I'm going to get an HS20, but I was wondering whether the footprint and lens are Identical to the HS10? In other words.. Would I be able to set up a Ceiling mount using a friends HS10 (Hi John!) as a template? I'm trying to get everything ready to just slot the HS20 in when it arrives. Also, do you think it would have been polite to have asked that friend IF you could do this with his PJ before posting to find out whether it's possible?? Cheers, Mark.