It has an extension front barrel, which was a fairly new invention at the time this lens was released, and that front Barrel extension is wobbly, and yet it does not seem to affect the pictures. The build quality of this is quite sketchy, and yet it is known to be a surprisingly good lens. This was the kit lens for low-end Nikon film cameras throughout part of the 1990s, and as such it is understandable that Nikon made a good effort and at the same time kept costs down. Many people are taken aback by the plastic lens mount, and yet this is not a really critical component in terms of durability. Most people do not change lenses that often and so a plastic lens mount was substituted in place of a metal lens mount. As I recall the lens only weighs 10.4 Oz.