Examples of focal ratio in a Sentence
Recent Examples on the Web
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.
—
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
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
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
Cite this Entry
“Focal ratio.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/focal%20ratio. Accessed 27 Jun. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
