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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.
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, […]

70-200mm f/4 MTF Charts

Just MTF Charts

Just the MTF Charts: 70-200mm f/4 Zoom Lenses

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We did the 70-200mm f/2.8 lens MTF charts last week, so let’s do the f/4 versions of the same range now. Sports shooters and portrait photographers need that f/2.8 aperture, but many of us, most of the time, are willing to trade that off for smaller-lighter-less expensive f/4 models. So, About f/4 Before we start, let me […]

MTF Charts for Zoom Lenses

Just MTF Charts

Just the MTF Charts: 70-200mm f2.8 Zoom Lenses

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Well, I’ve avoided putting up the zoom lenses as long as I could, but here we are. I’m going to do things a little differently; rather than listing by brand I’m going to try listing by range and type. I’m suspicious of it because it’s going to bring out the Brand Zealots who for some […]

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