I bought this 5 years ago, then i bought a fuji 6900 so my slr was put in the shed for about 4 years, till this xmas when i got a 20 D so i had to go and dig out my eos stuff from the shed took bloody ages, big shed stuffed full.
stuck this lens on and i was shooting away at f5.6, crap, back in the shed, then this week we were getting the birds back in the garden and i couldn,t reach them with my sigma 28-70mm f2.8 so back in the shed for this lens.
tried differant f stops f8 upwards i was getting fantastic results all hand held. Just whack the iso up to get the shutter speed very little noise on the 20 D i just shoot away at iso 800 and 1600. I cant fault this lens now, if this is the result i get with this lens i gota get an L series lens. you want proof email me for photos , Dave