This level works very well for what it does. However, its design is very poorly thought out, which limits its functionality. If you look at the picture you can see that there are 2 clips, so this layer can be fixed on the camera in 2 different ways. However, they may not realize that the second clip is completely redundant and does not allow for any useful orientation other than the first clip. As a result, in landscape mode you can rotate the level to go either left/right or front/back, but in portrait mode you can only level the camera front/back. It's kind of pointless. For most photography, you'll almost always want your horizon to be oriented left-to-right, but it's rare that you'll worry about your camera being oriented front-to-back (usually more of an artistic/compositional factor) . If indeed that extra clip was placed on the other side, you could point the camera in any direction in any orientation. In its current form, the level is practically unusable for shooting in portrait mode.
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