Local camera store had SmallRig cages for the Z8 in stock, so I got one. Not the ideal setup but it beats the universal L-bracket or generic arca plate. I think it works great and seems well made. For $70 the quality seems on par with all the other SmallRig gear I use and the value is excellent. Since I'm doing about an equal amount of video versus photos, it seemed worthwhile since I do attach a lot of gear to the camera.
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The biggest complaint about the cage is that it adds too much thickness to the grip and unlike their other cages, it doesn't have a 3/8 arri-style attachment on the left side of the cage. It also limits my options for vertical orientation on a camera that really supports it. I'll still likely get the Kirk or Pro Media Gear L-bracket when they're more widely available since I've had several in the past and I'm impressed with their quality. Here's what I can't figure out though: