Soto wrote in post #9105812
So 21MP is really not necessary... With 12MP is all you may need
Depends on how large you'll need to print right?!
I've taken pictures that have ended up very large (bill board size) and on a wall that's very close to people (go into the YMCA in Hong Kong and check out the rocks/water picture that's on one of the walls, that's my photo). Even then 21MP wasn't big enough (because of how close people would be to it) so the company that did it (the printing), put of a sort of brush effect that makes it a little less realistic, but better to look at up close.
HOWEVER, normally I don't print larger than A3 so 12MP would be fine.
According to an online MP calculator. 12MP can get you the following print sizes:
72dpi 59.1" (1,501mm) 39.3" (999mm) screen resolution
photo 28.4" (721mm) 18.9" (480mm) normal photo print
300dpi 14.2" (360mm) 9.4" (240mm) hi-res print (this is a little less than A3+ size I think)
21MP will get you this:
72dpi 78.0" (1,981mm) 52.0" (1,321mm) screen resolution
photo 37.4" (951mm) 25.0" (634mm) normal photo print
300dpi 18.7" (475mm) 12.5" (317mm) hi-res print (this is a little more than A3+ size I think)
21MP is actually just a little larger and in real life probably not all that much difference. Like Karl said, unless you're doing high end sorta stuff it's not really necessary.
