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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.

Geek Articles

Stopping Down Some Bargain Primes and Zooms

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In my last post, we looked at how the field curvature of some really excellent 35mm f/1.4 primes affected what happens when we stop down the lens. The takeaway message is that as you stop down, things change a bit differently with the different lenses, but by f/5.6 they were similar. Still slightly different, but […]

Geek Articles

How to Not Check for Ghosts in Equipment

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Someone remarked the other day that sometimes our equipment gets used in the recording of the various “Find the Ghost” or Check-Out-This-Haunted house TV shows. Someone else became concerned that if our gear was exposed like this, maybe some of it came back haunted or contaminated by malevolent spirits. Aaron and I, since we develop all the […]

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 […]

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