Originally Posted by mtnbearhug
Are you talking about the Kit 18-55 lens?? I can't see where mine goes any lower then 3.5... let along 1:1... Am I really being that blind????
Yes, there really are too many ratio's flying around, aren't there? That 1:3.5 on the lens refers to the maximum aperture (i.e. lens opening) of f/3.5.
Imagine if you were to remove the sensor from the camera and lay it on a table (not recommended

), and then lay something (e.g. a flower) on it, the resulting image would take up as much of the sensor as the flower did. A 1:1 macro lens imitates this process while keeping the sensor nicely tucked away in the camera, by transmitting the image to the sensor at exactly the size it is in real life.
In other words, a 1:1 macro photo of an object 10mm across will take up 10mm of the sensor.
More confused now? Sorry.