Why does my 24-105 have a different magnification (macro ratio) from a 105mm macro lens at same MFD?

Started 7 months ago | Questions thread
atom14
atom14 Veteran Member • Posts: 3,272
Re: Why does my 24-105 have a different magnification (macro ratio) from a 105...

Monicaa wrote:

My Panasonic 24-105 f4 has a MFD of 0.3m. It gives me a magnification of 0.5x at 105mm, which I have confirmed by taking photos of objects with a known size. This is 0.3m from the sensor plane to the object, with a working distance of about 10cm.

However, a 105mm macro lens with the same MFD (for example the Sigma 105mm 2.8 has a MFD of ~0.3m also), produces a 1.0x magnification.

How does this work? Two lenses at the same focal length and focal distance achieve different macro reproduction ratios?

I was just going to say that one's a macro lens design and the other is not.

(Maybe I should run and hide... )

atom14.

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