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You can shoot narrowband with your dslr, however it requires a mono conversion, and preferably cooling, to be most effective, and something to easily change filters, like the Teleskop-express EOS filter drawer. As your just starting out, i would recommend just shooting normal colour with your current camera, least risky, and put your money into a scope that provides true colour rendition. The most cost effective aperture, that provides true colour rendition, would be something like an 8" imaging newt. It will cost a fraction of a colour corrected refractor, but requires a rethink about your equipment priorities, and the money saved can be directed into a second hand EQ mount like an HEQ5 which could drive an 8" newt.
If you really want to image with a cheap achro refractor, then buy a ZWO ASI mono camera (they are cheap but provide a starting point). That camera would allow narrowband imaging. But the gotcha in narrowband is the cost of the filters and the requirement for long image exposures, so you need good EQ tracking and guiding capability. Which brings us back to the mount. If your serious about imaging you will need a good EQ mount.
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