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Anything added to the light path will degrade the image. Its just a matter of what is visible and acceptable.
A barlow adds extra elements and air/glass surfaces to scatter light. To minimise this effect make sure you get a quality one.
The words "fully multicoated" carry both a price and a performance premium in this regard.
Last edited by Starkler; 28-03-2005 at 12:31 PM.
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