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averages about 40 arcseconds in equatorial diameter—so that it spans half the image width, you need a field of view of about 80 arcseconds (1.33 minutes of arc). Substitute these values into the equation and find that you need a focal length of 16,500 mm. With a 10-inch (250mm) telescope, eyepiece projection to a focal ratio of//66 gives the desired image size. This calculation only takes the size of the image into account, and not the ability of the telescope to show detail—that is covered in the next section.

Table 4.3 Typical Astronomical CCD Camera Specifications (Cont.)

Camera

Cols

Rows

Pixel Size

Gain

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