Calculating your FOV is essential for ensuring your target fits within your frame. The method differs between visual observing and imaging: 1. Imaging (Sensor-Based) FOV
No accounts, no complicated menus. Enter your scope’s focal length and eyepiece specs. It gives you the TFOV in degrees and arcminutes instantly. astro fov calculator top
Type in the focal length of your telescope or lens. If you are using a focal reducer (e.g., a 0.7x reducer on an SCT) or a Barlow lens (e.g., 2x), ensure you enter that multiplier. The calculator will automatically compute your effective focal length . Step 2: Input Your Camera Data Calculating your FOV is essential for ensuring your
To understand what the calculator is doing, you can use these formulas: Enter your scope’s focal length and eyepiece specs
$$FOV = 57.3 \times \frac\textSensor diagonal (mm)\textFocal length (mm)$$
): Images look soft because atmospheric turbulence limits detail. Common in long focal length Schmidt-Cassegrains. Aim for for typical atmospheric conditions. Sensor Crop and Vignetting