1. 有效像素 how big is the photo u can print, 焦距 how far u can shoot, 感光度, 連環拍攝 the speed of the camera, 儲存媒體 you have to buy , Accessories .. if you want to upgrade you camera , prices ... not inportant :), 外形設計 U should get one you like,
2.
A. You can just give the ..card.. to the prints shop and tell them what size do u want.
B. Save it into computer, and slightly ajust the photos first, then give the ..card.. to the prints shop and tell them what size do u want.