Another 40D owner here. Great camera.
I only have a few, possibly irrelevant suggestions to make
If you are looking at doing any astro work where you might want flat frames, avoid zoom lenses, unless you have a lightbox setup that lets you avoid touching the focus or zoom.
Ok, thats one suggestion. I said a few..
I like my old Pentax Takumar lenses - but the CA is noticeable (And in the event of a home invader, you can put one in a long sock and hit them with it). Dunno if that counts.
Cheers.
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