LensRentals.com

Category Archives: Technical Discussions

Lensrentals’ Canon 5D Mk IV Teardown

Posted by

    Today the Canon 5D Mk IV cameras are out and I’m sure by this afternoon there will be unboxing videos all over YouTube. Aaron and I decided to do an unboxing post, too. By unboxing, of course, we mean taking it apart. If you want to make comparisons, you can look at our old (2012) […]

“Help, I Can’t Open These Raw Files!”: What Do When New Cameras are Released

Posted by

Every time a new camera is released, and usually, for a couple of months afterward, I get lots of calls and emails from customers asking why they can’t read the Raw files they just shot. “They’re just CR2/NEF/ARW files that I should be able to open! Something is wrong with the camera you sent me.” […]

The Ultimate Light Modifier Shoot Out and Test

Posted by

As someone who has taught off camera lighting for some years now, as well as taught dozens of workshops on the topic – I’ve always heard the same question from photographers who are using off camera lighting for the first time. “What’s the difference between ____ and ____.” When working with off camera lighting, it’s […]

The (sort of) Great 400mm Lens Shootout!

Posted by

I get asked a lot about different telephoto lenses. Is the 400 DO II better than the 400 DO? Which is better, the Tamron 150-600mm or the Sigma 150-600mm? You’ve probably noticed that I don’t answer those questions. The reason is simple. Our optical bench is designed to test lenses up to 2.5kg weight and […]

More PhotoGeekery: Finite Conjugate MTF Bench Tests for Macro Lenses

Posted by

For the last several years we’ve talked about the fact that lens performance can vary with focusing distance. Our optical bench tests at infinity. Computerized target analysis (Imatest and DxO) tests at close distances. But when the results of target analysis and bench tests differ it’s hard to decide if the difference is because of different testing […]