Optimust

Ok, cheers Charic. Yeah I've read that about the Barlow lens. I am a complete novice but I'm hoping I'll stick with this hobby..pretty sure I will if I can achieve good results eventually. So any advice is welcome. I've got a Skywatcher Heritage 130mm. Not bad for my price range at the minute. And how do you measure your pupil size?

Hi there, a good informative post. But as I'm new to this it looks like a lot of numbers and equations at the moment...and maths is not my forte :-) I've finally purchased a decent beginners scope which is a dobsonian f/5, now want to make sure I make the most of it by getting the right eyepieces. So if I've read it correct I would be best with a 2x Barlow, 8mm, 18mm and 25mm? I want to observe deep sky and planets. I already have a 20mm plossl through which I could see Jupiter (mostly as a bright disc) and the four moons, which last night were all in a line, it was amazing. So I don't want to ruin it by buying the wrong eyepieces. I was looking at 6mm..until I read Warthogs post. Any help is appreciated :-)