Abstract
Binoculars are generally robust and require very little maintenance if they are properly cared for. The exceptions are some of the budget binoculars that have flooded the market over the last couple of decades, many of which seem to have poorly mounted prisms that are easily knocked out of alignment.
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Notes
- 1.
“Conditional alignment” is a term introduced by the binocular repairman William J Cook. It describes the situation where the optical axes of the binocular tubes are aligned with each other at a particular interpupillary distance (IPD). They are not aligned to the binocular hinge. If the IPD is changed, the optical axes of the tubes will no longer be aligned, i.e., the alignment is conditional upon the IPD remaining unchanged.
Bibliography
Dismantled Porro-prism binocular: http://www.actionoptics.co.uk/disdbin.htm
The Naval Education and Training Program Development Centre, Basic Optics and Optical Instruments, New York, Dover, 1997, ISBN 0-486-2291-8.
Seyfried, J.W., Choosing, Using, & Repairing Binoculars, Ann Arbor, University Optics Inc., 1995, ISBN 0934639019.
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Tonkin, S. (2014). Care and Maintenance of Binoculars. In: Binocular Astronomy. The Patrick Moore Practical Astronomy Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-7467-8_5
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DOI: https://doi.org/10.1007/978-1-4614-7467-8_5
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