![]() Other than that, this does provide yet another piece of evidence in the message I keep trying to deliver: When you ask about this Sigma lens or that Tamron lens only ask people who shoot the same camera that you shoot. If you just use third-party lenses, but don’t care about why this happens, just drop down to the last table and at least we’ll show you exactly when it will happen. I’ll warn you, though, if you don’t use third-party lenses on Canon cameras, or you aren’t into how camera electronics work, you’ll find this very boring. Plus it gave a few hints about how cameras and lenses talk to each other. In the end, though, we ended up with some useful information about what does cause the issue and debunked at least one myth. Like so many things we look into in our lab, it ended up creating some new questions, too. ![]() Instead of a couple of hours, it was over a week. So I thought I’d spend a couple of hours trying to figure out what was actually going on. Several claimed only bad photographers noticed it while others felt it was a rumor started by Canon to keep people from buying third-party lenses. Some people assumed it was because the third-party lenses identify themselves to the camera as this or that Canon lens. Some people saw the same lens act up on one Canon camera but not a different one. ![]() The interesting thing was some people clearly had the problem with a certain lens, but other people clearly didn’t have the problem with that same lens. Several people emailed me about different combinations of cameras and lenses that did similar things. Sigma 180 f/2.8 OS jpg shot on Canon 5D MkIII
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