This is not about threaded zooming filters - and belongs in another thread. I'm still gonna post it here because that seems to be where the conversation is.
I'm about 1/2 done with a Rube Goldberg macro-ing post discussing several techniques, but..."screw two lenses together" seems like a legit one. I got some pretty neat pictures of alyssum that I'll go through soon and post to appropriate places...but wanted to get this one out to show the scale (unretouched, then crop of same because you lose so much detail when you upload) . Wow! I am having tons of fun.