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Fair enough Raymo. The point I was trying to make is that each piece of glass reduces the overall light transmission slightly, it may only be slight but every photon is precious!
Apart from that I was relaying my own experience using good quality barlows. The image was always superior if I used a stand alone EP giving the same power. I had a 24mm Pan and if I barlowed that the image was noticeably more "mushy" than I had with a 13mm Nag. I know the powers are not exact but close enough. Same went for barlowing the 13mm nag against a stand alone 7mm nag.
If I was restricted to using plossls with horrid eye relief and tiny exit pupils at high powers, then yes a barlow can make sense, but stand alone EPs have worked when talking better quality EPs.
Malcolm
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