Hello Nick,
I have a Pulsar observatory too, as you can see in the photo on the left! I also get some condensation on the inside of the dome, but only really when I am out there using it. I haven’t done anything about it as it has usually gone by the next day. No detrimental effects after 12 years. I have thought about a dehumidifier, like Andy uses, but I fear the electricity bill – there is quite a large airflow through/around the dome.
All the best,
Jeremy