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.

Geek Articles

Things You Didn’t Want to Know About Zoom Lenses

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The intersection (perhaps collision is a better word) of art and science is interesting. The scientist says “your impression is not as important as my facts.” The artists say “my impression is all that matters.” Imaging is that way. The photographer or videographer getting the look he wants from a piece of equipment is all that […]

Geek Articles

MTF Tests for the Sigma BBL: The Big, Beautiful, 85mm Art Lens

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Yes, I know the Sigma 85mm f/1.4 DG HSM Art lens just too big for you; reading the online forums, you’d think it was about the same size and weight and a 600mm f/4 lens. It’s not, of course, although it is a hefty lens at nearly 40 ounces. But that’s just a few ounces more […]

Equipment

Opening up the New Canon 70-300mm f/4-5.6 IS II

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As with most new lenses, a Canon 70-300mm f/4-5.6 IS II made it’s way back to the repair department for an initial tear-down. I know there’s some randomness as to what we tear down, but we have some reasons for doing these. Sometimes, like with this new Canon, it’s simply because we know Lensrentals is […]

Geek Articles

Third Party Ultra-Wide Lenses MTF Comparison

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Contrary to what most people believe, we do pay some attention when people ask us to do MTF testing on certain lenses. I’m not saying we do it, but we do pay attention to the requests and when we have some downtime will look at that request lists and see if there’s something on it […]

Equipment

Front Element Lens Protection Revisited

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The internet is an interesting resource. Once you’ve put a reference up, it’s there forever. Over time, things may change, but that 10-year-old article doesn’t. A few weeks ago someone used some old articles I’d written (1, 2, 3) as a reason why he doesn’t use protective UV filters. They claimed I had said there was no need […]

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