The mount that it is on looks like a lighter version of an EQ3 GEM. It looks a bit light to hold that particular scope without coming up against too many problems. Certainly don't expect to be able to do any serious photography on it or be particularly steady. The 150mm would be more stable, though not as much light gathering.
I like the look of the skywatcher above it, the 150X750PEQ3,
as far as mount size verses scope size. I have an almost identical mount and while it is fine for visual work at low to medium magnification (up to around 150X), it also suffers a fair bit from the "wobbletronic syndrome" at higher powers, though it wouldn't be as much as the GS-600. Also if you can try to avoid that particular aluminium legged tripod. They just add to the wobbletronic problem. As I said ok for visual, not too crash hot (no pun intended) for more than ToUcam imaging of the moon and planets and SLR imaging of the moon. The only thing is that I'm not sure of the quality of the Skywatcher optics compared to the GS, I've not had a Newtonian.
If you are looking for an equatorial mount, the a single axis drive is really all you need. Once you're roughly polar aligned with it and manually slewed to your observing object you only need to drive on the Right Ascension axis anyway to keep the object in the field of view.
What are you aiming to do anyway Crash? Just visual astronomy or do you want to dabble a bit in photography. Dobs are great, more light for the buck, put they are push/pull scopes that require you to regularly adjust the scope by pushing and pulling it (duhh
) to keep what you're looking at in the field of view. EQ mounts use a set of gears turned either with motor or manualywith a handle connected to the gears to keep the object centered. I've not had any experience with a dob but keeping something centered with and EQ is a piece of cake.
It all depends on what your budget is and what you want to do. I hope I've helped and good luck with your choices
Clear skies
ps besides I think eq mounts look more impressive but don't tell the dob owners that
Man I can hear them screaming
now.
