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Hi Ken
Some write that a “true” Macro Lens is one that produces a magnification of 1:1 at its closest focusing distance. That is, if an insect is say 8mm long, then when photographed at the closest point that the lens will focus, the “image” of the insect on your sensor will be 8mm long too (or on film in the olden days).
Typically, a 1:1 Macro Lens will allow you to focus as close as between 10cms – 20cms from the front lens element, slightly longer if we measure the distance to the sensor.
At a guess, a 300mm F4 lens would have a closest focus of say, 150 to 200 cms and a (de-)magnification of say, 1:4. That is, the same 8mm insect when photographed at a distance of 150cms would only appear as 2mm long on your sensor, or a ¼ of the life size.
Cheers
Dennis
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