It does not have a magnification properly speaking since it
works as a camera, not a visual telescope. The aperture of the
Cassegrain-Schmidt mirror is 2.4 m.
The main camera has 16 MB.
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The HST is a Cassegrain reflector telescope.
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Cassegrain
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This type of telescope is often referred to as a
Schmidt-Cassegrain telescope, and can be short and wide. They have
an eyepiece that extends at a right angle from the body, and have a
disk in the middle of the lens, behind which is the mirror.