Sigma 150mm macro + EX-25, how much maginification?

Started May 9, 2011 | Discussions thread
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msusic
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Sigma 150mm macro + EX-25, how much maginification?
May 9, 2011

Does this combo even work (AF is irrelevant)?

According to Sigma, it's a 1:1 lens on a 35mm, meaning it would become a 2:1 equivalent lens on FT and would adding a EX25 make it into a 4:1 or something shorter like 3:1?

I ask this because 50mm + ex25 turns out to be 1:1 (or 2:1 in 35mm comparison) and ex25 gives 2x more magnification (closer working distance), but I'm not sure if this applies to Sigma 150mm.
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Marin

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