Aaron, they are used for two totally different areas of photography really. Yes you can do planetary imaging with a 350D but the ToUcam will do it much better 99 times out of 100. A modified ToUcam will take DSO images but the 350D will again leave it for dead. If you're going to be interested in both aspects of astrophotography, get both. The ToUcam plus adapter is only around $190, around 10% - 15% of the cost of the 350D
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