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A lot of it will depend on what you're imaging. Probably the biggest issue with an un-modded camera is it's inability to capture H-Alpha due to the IR filter they have. They can get the tiniest bit, but if you're on a target like the Rosette Nebula it takes many, many hours of data to get anything as it is mostly Ha. You would do much better looking for bright reflection nebulae or galaxies.
Orion works so well because, while having a large amount of Ha in the region, it also offers a lot of reflection from the bright stars.
Cheers,
Mark
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