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Sigma 150mm f2.8 Apo Macro OS in-depth review.

150 Macro review Macrophotography Sigma lenses

I have tried the new Sigma 150mm f 2.8 Apo Macro OS, a lens with excellent reputation not only among macro photographers, but also among portrait shooters. How does it rank against legendary lenses like the Nikon 200mm f4 micro-nikkor AfD? Read on.

 

Actual focal length.
 
As typical for IF lenses actual and nominal focal lenght equal each other only at distances close to infinity; in the macro area the reduction of the actual focal lenght is consistent, and this leads to short focusing distances. A problem if you want to shoot at lively critters, that may flee or, on the contrary, attack you. 
I have compared the variations of the actual focal lengths between the 200 micro-nikkor AfD and  the 150 Sigma OS:
 
 

At RR of 1:5, the 200 micro actual focal length is  180mm, that of the 150 Sigma is 138mm. 
 
At RR of 1:3 the  200 micro hactual focal length is 169mm, that of the  150 Sigma is 113mm.
 
At RR of 1:2 the  200 micro actual focal length is 155mm, that of the 150 Sigma is 111mm.
 
At RR of 1:1 the  200 micro actual focal length is 125mm, that of the 150 Sigma is 93mm.
 
 
 

At the  RR of 1:5 the 200 micro focuses at  130cm, the 150 Sigma at 100cm.
 
At the RR of  1:3 the 200 micro focuses at  90cm, the  150 Sigma at 60cm.
 
At the RR of  1:2 the  200 micro focuses at 70cm, the  150 Sigma at 50cm. 
 
At the RR of 1:1 the  200 micro mfocuses at 50cm, the  150 Sigma at 38cm.
 
 
Summarizing with graphs:
 
 

Immagine Allegata: fceff.jpg

 

Actual focal length vs reproduction ratio (abscissa).

 

 

 

Immagine Allegata: disrr.jpg

 

Subject distance vs reproduction ratio (abscissa)

 





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