T-number

noun

: a number that is similar to the f-number but takes into account the amount of light actually transmitted by a lens after loss by absorption and reflection and that equals the f-number divided by the square root of the transmittance

Word History

Etymology

total light transmission + number

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Rhymes for T-number

• cumber
• lumber
• number
• slumber
• umber
• encumber
• outnumber
• renumber