Sigma 19mm DN Art f2.8 Amazing Lens with a Video Auto Focus Problem.

The very first lens I bought for my Sony a6000 was the 19mm Sigma DN Art f2.8. For under $200 you get a lens that is super sharp. According to most reviewers, dollar for dollar, it outperforms the competition.

Flag over Washington (Half Mast)I have been very happy with it. I’ve taken some great pictures. On an APS-C sensor, the 19mm is a handy focal length for catching pictures of kids inside the house. It’s not too bad for wider landscapes. Or shots like the one above.

There is a problem, however, when you use it with AF turned on for video recording.

I didn’t notice it for a long time. If you’re running hand held, you might never notice it. On Youtube it’s not easy to see, unless you’re looking for it. And I wasn’t. The I pulled up the footage on my computer. How could I miss this?

But now that I’ve seen it, I can’t look at any footage on a tripod or slider without seeing it. What is it?

Here’s a video that shows the issue very clearly. Watch the edges:

Slowed down like this, the jitter on the edges of the frame is very visible. I pulled down a few videos I shot with it. (But not everything.) But every video I’ve checked has the issue. I’ve used the lens for several videos, but none were reviews of the lens. All were about something else, so I didn’t notice. they look fine where the center of focus is, where your attention is drawn. I don’t “pixel peep” with most of my gear. The center of the lens is sharp, and looks great. But with the autofocus on, the edges shake and jitter.

When I was researching this lens, every review was positive. I didn’t find one mention of this issue. Now there are a few posts about it. Some videos like the one above. I’d hate for someone who wanted this lens for video to not know about this issue, so I’m doing my part.

I love this lens for pictures. But I can’t recommend it for video.

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