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Message: <blockquote data-quote="Paul Corfield" data-source="post: 1423729" data-attributes="member: 19132">Here's a simple solution to really boost the contrast with barlows. Barlows generally suffer from light scatter with varying degrees depending on the barlow make. This is easily eliminated by adding a baffle to the front of the barlow. Also insure that the internal walls of the T-mount are all matt black and if not then paint with matt black paint or line with black felt, black flock paper or something similar. Baffling the front will give any barlow an extra boost to contrast however.With my 2" GSO I've added a piece of tube to the front and into that I've inserted a rubber eye cup from an old pair of binoculars. My T-mount is all matt black inside so this boost to contrast is coming purely from the light baffle on the front. See the before and after photos, both were shot at the same shutter speed and are not altered in any way.Paul.</blockquote>