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I assume you are talking about Ha signal ? (656 nm )
Most DSLR's require a modification to remove the factory installed IR filter on the sensor to see near Infrared spectrum. The filter is removed and an external IR filter which is open to Ha wavelength is used to extend the sensitivity.
I've modified a spare DSLR and added an external filter which gets it back to near normal performance but yet to use it in anger. From the little I understand about Ha high Resolution is not absolutely necessary or even good but I may be wrong. Most DSLR astroimagers are using Canon cameras for imaging as there is plenty of excellent software for them. EOS 1100D & 1200D appear to be cheap, low noise and work well IIRC.
High Shutter speeds ? Near IR is low luminance and requires longer exposures with higher ISO settings normally but maybe I am misunderstanding your project requirements.
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