by Jakub

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As agf1997 says, minimum focus distance for macro lenses varies somewhat with lens design, however as a rule of thumb you can expect the minimum focus distance (i.e. minimum working distance) to be roughly the same as the focal length of the lens (assuming 1:1 magnification here). Hence a 300mm lens with a whole lot of extension tubes (as a silly example to ...


When a macro lens has a reproduction ratio of 1:1 an object with a given size will be reproduced at the image plane at the same size. This is irrespective of the focal length. The only difference is that a longer focal length will afford you the ability to achieve that reproduction ratio at a greater distance than the shorter focal length. The precise ...

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