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ok, first off, you have had a really good start veiwing all of those objects in a few weeks. Well done. I have a limited understanding myself but I will try and help. I dont know what the different types of barlows mean. I know from what others have told me on this forum that if you buy a QUALITY barlow there should be no difference in the view you get with using a shorter focal length eyepiece. spend about $150 or you will be doing more harm than good. TV barlows are about this much. You mentioned that you have a 10mm plossl, is that the only ep you have? If so, I would be on the lookout for something that is lowest power you can get in 1.25" and a 2x barlow. You can then use this on your 10mm as well. a lot of people on this forum dont use barlows but the fact remains that if you have a limited budget, a barlow can double your arsenal. If you dont have a limited budget, by all means go and buy a Tv/pentax/vixen/ES in every focal length. Hope this helps
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