macro lenses

Started Apr 26, 2013 | Discussions thread
Klipsen
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It's the opposite
In reply to SteveY80, Apr 27, 2013

SteveY80 wrote:

Bjorn_L wrote:

Actually this is not the case the the lenses I think he is askng about.  I assume that he is asking about the Tamron 60mm f/2 and the Tamron 90mm f/2.8.  These have nearly the same working distance since the Tamron 60mm suffers from much less focus breathing then any other macro lens.  Meaning at 1:1 it gives nearly the same working distance as the 90mm.

I guess that makes sense considering how much the older 90mm Tamron extends when at 1:1. The newer version is internal focus though, so I'd have thought that it would have a working distance advantage.

In reality, it's the other way around. Instead of extending the lens, the focus system works halfway like a zoom, reducing the focal length to focus at shorter distances while keeping the extension unchanged.

I don't believe any SLR manufacturer reveals the actual focal length at 1:1 or other magnification ratios, but my own test shows that Minolta's 200 mm macro has its focal length reduced to a mere 105 mm at 1:1. Still, the ringflash-to-subject distance is just under 25 cm, while with my 50 mm macro it's less than 5 cm, so there's definitely still an advantage when shooting insects and spiders.

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