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Category Archives: Lenses and Optics

Optical Quality Assurance

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  Pinhole images from new, but optically decentered lens. Olaf Optical Testing, 2016   After we published a number of posts about copy-to-copy variation, people were quick to say that this company or that needs to 'just' improve quality control. I totally agree but realize most people don’t have a clue what ‘improving quality control’ [...]

LensRentals Staff to Participate in Reddit Ask Me Anything on Monday at 3pm ET

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We’re excited to announce that Roger Cicala and Aaron Closz will be participating in an Ask Me Anything (AMA) session of reddit’s /r/photography forum on Monday at 3 pm ET. Over the last few years, /r/photography has been a huge supporter of our blog, so we wanted to give back by inviting the users of [...]

What Actually Happens When You Stop Down a Lens

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I got an email the other day that got me thinking. A guy simply asked “How far do I have to stop down a lens to get maximum performance. I’ve heard two stops from wide open. I’ve heard down to f/8. Which is correct?” I asked him which lens he was referring to, and was [...]

How to Use AF Microadjustment on Your Camera

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The most common questions and complaints I hear almost always have to do with AF accuracy, in one way or another, even if they don’t seem like it at first. “I’m trying to focus on this person’s eyes, but the ears are in focus instead,” or, “This lens is front focusing like crazy,” or, “This [...]

Sigma 35mm f/1.4 DG HSM Art Lens Teardown

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Last week we did a tear down of the Canon 35mm f/1.4 Mk II, an expensive, large, weather-resistant lens. Then we did a tear down of the Sony FE 35mm f/1.4 ZA lens, and expensive, weather-resistant lens with very different technology. Today we're going to tear down the Sigma 35mm f/1.4 DG HSM A1 (Art) lens, [...]