Found this super cheap fisheye on Amazon that fits perfect on the fd73. The optical quality is bad, but at 0.3 MP, you can sorta get away with it. Also, if you separate the lens, you can attempt macro shots or do cool abstract out of focus shots. Only actually...

Spent a long time ignoring mavicas. Always thought they were just too low spec to be worth using. Found one at the thrift for 5 bucks and couldn't say no. Been having tons of fun with it. Love the experience of using it, but the results can be... rough. Sorta ...