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Message: <blockquote data-quote="Clovishound" data-source="post: 843015" data-attributes="member: 50197">Extension tubes instead of diopters. Extension tubes have no glass elements to degrade your image. They are cheaper as well. The only down side is that you will need longer tubes for 105 than for say a 50mm lens in order to get the same amount of magnification. You will lose a little bit of light, but not significant, unless you go extreme on the length. Make sure you get the ones with electrical contacts to transmit info from the lens to camera and visa versa. Unless you are using a very old model, there is no aperture ring on the lens. What kind of magnification are you looking for? You are starting at 1:1 the the 105.</blockquote>