What does ISO do anyway?

MJAH, you mentioned you have a canon SD450. I have the SD550. Can you please post the settings you have your cam at when you take those amazing bud shots?
poiuyt Reviewed by poiuyt on . How do I get close up macro shots without the flash? Some of you guys take really good pictures. I can't. Whenever I try to get close up macros, the flash fucks it up. If I take out the flash, the pic becomes too dark. How do I fix this? Suggestions? Rating: 5