Examples of focal ratio in a Sentence
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Key features: Extra-low dispersion (ED) glass, 1.2-inch (30 mm) aperture, 5.9-inch (150 mm), f/5 focal ratio, 3.6 lb (1.65 kg), 2.1MP Sony IMX662 sensor, alt-azimuth go-to mount, operated via app.
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Chris McMullen, Space.com, 2 Dec. 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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Chris McMullen, Space.com, 2 Dec. 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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“Focal ratio.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/focal%20ratio. Accessed 17 Dec. 2025.
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