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Category Archives: Technical How To

The Sky is Falling and the Light is Leaking: the A7r Anti-Massacree

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Anti-Massacree - A humorous anti-war movement from the 1960s, suggested in the Arlo Guthrie song Alice's Restaurant. The song, like many of my posts, was criticized for being overly long. Believe it or not, I'm mostly a lurker in online forums. I read the hysteria of the day mostly for my own amusement. Sometimes I type a [...]

Why You Can't Optically Test Your Lens with Autofocus

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By far the most common email and PM I get basically says, "I think my lens is optically out of sorts. What do you think?" The second most common is, "So what's the best way to optically test my lens without a ton of equipment." Years ago I wrote an overly long post about testing [...]

What's All This RAW Hack Business?

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You’ve more than likely heard about the Canon 5D Mk III RAW Hack. We too have been keeping a close eye on the Magic Lantern (ML) team as of late. In the last 4 months they've enjoyed their greatest triumphs since initially cracking the 5D Mark II’s code almost 4 years ago. It’s been a wild ride, and even though it’s far from over, we’re ready to join in. The LensRentals crew [...]

A Tilted Element Demonstration

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One thing we preach here a lot is that just because a dropped lens looks fine on the outside doesn't mean it is fine. The other thing we preach a lot is that a tiny difference in the centering, tilt or placement of a single element can have a dramatic effect on image quality. Aaron made [...]

Guest Blogger Aaron Nace | How to Capture the Real & Surreal with a Superlative Lens

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Today's Guest Blogger Aaron Nace is going to show you tips on creating and compositing fantastical images with a lens he considers to be one of the best. Aaron is a Chicago-based photographer and retoucher who combines elements of reality and fantasy to create his images. Aaron has taught Photoshop and photography to over 100,000 [...]

Testing for a Decentered Lens: an Old Technique Gets a Makeover

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What is Decentering and What Does it Do? Strictly speaking, decentering would involve one or more of the lens elements being off of the central axis of the lens. This would prevent the curved surfaces of the lens from bending the light properly. In severe cases it could result in halos or ghosting. In most [...]