The imaging sensor in the DSLR is actually just as sensitive as most other astro-cameras to the hydrogen-alpha wavelength; however, for daytime use, DSLRs are manufactured with a filter that blocks deep red through infrared (IR) light in a way that a typical astro-camera with an IR/UV cut-off filter does not. Fortunately, there is a way to make your DSLR more sensitive to this light and bring out these details in your deep sky images.
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