cokeaddict

hey man,

i'm no photographer, but i think this is a quite simple question to answer. lets start out at the beginning:

1) New Camera: Is 12MP enough for you? If yes, then the A7s and A7sII are excellent choices. The best, really, for what you want to do with them. You will be surprised how good they are in low light. Probably even better than your high expectation expect  . If no, think about going broke for the A7rII, as its also brilliant in low light, plus also comes with IBIS which you seem to dig. Its super expensive but completely worth it and a good investment for the next decade if you ask me.

2) A7s vs A7sII: The major differences for a photographer between the A7s and A7sII are IBIS and more focus point. I would argue that the upgrade should not be worth it to you at all. I'm actually quite certain. The A7s is so good in low light already, that you probably dont need IBIS to capture more light to begin with. And since your aim is astro photography (where objects usually dont move so quickly) you dont need those extra focus points anyway.

based on your question i would easily recommend the A7s. the only thing holding you back should be its resolution of 12MP. save the extra cost of the A7sII for other equipment. I dont know anything about astro photography, but i thought that especially there a high res sensor is super important. but if the A7s's made it to your short list, thats probably not the case. to my understanding pictures taken with the A7s are tack sharp at native resolution and wait with your purchase another 2-4 weeks. the price of the old A7s will probably go down even further. and dont forget to send me some sweet sweet wallpapers, ok?