Category » Technical Discussions

Lenses and Optics

Notes on Lens and Camera Variation

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A funny thing happened when I opened Lensrentals and started getting 6 or 10 copies of each lens: I found out they weren’t all the same. Not quite. And each of those copies behaved a bit different on different cameras. I wrote a couple of articles about this: This Lens is Soft and Other Myths […]

History of Photography

Lens Genealogy – Part 2

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For those who missed all the excitement, in Part 1 of this series I discussed that almost all modern SLR lenses derive from one of 6 types of lenses that were basically in use by the 1920s. Part 1 covered the first three lenses: the Symmetrical, Double Gauss, and Petzval lenses. Those three lenses give […]

History of Photography

Lens Genealogy Part 1

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In which I begin to answer the question “Why Do You Put the Lens Diagrams on Your Website?” Where do new lens designs come from? I knew that today’s lenses are all designed using computer programs, but  I was surprised to find new lenses aren’t designed from scratch. Designers start with an existing lens design […]

Lenses and Optics

The Apocalypse of Lens Dust

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Apocalypse (from the Greek apokálypsis; “lifting of the veil” or “revelation”): An event involving destruction or damage on an awesome or catastrophic scale. A disclosure of something hidden from the majority of mankind. How appropriate the word apocalypse is for this little article. At least once a week I see a post somewhere from a fairly inexperienced […]

Lenses and Optics

Photo Lenses for Video: There is no Free Lunch.

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SLR video cameras and the newer large sensor video camcorders, are often used with photography lenses — which provide outstanding optics at amazing cost savings compared to lenses specifically designed for film/video. A superb photography lens may cost $2,000; about 1/10 of what a good cinema lens or servo zoom ENG style lens costs. However, […]

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