Category Archives: Equipment

Sigma 24-35mm f/2 DG HSM Art MTF Curves and Sample Variation

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For years now, I've been telling people to always take the results of tests done on one copy of a lens with a serious grain of salt. Not matter how carefully it was tested, it's still just one copy. Others will be worse. Others will be better. Because I'm so aware of copy variation, I [...]

Sony a7R II Vs a7S Video Field Comparison

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The amazing low-light performance and ability to shoot in 4k has made the Sony a7S a definite favorite for our customers and the LensRentals team. We have been very excited over the release of the a7R II with new features such as 5-axis in-body image stabilization, a 42.4MP back-illuminated full-frame sensor, and in camera 4k. A few [...]

MTF and Variation: An Example

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We've spent most of the last month establishing a database of MTF curves and expected copy-to-copy variation for a number of lenses. Most people have a general idea about what we're doing, can follow along the basics of MTF curves, etc. But many other people also have a very good question, "How much of a [...]

Sony a7R II: A Brief Review

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I’ve been a fan of the Sony a7 series bodies for a while, and I’ve been incorporating them into my paid work slowly but steadily. I was lucky enough to already try the new Sony a7R II at a wedding I was second shooting for Well Worn Co. I figured that would give me a good [...]

Quick MTF of the Tokina 24-70 f/2.8 PRO Fx

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Courtesy Tokina, USA Tokina is releasing a new competitor in the 24-70mm f/2.8 standard zoom lens group. It's a reasonably sized lens, having an 82mm diameter front ring, measuring 4.25 inches long, and weighing 2.2 pounds. That's just a bit smaller and lighter than the Tamron 24-70mm f/2.8 VC USD or Canon 24-70mm f/2.8 Mk [...]