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Sara, it will depend on the stock camera's general response to Ha. Some tend to show more response than others. Narrowband filters certainly can be used on unmodified cameras but the exposures are often much longer than a modded camera. Below is an example I took using a 7nm Ha filter on a stock Fujifilm XT100 mirrorless camera. I got a result but from memory my exposure was several minutes with a "fastish" lens and high iso. Of course you have to use a tracking mount for this type of photography. You need quite a few subs as well, to cancel out the noise. A minimum of 25 subs will generally give you a reasonable result with Darks added and Flats if required.
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