Looking for best Sony camera to update my setup

Hello! I am a sony lover as well. Just wanted to chime in the A55 and A7 series have different mounts, unfortunately. A55 has an A mount and the A7II/III has an Emount. Deep sky is possible with the all the sony dslrs, but you could probably still take great images with the A55, hooked up to a telescope or longer lens (lenses will be cheaper with Amount, a lot of minoltas will fit the A mount). The 'deep sky' stuff depends firstly on a nice tracking mount, autoguider, etc. Save up for those first! I need to do the same on that front. I had an A58 I upgraded to A7II. Both great cameras, and the A7II definitely better for family photos, etc. But my A58 got excellent deep sky images with a cheap 300mm lens. Just some thoughts. Clear skies!

I had an A55 I used for astrophotography 8 years ago. I have gone through a few Sony cameras in that time. The cameras I use now are the A7III and A7RIII. The A7III probably has a little bit less noise at high ISO’s of the two cameras. Both the A7II and A7III have the same number of megapixels. I can tell you the A7II has far less noise than the A55, and the A7III has less noise than the A7II. Sony’s full frame cameras are very good for astrophotography. There are adapters that work quite well with Sony A type lenses and E type cameras. I have one and still use it.

Something you might consider is migrating away from Sony. Sony's noise spatial algorithm (star eater) still exists in a manner that is detrimental to star color, so much so, I am working to get rid of my Sony gear and heading to Nikon. That said, this predominantly shows up in tracked images, so if you aren't tracking, this isn't much of an issue. Ironically, the sharper the lens, the worse it gets (my stars from a Sony A7Riii and the Sigma 40mm are really, really bad). My A7iii isn't as bad, but it still has wonky star color (mostly green). I also don't expect it to be very bad if you are using it on a scope, but I have never had mine on a scope to test.

But if you are really wanting a Sony, I have a HA modded A7iii for sale ;-)

Good luck!

Here's a small summary of the Sony "star eater" problem: http://www.markshelley.co.uk/Astronomy/SonyA7S/sonystareater.html 

Hello everyone, I'm looking to get back into the hobby but need to replace my DSLR Sony A55, which is fast approaching 10 years old by this point. I don't want to throw down on lenses when I already have some, so I'd like to get another sony as to save money on this front. I just wondering what you would recommend for deep sky imaging. I want to try to get good at this, specifically with long duration exposures and stacks of galaxies and nebula's. So far the A7 II/III have gotten my attention, albeit the III being a bit steeper in price but the more megapixels is enticing, and I'd like to get some thoughts and opinions on these, or any other camera from sony that you'd recommend.

In the meantime thanks for the help.

A7III all the way, I've used one for a couple years now and its great! II has an issue with the star eater, but the III does not have it at all in my experience.

Gustav Lundby:
I do not give up on my Sonys. Now using them with RC8". Beautiful cameras for astro! Star eating?? You get more stars than you ever need.

*** How did you connect your camera, what type of connector?***