This afternoon I was walking in my backyard and I happened to look up and to the south.  The moon was low in the sky over the trees and I thought I'd try to grab a shot or two.

Panasonic G1 Nikkor 300mm f4.5 + Nikon TC200 2x teleconverter

I wanted to get the most magnification I could so I reached into the lens drawer and pulled out the beast, my Nikkor 300mm f4.5.   This is a big, heavy, long lens.  When I bought it it was really, really dirty and had fungus on the rear element.  I cleaned it and cleared up the fungus and now it works just fine.  I then coupled the TC200 to the back which effectively gives me a 600mm lens.  

I then put it on the front of my Panasonic Lumix G1, which has a 2x crop factor, meaning I now had a 1200mm lens.  I hauled the tripod out back and set up.  I focused on the moon and looked at the rear screen.  To my amazement, I could actually see the moon move across the screen!

Nikon D7000 35mm f1.8G

This isn't a setup that has many applications, but taking a shot of the moon is the one place that it excels.