please let me know how deathly sharp this lens is with your 50D @ 2.8 and ~8. The F4 isn't doing much for me and I could use the nice suitcase too.
Enjoy your lens.
2000 740i-Annalisa and 2008 335i-Weebl. Weebl may wobble but has DTC
2012 X5d in Sparkling Bronze ( The Ultimate Cat Carrying Machine)