crwdns2934241:0crwdne2934241:0 meltec

crwdns2934249:0crwdne2934249:0:

I would guess the focus setting might be on continuous mode but check your settings here..

http://www.kenrockwell.com/nikon/d90/af-settings.htm

crwdns2915684:0crwdne2915684:0:

open