I want to make sure I'm on the right track here. Newbie trying to put together some EPs for the AD8 my brother and I are getting delivered tomorrow. After reading through several topics, we've decided to go the route of getting a SVBONY 7-21 zoom (already received) and a Barlow, in addition with the 9mm plossl and the 30mm 68 degree super view that come with the scope. Being that we are complete amateurs , I'm trying to take the advice of not going overboard on EPs to begin. Hence the decision on the zoom, aware of the trade offs in tfov and all. Seems like a decent place to start. But I don't want to cheap out where we should not. So I'm wondering if we should be considering going with a higher quality barlow now, or if that is inefficient..
First of all, we have a 2" focuser on the AD8. Originally I thought that meant we should most certainly be getting a 2" barlow. But I did read an article Ed Anderson has linked in many other threads on choosing a barlow, and am beginning to think that we should be going for a 1.25. Reason being that if we can get one that has a removable element, we can magnify every focal length of the SVBony zoom at 1.5x and 2x, right? Because with a 2" barlow the removable element is at 2" dia?
And second, https://telescopicwa...ens-and-how-to/ this was the link listed. Now the GSO shorty 1.5x/2x is the only Barlow listed here that has the removable element if I understand correctly. Anyone have experience with it, and/or a mid-higher range option? If we find ourselves in the future with a ton of higher quality single fl EPs, will a Barlow as cheap as this GSO shorty hinder the quality of our EPs? Because if so then I don't see a reason to grab an entry level piece , ya know?