I bought a Raynox DVR-2025PRO telephoto conversion lens with a 2.2x for my Fuji HS10 (now 10 years old!) so the maximum zoom I get is 2.2 x 30 = x66.

There is no way that I can hand hold and get a sharp picture on maximum zoom, in fact it's not easy to hold my camera steady with telephoto lens attached even on minimum zoom, so a tripod of some sort does help a lot.