In choosing a used digital camera for astrophotography, be aware of changing technology.  Circa 2008 the hardware design of pixels started changing.  The change suppressed dark current and lowered the noise from dark current.  Uniformity at low levels started to improve a lot.  It took a little longer for the new technology to get into the entry level cameras.  By 2014 the dark current suppression technology had improved a lot as did uniformity.  So in choosing a camera, stick to after about 2010 models--the later the better.  Also be aware that some models do raw data filtering that you can't turn off.  The filtering varies from deleting stars to turning stars green or magenta.  So do a web search for:

"camera model number"  raw data filtering

For more info on dark current suppression, see:

https://clarkvision.com/articles//dark-current-suppression-technology/

and

https://clarkvision.com/articles/technology-advancements-for-low-light-long-exposure-imaging/

I have a list of some of the cameras that filter raw data here:

https://clarkvision.com/reviews/image-quality-and-filtered-raw-data/

Roger

Alex Langfield wrote:

I’m on a bit of a budget here and I’m looking to potentially buy someone’s old dslr, it’s been a bit of a process to get going for me, but was hoping someone might have an old one for sale.

This will be my first astrophotography camera so I’m hoping to get something to just learn on. Nothing fancy. 

I'm currently waiting on a refractor scope to come and will put a t-ring on the scope. Hope to hear from someone soon!

If you have time, you might try and check out Englewood Camera ... its on Broadway and Littleton Blvd.  They have lots of cameras and really friendly helpful folks.  They might have what you're looking for or give you some ideas. I like looking at actual physical cameras and get a feel for what's out there.

I’m on a bit of a budget here and I’m looking to potentially buy someone’s old dslr, it’s been a bit of a process to get going for me, but was hoping someone might have an old one for sale.

This will be my first astrophotography camera so I’m hoping to get something to just learn on. Nothing fancy. 

I'm currently waiting on a refractor scope to come and will put a t-ring on the scope. Hope to hear from someone soon!