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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.
Stopping down Lens

Geek Articles

Things You Don’t Know About Stopping Down Your Lens

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Warning: This is a somewhat Geeky article. It has some real points that are useful for anyone who uses lenses, though, so I’ve tried to keep it mostly in English.  In imaging, there are a lot of topics where people over-generalize; there’s a general tendency for something to happen, but people become convinced that the […]

More Ultra High Resolution MTF Tests

Geek Articles

More Ultra High-Resolution MTF Experiments

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GEEK ALERT!! Let’s be absolutely clear; this is not a practical or useful article. It won’t help your photography or cinematography become better. It won’t help you choose equipment any time in the next couple of years. It won’t provide any fodder for your next Forum War. It’s just a geek article that may interest some people. It […]

Sigma 35mm f/1.2 MTF Charts

Lenses and Optics

MTF Tests of the Sigma 35mm f/1.2 DG Art

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We just finished testing a couple of 35mm prime lenses and came away quite impressed. But it took a little longer to finish testing the one everyone had been asking about; the Sigma 35mm f/1.2 DG Art lens. I declared the Tamron 35mm f/1.4 SP the sharpest 35mm lens we had tested just a week […]

Button Breaks on Camera

Equipment

Why Side-Mount Buttons and Ports Break on Cameras

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We spend a lot of time fixing broken stuff. As sort of a side gig to that, we advise some manufacturers about what is likely to break or is regularly breaking. We offer our input to all manufacturers; some are interested in it, and some don’t give a flying damn. For free, we blog about it, […]

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