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Author » Roger Cicala

I'm Roger and I am the founder of Lensrentals.com. Hailed as one of the optic nerds here, I enjoy shooting collimated light through 30X microscope objectives in my spare time. When I do take real pictures I like using something different: a Medium format, or Pentax K1, or a Sony RX1R.

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Selecting the Proper Brick Wall for Photographic Tests

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Many amateurs test their lenses by taking pictures of the nearest brick wall without logically thinking about what information that particular wall provides. Done properly, a brick wall test can provide a superb evaluation of your lens. But a poorly done brick wall test is really no better than taking cat pictures without first measuring whisker length and diameter. […]

Lenses and Optics

Sony FE 20mm f/1.8 G Optical Tests

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I haven’t published much optical testing in the last year for many reasons; some obvious, some not. But published or not, we still test things, and occasionally something comes up that I think I need to write up. The Sony FE 20mm f/1.8 G is one of those things. As wide-angle primes go, it’s reasonably priced […]

Canon RF 100-500mm Teardown

New Items

The Secret of the Broken Element: A Canon RF 100-500mm f4.7-7.1 Teardown

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In ancient times, the IS unit in Canon EF lenses was physically locked down, so the unit didn’t make rattling noises when the lens wasn’t powered up. Canon decided the lockdown was no longer necessary in modern times, so some RF lenses, like the Canon RF 100-500mm f/4.5-7.1, rattled when the lens wasn’t mounted to the […]

Equipment

Investigating the Canon R5 Heat Emission

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ADDENDUM: I should have mentioned in the text, all testing was done at 73°F (22.75C) ambient temperature.  Lots and lots of people are talking about Canon R5 heat cut-offs. The discussions range from technical discussions about heat generation, cooling methods, and firmware protocols to strident conspiracy theories. I only know a little bit about heat: Electronics […]

Taking Apart Canon R5

Equipment

Taking Apart the Canon EOS R5 Mirrorless Camera

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Let’s get one thing out of the way in the first sentence. If you’re here to understand the mysteries of thermal flow in the Canon R5 I can tell you everything I know without doing a teardown: It’s small, it’s weather-sealed, and photo-body cameras have limited ability to get heat out of the camera. I am […]

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