![]() If you know the width of your imaging chip and focal length of your optic in millimeters, you can compute the field of view yourself:įield of view in arc minutes = (width of chip * 3460) / (focal length of optic) Focal length and sensor size work together to determine the exact area of sky you can image. By the same token, smaller imaging chips restrict the field, while larger sensors provide wider fields of view. Longer focal length instruments shrink the area of sky you see due to the greater magnification shorter focal lengths widen up the area. When you attach a camera to a lens or a telescope, it sees a fixed area of the sky that is determined by the focal length of your lens's optic and the size of your camera's imaging chip. The one from Software Bisque's TheSkyX is shown here. Field of View Most charting programs include a field of view utility. Before I do however, I need to lay some further foundations (see what I did there), so first I’m going to talk about your field of view, and use that to lead into pixel scale. Relating pixel scale to seeing is really more about sampling theory, and I have quite a bit to say about that. I’ve learned my first lesson of writing a monthly blog don’t make promises about next month! So, right after making that rule, I’m going to break it and say next month I’ll do that… again. Last month, we looked at the difference between seeing and transparency in astronomical imaging, and I promised to relate seeing to pixel scale this month. And to determine pixel scale, you first need to know your field of view. Knowing your astrophotography setup's pixel scale will help you take better pictures. ![]()
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