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Also, your Canon lens has such a small aperture compared to an 8" telescope.
The telescope is going to gather a lot more light a lot quicker than a tiny lens.
Also, 30 second exposures aren't going to reveal much nebulosity. You need to be taking at least 5-minute exposures to get decent nebulosity.
Having said that, at 5 minutes, the core of the nebula is going to be blown out (saturated). You can take shorter -- 10 to 15 second -- exposures and mask them in Photoshop.
Regards,
Humayun
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