Hello John; I am a Spanish fan and I have joined this forum to learn. I intend to purchase a planetary specific eyepiece and I have been reading reviews of the Vixen SLVs and I would like to use them with the X2 and X3 Explorer Barlom Teleextender to have a wider X play with them. Currently I have in my possession the entire series of the scientific explorer of 82º 4.7mm, 6.7mm 8.8mm 11mm 14mm 18mm 24mm and 30mm. But I want to have a specific planetary eyepiece to get something more in definition and contrast. My telescope is 16 "F4.5. My question is; Is there a problem using it with the explorer X2 and X3 barloms teleextender? Do these eyepieces work well with barlom? I guess they work better than getting a longer focal length. Greetings and thanks. J.Tapioles