Examples of focal ratio in a Sentence
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Key features: 130mm aperture, 650mm focal length, f/5 focal ratio, Newtonian reflector design, StarSense Explorer app, smartphone holder, manual alt-azimuth mount, accessory tray.
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Harry Bennett, Space.com, 10 Sep. 2025
An eyepiece changes the focal ratio of your telescope, thus changing the magnification.
—Cameron Johnson, Popular Mechanics, 10 Nov. 2020
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Harry Bennett, Space.com, 10 Sep. 2025
An eyepiece changes the focal ratio of your telescope, thus changing the magnification.
—Cameron Johnson, Popular Mechanics, 10 Nov. 2020
Cite this Entry
“Focal ratio.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/focal%20ratio. Accessed 20 Sep. 2025.
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