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.

Teardowns and Disassembly

Nearly Complete Teardown of The Canon 70-200mm f/4L IS II

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So, some things happened recently. We got stock on Canon EF 70-200 f/4L IS II lenses, and even though they go out on rental the day we get them in stock, we were able to do MTF testing on them.  The very low sample variation we saw made us want to take one apart and […]

Lens Test of the 70-200mm f/4IS II

Lenses and Optics

MTF Tests for the Canon 70-200mm f/4 IS II Lens

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Back in the day, and it was way back, my first “L” lens was the Canon 70-200mm f/4L, which I chose primarily because it was a bit sharper and a lot cheaper than the 70-200mm f/4L IS. I moved on years ago. Those lenses were good back then, and perhaps adequate for quite a while, but […]

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 […]

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