It has also been pointed out that:
Originally Posted by polyglot
1) It will cover 35 mm format, even larger formats, when you use it for what it is meant to be used.
2) that being 30 mm does not make it a wide angle lens.
Angles of view change with lens to subject distances.
The purpose of making close-up lenses short is to avoid huge amounts of extension.
I'm very happy with my 16 mm lens, because i would hate to have to figure out how to get to 10:1 using an 80 mm lens.
But 'wide angle"? Where? How?