Thank you Claudemir.
If you want to get a feel for the destructive nature of "high ISO" settings on your camera's image check out these pages from the
www.dpreview.com website.
The first link below compares the Canon powershot g15 (presumably a very good recent offering from Canon in the point and shoot category) to other cameras in it's class. Notice at the top of the page is a contrived, complex scene. Next notice the blinking rectangle on the Martini bottle on the left. You can click and hold this rectangle and move it anywhere in the scene you like. That place where it lands is what you will see in the four comparison boxes below.
At the top left of the large scene you will see a drop-down which allows you to alter the ISO number for all of the four comparisons below.
You can also change each of the four comparisons individually to a different camera and a different ISO.
If you play around with this and raise and lower the ISO numbers you will get a feel for how destructive these high ISO numbers are on the quality of the image.
http://www.dpreview.com/reviews/canon-powershot-g15/10
This last link is identical except that it uses as it's base comparison the Nikon D5100 (a good camera but certainly not the best) and compares it to other cameras in it's class. This will demonstrate how much better the image can be at very high ISO's comparing a DSLR to a very good, so called, point and shoot camera. Raise the ISO number to rediculous levels and compare it to the Canon G15 at lower ISOs.
http://www.dpreview.com/reviews/nikond5100/20
Hybrid Mode
