Originally posted by scorpioh Did you have to open up the lens to rearrange the blades? (I am supposing a definitely yes.) Also, will there be chances of lens misalignment issues when you close it back? Thanks.
To rearrange the blades, it must be accessed from the front. That means the filter rim and the front lens group must come off. Depends on the lens design, most Pentax prime lenses are rather simple for this to be done. Since the lens group can be unscrewed easily, you cannot mess the optical alignment (unless you drop it). The hard part comes when you tried to rearrange the blades w/o making the glass surface dirty. You will need a curved tip tweezers for the best possible grip, and a bit of luck and patience. It might take many attempts before you are completely happy with the results. I supposed trained technicians should be more proficient though.