Hi, Thanks for your comments
I used the EFS 18-55 IS kit lens for those pictures. Shot at 18mm, F11 and bulb mode. Around 2~5sec exposure (each picture is different).
I crop away much of the land.. maybe that's why it doesn't appear like taken at 18mm.
Assuming if you're near the fireworks (e.g. bridge, esplanade area, skypark etc..), I would suggest using 18mm to capture the fireworks, especially if it's the first time taking that firework and you do not know exactly where the fireworks will appear.
It's better to capture more and crop later then being unable to capture the full bloom.
I'll recommend the 18-55mm.
But if you're much further away, then maybe need a tele lens.