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Message: <blockquote data-quote="Paul Corfield" data-source="post: 1673459" data-attributes="member: 19132">Well this is where camera gear just gets pointlessly expensive. The Kenko ones are a series of separate tubes each with their own bayonet fitting so it's very quick to link them together or take them apart. They also relay camera information back to the camera via electronic connections so you can still auto focus, take meter reading etc. The cheap ones don't relay any information to the camera and don't allow auto focusing etc. Plus because they only screw together they take much longer to to take apart, change the length by removing or adding a section which has to be screwed/unscrewed and then screw the bayonet back on. I've got a couple of sets of the cheap ones and they are ok as long as you don't mind the points I made. For digiscoping they are fine because you only really need them as a sort of extension between the camera and the barlow.Paul.</blockquote>