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.
Stopped down MTF Tests of cineLenses

Geek Articles

Testing Lenses: Stopped-Down MTF Curves

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For quite a while now we’ve been publishing our MTF curves. They’ve always been the same thing; at least ten copies of each lens, in 4 rotations, and measured at the widest aperture. The reasons for that are (to us) very straightforward. Our purpose in doing the tests is to establish reasonable expectations, learn what type […]

Water Corrosion of a Sony A7sII

Equipment

About Getting Your Camera Wet… Teardown of a Salty Sony A7sII

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People think that because I expect the worst and try to prepare for it, that I’m negative. That’s not it at all. I’m not a negative person; I’m cheerfully cynical. If I expect the worst and it doesn’t happen, I’m happy because things went better than I expected. If I expect the worst and it does […]

Testing Circular Polarizers

Equipment

My Last Circular Polarizer Post

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I posted an article about circular polarizing filters recently, letting you see some data I obtained for Lensrentals when they were reviewing which of the polarizing filters were among the best. I concluded that they all polarized light really well. I also said that none of the CPs I tested seemed to cause optical problems at […]

Taking apart a Minolta Lens

Equipment

The Minolta 40-80mm f/2.8 Gearbox Zoom; The Clockwork Lens

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There were giants in the earth in those days . . . They were mighty men, men of renown.  Genesis 6:4 I’ve always been fascinated by the history of lenses. I write about it a lot. To me, the most fascinating items are those made many years ago, with what we would consider wholly inadequate technology, which did things […]

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