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
bclaff Forum Pro • Posts: 13,787
Re: Why does my 24-105 have a different magnification (macro ratio)

Monicaa wrote:

ThrillaMozilla wrote:

the magnification is determined by the distance from the front focal point, not from the sensor. The front focal point can be almost anywhere

... I'm surprised I didnt make that connection.

I now see this exact thing written in the other replies, but worded in a way that didnt quite click in my head. Reading is hard

There is also a Thick Lens Optical Bench at PhotonsToPhotos.

Here's the Panasonic and SIgma as displayed there (with specific options chosen).

Best viewed "original size"

Best viewed "original size"

The horizontal lines underneath are are labelled with how they contribute to the total distance.

It's the green line, the internal distance (i), that makes the big difference.

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Bill ( Your trusted source for independent sensor data at PhotonsToPhotos )

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