Author
Sasián, J.Affiliation
Wyant College of Optical Sciences, University of ArizonaIssue Date
2023-03-19
Metadata
Show full item recordPublisher
SPIECitation
José M. Sasián "Simple and accurate method for determining lens focal length," Optical Engineering 62(3), 034108 (19 March 2023). https://doi.org/10.1117/1.OE.62.3.034108Journal
Optical EngineeringRights
© 2023 Society of Photo-Optical Instrumentation Engineers (SPIE).Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
A simple and accurate method for determining the focal length of a lens is presented. There is no need to know the distance between lens principal planes and can be performed with easily available and inexpensive hardware. Depending on the test lens (TL) f-number, the error on determining focal length can be in the order of 0.1% of the focal length. We discuss determining focal length with the Newton equation f2 = zz ′ , with the Bessel equation f = ((L - PP)2 - D2) / 4 (L - PP), with equation f2 = y ′ (y + y ′ ), or with equation f = (y2 - PP2) / 4PP. © 2023 Society of Photo-Optical Instrumentation Engineers (SPIE).Note
Immediate accessISSN
0091-3286Version
Final Published Versionae974a485f413a2113503eed53cd6c53
10.1117/1.OE.62.3.034108