<p>Hi Richard, Eric,<br>
Thanks for your responses. The microswitch is set as 'normal', it would limit the zoom between 50mm and 105mm, but the jam is around 35mm. <br>
The store will refund it if I take it back, but it's a bit disappointing that after longing for a good copy, some glitch has made it slightly inconvenience to use.<br>
Thomson</p>