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

Started Jul 28, 2022 | Questions thread
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Monicaa
Monicaa Junior Member • Posts: 44
Why does my 24-105 have a different magnification (macro ratio) from a 105mm macro lens at same MFD?
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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?

 Monicaa's gear list:Monicaa's gear list
Fujifilm X-E3 Panasonic Lumix DC-S5 Panasonic S 24-105mm F4 Macro OIS Sigma 105mm F2.8 DG DN Macro Sigma 35mm F2 DG DN
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