Na temat roznic ironicznie wypowiada sie facet na www.dcresource.com :
There's a $100 price difference between the A630 and A640 -- what does that buy you? The A640 has two million more pixels, support for remote capture, and a charcoal gray body. Oh, and a slightly larger bundled memory card, too. Of course, the higher resolution A640 also has a slower burst rate and larger file sizes than the A630, so keep that in mind.
Czyli roznice zadne, jesli nie bierzemy pod uwage zbednych 2 MP. Z dalszej lektury wynika, ze te 2 dodatkowe MP nie psuja jakosci zdjec przy wyzszych ISO, choc teoretycznie moglyby. Ja sie wahalem pomiedzy A630 i A710. Ostatecznie kupilem ten drugi.