So after letting my warranty expire on my 24L, and being frustrated with my own inability to take pictures in focus, I finally determined through focus testing that the calibration is beyond the limits of MFA. I would like to send my 50D and 24L to a Canon service center, as I've heard the results are excellent for this type of procedure. However, after spending so much money on the lens itself, it just seems like highway robbery for them to charge $250-$350 to correct this problem, even with it out of warranty. I'm just a hobbyist, and this lens has been babied through maybe 500 snaps, with absolutely no drops, no moisture, no dust.

Just wondering if there are any alternatives. Any DIY videos or tutorials on adjusting the lens myself? Or other shops to send the lens to? The focus is so unpredictable that I just don't use the lens anymore. I figure I don't have much to lose by taking an alternate route.

Dave