For photographs I leave my C1 in maximum resolution mode 3.2MP - but for the C5 it may only be necessary to leave the photo setting at 5MP even though it can interpolate upto 10MP (IIRC?). 5MP is more than ample for A4 (and A3) prints where you aren't going to gain any extra detail from the 10MP interpolation but will also eat up the card quicker!!
On the video side of things it gets a tad more tricky!
Even though I live in the UK and we use PAL tv systems(25fps) I actually set my camera to NTSC because it records 30fps. This results in more frames per seconds hence better perceived picture quality - but once again will eat up the memory card ever so slightly quicker but I think its worth it for the extra quality!
This also has a benefit further down the dvd movie making side of things where it is also better (and more accurate) to create home DVDs in the NTSC standard rather than PAL!
Once again we are getting more fps (frames per seconds) broadcast from a NTSC DVD disk compared to a PAL DVD disk and so will achieve a better picture quality. Also there will be no frames lost as there is with a PAL DVD disk.
One frame is lost every second from a PAL DVD due to the difference in DVD fps and tv output fps. ie 24 fps vs 25 fps. This results in the PAL DVD playing back 4% quicker than the equivalent NTSC version!!!
You might find this page quite interesting reading aswell:-
www.michaeldvd.com.au/Articles/PALvsNTSC/PALvsNTSC.asp The following table illustrates the common aspect ratios presented on DVD along with the total active pixels presented in each possible DVD format. I have highlighted the best formats in green.
Aspect Ratio 4x3 PAL 16x9 enhanced PAL 4x3 NTSC 16x9 enhanced NTSC
1.33:1 720 x 576 = 414,720 538 x 576 = 309,888 720 x 480 = 345,600 538 x 480 = 258,240
1.66:1 720 x 461 = 331,920 671 x 576 = 386,496 720 x 384 = 276,480 671 x 480 = 322,080
1.78:1 720 x 430 = 309,600 720 x 576 = 414,720 720 x 358 = 257,760 720 x 480 = 345,600
1.85:1 720 x 414 = 298,080 720 x 554 = 398,880 720 x 345 = 248,400 720 x 461 = 331,920
2.35:1 720 x 326 = 234,720 720 x 436 = 313,920 720 x 271 = 195,120 720 x 363 = 261,360
Key Best Second Best Third Best Worst
Lee
www.xacti.co.uk