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physical object > artifact > device > instrument > telescope > electromagnetic telescope > Earth based telescope > altazimuth telescope > Keck
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Keck comparison table
Subject has focal ratio has creation date
Keck If/1.75, 15, 25 IR1991
Keck IIf/1.751996

Next altazimuth telescope: Large Binocular Telescope    Up: altazimuth telescope, optical telescope, Ritchey-Chrétien, segmented mirror telescope    Previous altazimuth telescope: Hobby-Eberly Telescope