I bought a 50mm Olympus OM lens to use on my "extreme conditions" OM 1. The aperture blades are a little sluggish to retract after a shot has been taken but I can't see any oil on the blades so I'm assuming a small spring or some other part is just a bit old and worn. Will this condition have any effect on my pictures? Can it be cheaply fixed? The seller pointed out this "condition" with the blades in his ad so I knew what I was buying and the lens was priced accordingly. It's basically a sacrificial lens for extreme conditions so it's not crucial that it functions flawlessly, but if it will affect my pictures then I might get it repaired if it's a relatively easy job.