I have have the pt-ax 100u for about 3 year now , and I have have the same problem with the iris that several other have comment on . Panasonic be no help and want load of money to repair the unit . of course , it be out of warranty as well ! so instead , I do a google search and find several home `` fix-it '' solution . basically , the iris mechanism have to be re-lubed with some oil after about 2 year of use . I fix my projector in about 20 minute -- and im not technically savvy either . if I can do it , I guarantee anyone can ! as far as the the bulb , I have easily make it to the 2000 hour mark with excellent video quality . I still think this projector be a fantastic bargain !