Fred Miranda
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 p.8 #6 · Nightscapes using AstroTrac Tracking Mount | |
Sunny,
From the reviews and comparisons I read online, a modified camera like the T4i will let 100% hydrogen-alpha pass through. With the Canon 60Da, not so much...
You can use both cameras for normal non-astro shooting as well, however in the case of a modified T4i, it will need a special clip-in filter or custom WB for accurate colors. The D60a works normally without the need for custom WB or filters.
Modifying your camera will void the warranty so it's better to get a refurbished T4i for about $500 and sent it in for a Baader UV/IR filter mod. I recommend sending it to Gary Honis. He's well-known for this job and modified my own camera.
Keep in mind that you can already start shooting with your full frame un-modified camera and the Astrotrac mount. This shot was taken with an unmodified 6D.
Modified cameras are helpful recording hydrogen-alpha in nebula. You should be fine with other targets without much Ha.
Eventually you need to add a guiding scope to your gear to be able to take many shots and stack them.
I hope this helps,
Fred
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Seriously, You're coming up the same curve that took me more than a year to cover. Congrats!
A Murphy's Law Astronomy corollary states that the crappiness of the weather will be in direct proportion to the amount you spent multiplied by how anxious you are to try it out. 
