Craig's Pages




Coverage of common CCDs on various targets as a function of focal length

Just what will you actually be able to fit on that scope and camera? You might be surprised. Many CCD cameras have fairly small chips that make their view of the universe about as big as a 6 mm Plossl gives you. Click on the links below to see examples of approximate coverage of different sized CCDs as a function of scope focal length. Images taken from the Digitized Sky Survey.

Type 1/3" CCDs (~6 mm diagonal)

Type 1/2" CCDs (~8 mm diagonal)

Type 2/3" CCDs (~11 mm diagonal)