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Hi Rod,
Welcome to the wonderful world of Astrophotography.
In short, yes you can use your DSLR for astrophotography. If you are connecting it to a telescope you will need a “ t-ring “ and “ t adaptor “ to suit your camera. If you are planing to shoot from a tripod then you will only be able to do short exposures before getting star trails ( because of the starts apparent rotation across the sky ) but still it’s absolutely possible.
As far as modifying goes, my suggestion would be to start without modifying and move onto that later once you get a little bit more comfortable. Basically what it is is inside your stock DSLR there is a filter/filters that block out the extreme ends of the visual spectrum such as ultra violet ( vu ) and infared ( IR ) . Many Deepsky objects emit these wavelengths of light so your DSLR will struggle to show them. That’s not to say there’s not a lot of things it can see. In fact Galaxies only have a minor change with a modified camera. Basically the modifying process removes this stock filter either entirely or replaces it with a far wider range filter.
I hope this helps
Feel free to ask as many questions as you like. The folk on here have a wealth of experience to offer.
Cheers
Ryan
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