37 
Zoom lenses are expensive. Telephotos lenses are really expensive. But if you want to shove a little extra optical oomph into you camera, this 2x £32 telephoto adapter is a killer deal. Just screw ‘er on and shoot.
It’s as easy as it is cheap—each lens adapter is made for whichever lens you’re seating it on—77 through 49 mm threads—and about doubles the focal length of your cam. A 50mm lens becomes a 105mm, pretty much. And for £32 (plus reasonable international shipping), that ain’t bad! The thing is pretty, cheap, and portable—three wonderful adjectives, and rare when it comes to photography. [Photojojo]
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Link broken, should be: http://photojojo.com/store/awesomeness/telephoto-lens-adapter/
I doubt the quality will be that good through it (loss of light through extra lenses/air).
…anyway, where is the link to it?
Clicking on the [Photojojo] link at the end of the article just comes up with a “Page Not Found” page…