Maximum ISO setting 800? Hmmm!
Maximum ISO is the manufacturer's way of politely saying, "
Shitty, noisey, low contrast ....but technically possible"I've never met a maximum ISO that I liked and it's been the biggest improvement on digital cameras since their inception. My first camera was hideous at ISO400 but my latest is totally usable at 3200 (Max ISO is up at 128,000 or something silly...and unusable of course).
800 ISO is enough in most situations but that means you should be looking at a maximum of at least 1600. You'll never want to use 1600 in this case but it does mean that 800 will be better than total crap.
Unless there's a good reason, set it manually to the lowest ISO and, if necessary, use a pocket tripod rather than push the ISO to its limits. I have a couple of tiny "pocket" tripods (circa £3) that have come to my rescue many times. If nothing else they are good for family group shots on self-timer but they add a lot of sharpness (even if you think you can hold a camera perfectly still..you can't).