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The NEQ6 is rated at 20 KG payload which it will handle for visual as long as there is no wind! For photography you are right, a general rule of thumb is 50-75% of rated max is theoretical max for astrophotography. That is not to say that it won't do it, just that the tollerances for perfection get tighter.
Another thing you'll want to throw into the mix is a coma corrector like the Baader MPCC and t-ring adapter for perfect Canon back focus. There is no doubt that an EQ8 will handle it a lot better but as long as you get your balance right and don't try imaging in the breeze it will work. You will need patience though that's for sure. A LOT easier starting with a smaller short focal length scope first.
As has been mentioned, you'll also want to eventually get into auto guiding.
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