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Category Archives: Technical Discussions

Bad Times with Bad Filters

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A long time ago I wrote a blog post called Good Times with Bad Filters about how cheap UV protective filters are different from good ones. It was mostly in fun. Today I’ve got a post about how cheap UV filters may hurt your lens. It’s not in fun. Here at Lensrentals we see lenses [...]

There Is No Perfect Lens Test, Either

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In my last article, I wrote about the fact that every copy of a given lens has some bit of sample variation. This affects lens reviews, whether lab-based or photography-based, because the copy they tested will be just a bit different from the copy you buy. I suggested, that if you want to get a [...]

There is No Perfect Lens

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The Three Questions I get asked a couple of questions every time I publish a graph showing Imatest results for multiple copies of lenses like the one below. Most people understand that some copy-to-copy variation is inevitable in the manufacturing process. Most are surprised, though, at how large the sample variation seems to be. Heck, [...]

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 [...]