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.
Sigma Art Series 14-24mm

Equipment

MTF Tests for the Sigma 14-24mm f2.8 Art Series Lens

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Most of you know I’m a big fan of Sigma’s Art prime lenses. They give superior optics at excellent prices just about every damn time. I’ve been more mixed in my opinions of Sigma’s Art zoom lenses. I thought the Sigma 24-105mm f/4 Art was the best 24-105mm I’ve ever tested (and I hate testing 24-105s). The […]

How to MTF Test a Lens

Geek Articles

Developing a Rapid MTF Test for Photo and Video Lenses

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. . . Or What I Did for the Last Year Instead of Having a Life. Nearly a decade ago, I started testing lenses. A few years later, after I complained about a manufacturer’s claiming an awful lens was in spec, an engineer patted me on the head and told me “you really don’t have the […]

Color Shifts in Cine Lenses

Geek Articles

Looking at Cine Lens Color Shifts Using Spectrometry

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Please Note: This is brand-new stuff that we’re publicly experimenting with. We post it because it’s fun and interesting and we usually get pertinent comments and criticisms that help us refine what we’re doing. For those of you who don’t science much, please remember we’re still testing and improving this process. What we’ll look at today is […]

Testing Color Casts in Lenses

Geek Articles

A Geek of Many Colors – Adventures in Spectrometry

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Please Note: This is a Geek Level 3 Article. It has no useful information about photography or videography. If you’re a lens geek, though, it’s kind of cool. And it will serve as our background and methods for upcoming articles.   Well . . . How did I get here?    David Byrne One of the nice things that happens at Olaf […]

Veydra Lens Testing MTF Sharpness

Equipment

Veydra Cine Mini Prime MTF Optical Bench Tests

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I have my preconceived notions, just like anyone else. A long while back the video techs told me we were stocking Veydra Primes in multiple focal lengths for m4/3 mounts. I just rolled my eyes and passed on by. Another boutique lens that would have poor resolution, ridiculous copy-to-copy variation, and a shelf-life-until-broken measured in weeks. Not interested. […]

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