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Most astro imaging programs are geared toward the canon cameras.
I've had 2x 20d's, a 550D, a highly modded 1100D and am now looking at buying a backup 1100D.
The only Canon lens I use is the very reasonably prices Canon 50mm F1.8 ($100 new) The other lenses I use are Tamron's, the 17-200mm for day to day use and night scapes, and the 90mm Macro F2.8 for astro imaging and macro work.
If you have lenses from other cameras you can buy adaptors for them to suit the Canon. They cost less than $20.
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