Fun with expensive toys

I'm still getting to know the Canon 20D that Anne gave me last month. I've introduced it to my (15-year-old) 80-200 zoom that hitherto has hung out with my old EOS Rebel film camera. Because the image sensor on the 20D has only 63% of the area as a pane of 35mm film, lens lengths are extended 1.6x, making the lens, in effect, a 128-320 zoom. Combine that with bright daylight and selectable ISO speeds, and you get 1/3200 shutter at f/5.6, which eliminates camera shake:

Sadly, after carefully examining the raw version of this photo and the lens I used to take it, I have discovered that the 20D forgives absolutely nothing. Here's a detail of the original without any processing (though at higher compression than raw). Notice the subtle blue shimmer along the branch edges, and the general lack of focus? I believe those are lens artifacts. Given the dust visible inside the lens (in the sealed parts where cleaning is impossible without dismantling it), and the aging of the visible lens surfaces, I think it's time for a new long lens.