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In theory, at least, an astrograph is a telescope with the sole purpose of astrophotography, typically including wide, distortion-free fields of view for astrometry (i.e. position-finding)

The term's been rather diluted to mean a telescope that's well-suited to imaging

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There are a number of designs quicker than f/2.8 - I think Mersenne-Schmidts are around f/1.25 and the Baker-Nunn design is f/0.75, classical Schmidt cameras are faster than f/2

The LSST is a Mersenne-Schmidt design, with an 8m mirror giving a 3.5-degree field of viwe

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