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Ann Ronan Picture Library
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5 results for: focal length
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ARP23A16_215
A refractor with a focal length of120 inches being...
ARP07113_010554P
Observers using a refracting telescope
ARP07104_460001263
Long focal length refracting telescope
ARP07104_460001282
Reflecting telescope of 40 ft
ARP07096_390001535
William Herschel, Telescope
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