2024 · Use this telescope magnification calculator to estimate the magnification, resolution, brightness, and other properties of the images taken by your scope.
The Calculator will use the first two parameters it finds in the boxes below and calculate the third. Focal Length & Aperture: Do not use symbols to group digits together. (Good: 2032. Bad: 2, 032 or .) Focal Ratio (f/#): Use either one comma "," or one period "."
