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Depends entirely on the quality of the barlow you use. In a poor quality barlow the image will be degraded with a loss in contrast, sharpness and light transmission. With a good barlow you wont see any difference. FWIW if you use a top grade barlow the TV plossl will outperform the ED-2 in terms of lunar/planetary performance IMO. I have never compared them side by side but used them both independantly.
CS-John B
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