A field of view and framing calculator for astrophotography. Search over 13,000 objects, enter your telescope's focal length and your camera's sensor size, and the frame is drawn on a real survey image of that part of the sky. You can see at a glance whether the whole nebula fits your camera, how much room it leaves, or whether it needs a mosaic.
Turn the frame to the position angle that suits the target and read the pixel scale for your camera. When one frame is not enough, lay out a mosaic of up to 6 by 6 panels on the same image.
With an account, pick a saved rig instead of typing its numbers, keep the frame with your imaging project, and export it as a target list for N.I.N.A. or ASIAIR.
Framing a target needs no account. It runs in your browser on a computer or a phone.