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Message: <blockquote data-quote="Paul Corfield" data-source="post: 1793243" data-attributes="member: 19132">The easiest way is to photograph something at fairly close range with just the scope at 600mm and this gives me a base image to work from. Then put the barlow on the camera and photograph the same object from the exact same position. As long as there's an obvious target in the photo to reference it will be fine and also make sure the target is in the middle of both images. Then post both the images on here and I'll work it out. The ducks came out very well for the range.Paul.</blockquote>