By Stephen F Tonkin
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Extra resources for Binocular astronomy
Dark vegetation on the horizon is ideal. Be aware that you will almost certainly need a bit more “beyond inﬁnity”travel at night time than you need during the day, so allow for this. • Internal Reﬂections. Internal reﬂections, be they reﬂections off the interior walls or components of the binoculars, or “ghost” reﬂections off poorly designed or inadequately coated optical components, are both distracting and detrimental to astronomical observation. ). To test for this, use a bright light source (not the Sun), such as a recessed halogen lamp in the store ceiling or a Mini-Maglite® with the lens assembly removed, slightly off axis.
Field curvature, which manifests as the inability to focus the periphery of the image at the same time as the center is focused, is particularly noticeable when it is present in wideﬁeld binoculars. It can be corrected in the design of the lenses. In particular, if a negative lens can be placed close to the image plane, it will ﬂatten the ﬁeld. 23. Astigmatism. 24. Field curvature. 25. Distortion. linearly with an increase in aperture and as a direct square (quadratic) function of an increase in ﬁeld angle.
And Tadic-Galeb, B. Optical System Design. New York: McGraw-Hill, 2000. Kunming Optical Instrument Co. Ltd. com/. Lombry, T. htm. The Naval Education and Training Program Development Centre. Basic Optics and Optical Instruments. New York: Dover, 1997. S. Introduction to Optics. Englewood Cliffs: Prentice-Hall, 1993. Tonkin, Stephen F. AstroFAQs. London: Springer-Verlag, 2000. Notes 1. Yoder, Paul R. Mounting Optics in Optical Instruments. Bellingham: SPIE, 2002. 2. There are different conventions for the use of “convergence” (and “divergence”), depending on whether the optical axes of the binocular are converging or the optical axes of the eyes are converging (to accommodate the diverging optical axes of the binocular).
Binocular astronomy by Stephen F Tonkin