I have decided to run an experiment: capturing Ha with a stock DSLR. Stock DSLR typically blocks 85-75 % Ha light, then given the structure of a sensor in the color camera, which DSLR is, you would only capture 1/4 of the light reaching filter. So I put Ha clip-in filter into my stock camera and embarked on that journey. Here is results of 6 hours of integration, all in all it was quite a waste of time. But I confirmed that it doesn't make sense to shoot Ha with stock camera. It's NGC 7822.