Reading through the posts looks like im not the only one that had or is having issues with there pentax 150 450mm lens , mine just recently stared to jam when retracing the lens barrel , it would stick around 200mm with a little jiggling i could get it to close fully , the lock also had stopped working , last time i had it out , it would not focus , the motor was running , i disconnected the lens and it appeared the rear optics had falling inside the lens casing , it would only sit in place when the lens was fully retracted , it was not jamming now but rattling , this lens is now 3 years old , I travel ( hike ) with this lens with a heavy strap . im thinking this is the reason it started to jam in the first place , with no warranty remaining , i removed the back lens plate for was curious what had broken inside ,from all the rattling . two round plastic cylinder type , with a screw in the middle fell out , im assuming this is what was holding the rear optics in place , how this came apart i can only guess from me trying to fully close the lens on several occasions , with last time being a struggle , when i tried to focus next time camera was powered up the focus motor strain must have snapped these tabs holding the rear optics in place , and from me trying to fully close it must have weakened the plastic tabs , only explanation i can come up with , I still don't know why then lens was jamming , I have dropped this off to my camera shop for return to supplier , but with no warranty i do not expect anything , only me being out the $3000.00 bucks , anymore then 500 bucks to repair i don't think is worth the risk , i think the parts to repair will be the problem , so my question is from reading all the posts on the issues with this lens , has it been corrected from the manufacture ? and if so is there any production date of the correction . i would hate to purchase another lens keeping the old one for parts , and finding out i have the same Friday production line ..... needless to say i'm very disappointed , being that i had saved and sold a few of my belongings off in order to buy this lens for wildlife photography , but anything with moving parts is always a gamble , wish there were more options with prime long lenes but they just dont exist in the pentax mount , nothing new at least . However one would think you would get more than 3 years out of a lens , if you own one of these lenes i would not recommend carrying it around on a tripod which i did do a lot of , and with the lock working half the time , i think this added to the problem for the lens would retract and extract on its own and not knowing this must have caused wear and damage internally , I don't think this is a work lens , after owning it and what has happened to it , keep it in is protective case until use , but then if your shooting wildlife with it like myself , animals don't tend to stick around long and wait for you to set up .
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