Got this Makinon 28-80mm, f3.5-4.5 macro for $15 at a pawn shop this week. It is built like a tank weighing in @ 21oz/595gm. The front element is huge with a filter size of 72mm. Like the 135mm I got, it was very dirty but cleaned up nicely.
Here are some sample shots with it all shot @ f5.6:
1. FL 28mm
2. from the same position @ FL80mm
3. Maximum macro 1:5
4. another 1:5 macro
5. Our house for a different sort of pic.
Not bad for $15 but way too heavy for a walk-about lens.