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
ThrillaMozilla Veteran Member • Posts: 7,491
Re: Why does my 24-105 have a different magnification (macro ratio)

bclaff wrote:

ThrillaMozilla wrote:

...

Now here's the hard part. It sounds like you want to know the working distance, which is simply unknown at this point. That depends not only on how thick the lens is (which Bill Claff can help with), but also on how much metal and plastic is on the front side of the lens at maximum magnification. Even something as simple as a lens hood or a filter would change the working distance.

...

Distance to the front lens vertex is provided in my previous Optical Bench screen shots.

Panasonic Lumix S 24-105mm F4 Macro OIS 117.41mm
Sigma Macro 105mm F2.8 EX DG OS HSM 144.49mm

These values are also not intuitive as you might think the close working distance would be the higher magnification.

Excellent.  Now, for a fair comparison of the two lenses, the working distance at a magnification of 0.5 would be the pertinent value.

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