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Message: <blockquote data-quote="WeeHector" data-source="post: 365414" data-attributes="member: 14301">I've been using macro tubes with various lenses for over a year now and it is quite difficult to explain how it works to someone who has never tried it. When I got my 12,20 and 36mm ETs I tried them all together with a lens and everything was totally blurred. Why? Because when you are doing macro with ETs you have to think back-to-front. I'll give the example of my 18-55mm lens mounted on a 36mm ET.Now we know that a photo at 18mm seems much further away than one at 55mm because of the angle of view. Add a 36mm extension tube and you totally change things around. The ratio between the focal length of the lens and the ET comes into play. At 55mm you can take a photo of an insect at, let's say, 2 inches. At 34mm you are virtually touching the subject but, with correct angles, you have just enough light to take a photo. Take the lens down to less than 34mm and you are touching whatever the insect is sitting on and there is no light available to take the shot. The closer the focal lengths of the lens and the tube approach one another, the closer you have to get to the subject to focus on it and the less light you have available.Therefore, the idea of fitting a TC onto a lens and mounting it on an ET is simply defeating the object of the exercise as this is increasing the ratio between the lens and the extension tube. You can focus from further away but the subject will be much smaller. As to what a lens mounted on an ET added to a TC on the camera would give I hate to think but I would probably accept that it would be totally unusable as a set-up.</blockquote>

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