Pssssshhh. If you think this is slow you haven't done astrophotography yet. 15s is where exposure starts.
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A LARGE LARGE LARGE portion of why I want an a7 series camera is actually solely for the improvements it'll bring me both directly and indirectly. ESPECIALLY based on one lens in particular. Right now my BEST lens, bar none, is my f1.4 50mm FD lens. BUT, on APSC, it's a telephoto, which means I have to shorten my exposure times to prevent star trailing. My 30mm is only a 2.8, which is significantly less light. Going to a full frame means I'll already get an improvement in noise just based on sensor size, and then my 50mm becomes that much more usable for capturing the sky since it'll be wider and avoid star trailing much better. It's a two for one. My only other option is to get a wide ass f1.4 35mm or some such, but at $500 for Samyang's offering (I'm not doing no focus by wire crap for stars) it's a bit too much.
Most of these were taken between F5.6 and F8, using a closet light for the "outdoor/street" lighting, and then my phone's flashlight as the interior's lights, so didn't have a whole lot of room to work with. TBQH, I need to find some small, dimmable LEDs or something. Hardest part was not overexposing the phone's flashlight too much, or I actually would've pushed my exposure times even longer.