Vivitar Solid Glass Mirror Lenses
Published by David V. Barth at Smashwords
Copyright 2012 by David V. Barth
Discover other titles by David V. Barth at Smashwords.com
Edition, License Notes
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Table of Contents
Chapter 2: What is the focal length of a lens?
Chapter 3: What is a "normal" lens?
Chapter 4: What is a portrait lens
Chapter 5: What is a telephoto lens?
Chapter 6: How long can telephoto lenses get?
Chapter 7: From 6-foot, plus, telephotos to shorter, mirror lenses
Chapter 8: Mirror lenses are delicate instruments
Chapter 9: Vivitar's 800mm, 5-inch long solid cat lens
Chapter 10: Discover other titles by David V. Barth at Smashwords.com
Chapter 11: About the Author
This is an essay about telephoto mirror lenses that use solid glass instead of thin glass reflectors. The discussion will apply to cameras that are designed to use film that is 35mm in size, digital cameras that have an effective sensor size of 35mm, and cameras that can accommodate interchangeable lenses.
In the early years of digital, between 2000 and 2015, most digital cameras had sensors that were smaller than 35mm simply due to the high cost of producing sensors of that size. By the late 2000s, high-end digital cameras had sensors that approximated 35mm film in size, but they cost upwards of $5,000. By 2015, prices had (or will) come down due to economy of scale as production of 35mm equivalent sensors ramps up, and fewer larger, "professional" cameras use smaller sensors. However, small point-and-shoot cameras and cellular phone cameras will continue to use smaller sensors to allow for compact design.