san301173 , There does seem to be some lens options available, may need adapter, not sure. Check the links below, the 2nd link is a forum that discusses your issue. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
http://www.photo24.co.uk/telephoto-lens-for-canon-powershot-a630
https://www.flickr.com/groups/491069@N24/discuss/72157607007069915/
http://www.digitaltoyshop.co.uk/Wide_Angle_and_Macro_Lens_Canon_Powershot_A630_t907_4812