ZOMG LEMONS!

no one?

I think your question is a little vague. What is .5cm off and what are you worried about it affecting?

Im aussuming that you mean a 5mm difference in boots soles, in which case YES it means a lot. Take your boots and skis to your local shop and get an adjustment by techs that know what they are doing.

i think the cutoff is 2-3mm then you'd have to adjust,  if you don't know what you're doing just take it to a shop.  if they charge you, they're lame.

I just got new boots, size 27.5, and they won't fit in my old bindings.  I've adjusted the travel to max., but I'm still off by a few mm.s    My old boot size was a 26.5, so I assume I should just remount them.  However, I am going to get these skis replaced under warranty at the end of this season, so it may not be worth it to remount.  I can always use my old boots for a bit.  What do you think?  is it worth it?