Hi Stef and welcome to IceInSpace!
Who told you a 10" wasn't good? The dobsonian mount isn't good for astrophotography, but the OTA is just fine.
Does the skywatcher SW600 come with an EQ mount? That's an 8" reflector isn't it?
There's a very good astrophotography starter package for sale in IceTrade right now, a SW600 OTA and (separately) an EQ6 mount.
The only thing I'd do differently is use an ED80 or similar as the OTA, as starting with an 8-10" newt for deep-space astrophotography will be challenging.
However if you're doing lunar/planetary, the 10" newt OTA is perfect!
What do you want to photograph?
What is your budget?
Regarding the dobsonian, you CAN take pictures with it, but you're limited to the moon and some planets - see my article here:
Astrophotography with a Dob