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Message: <blockquote data-quote="Marcel" data-source="post: 65085" data-attributes="member: 3903">The drawback is that you will loose light (the longer the extension tube the more light you loose) so your 2.8 lens might become 4 even if it still reads 2.8 in the camera there will be less light getting to the sensor.You will NEVER be able to focus at infinity using any brand extension tube. Optically, there is no lens in the extension tube so it shouldn't be a problem, but… I've notice that some lenses seems to work better with them than others. Maybe it has to do with the original quality of the lenses?</blockquote>