SX50 w/ Canon 500D attached...

You can also check this video from a Chinese review site:

http://www.youtube.com/watch?feature=player_embedded&v=zEOAN_MKmHY

Here you can check the complete review:

http://www.mobile01.com/newsdetail.php?id=12523

The Lock button is reviewed at 0:59, it shows the sever movement of a handheld attempt at full zoom of a very distant subject, then Lock is activated at 1.10. Pay attention to the little focusing frame before and after. Where before reminds me when I tried my Raynox 2.2x TC with my present SX30, and then I even asked Phil to consider an option to increase IS with his CHDK for those purposes

Ed