As has been pointed out, it's an APS lens and will not cover a 135 frame. As to the original question, wider macros are useful when you want to get some perspective effect into the shot rather than flattening everything in the scene. Clearly it's of little to no use shooting insects, but if your subject won't run away then it can be a good effect.
The wider perspective means that with a small subject (hey, it's a macro!), the distance between the camera and subject better matches the scale of the item being photographed and as a result, the item can look larger and/or more natural than it would with a longer lens.
If you want that effect on 135, may I recommend the CZJ Flektogon 35/2.4? It goes to 1:2 without tubes, has great sharpness and lovely bokeh.