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As Dennis has said, in-focus could be an issue, as might the % illuminated field. Dob Newtonians are usually built for visual observing. A Newtonian built for photography is known as an astrograph.
If you are able to reach focus, then yes you will need a T-mount adapter, you will also need an EOS to M42 adaptor.
This will get you started however you will see Coma (elongated stars at the corners of the photo) at some stage, if the photography bug bites, you may want to purchase a coma corrector which essentially replaces the t-mount, you will still need the EOS adapter.
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