Caption: A blank field of view (FOV) diagram.

Click on the FOV and then to print, go file/printpreview/adjust/print to get a printout.

Credit/Permission: © David Jeffery, 2015 / Own work.
Image link: Itself.
Local file: local link: field_of_view_blank.html.
File: Telescope file: field_of_view_blank.html.