I'd been waiting to see when the Sony NEX macro lens would be available, but I found a modular kit of tubes on eBay & ordered them to see what it was all about. The shipment of macro lens and lens adapter fun arrived yesterday and I put the macro rings and Pentax 110 adapter to the test this afternoon.
The Macro Extension Tube Ring is essentially a series of threaded rings that allow you to increase the distance between your existing NEX mount lenses and the NEX sensor. I've uploaded the sample pictures to Flickr so that you can see the differing focal lengths.
The Pentax 110 Lens to Sony NEX adapter is exactly what it sounds like. I have three different Pentax 110 lenses (18mm, 24mm & 50mm) and it was interesting to combine them with the macro rings to see how close up I could get.
I took two different batches of photos and uploaded them to Flickr. I haven't yet picked a favorite Macro ring & lens yet, but there are a bazillion possible combinations.