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.
How to MTF Test a Lens

Geek Articles

Developing a Rapid MTF Test for Photo and Video Lenses

By

. . . 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

By

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

By

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

By

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. […]

40mm Lens MTF Testings

Geek Articles

Finally, Some More m4/3 MTF Testing: Are the 40s Fabulous?

By

It took me a bit longer to get back to m4/3 testing than I expected, but we have an interesting set of primes to look at today, the ‘about 45mm’ group, which includes several 42.5mm and a couple of 45mm lenses. Please don’t get all worked up about that small difference in focal lengths; it’s […]

Follow on Feedly