Originally Posted by
Bob Salomon - HP Marketing
The S as noted covers a larger circle, it is optimized for 1:10 rather then 1:20, i is superior to the N at both table top range (1:5) and at infinity,it uses ED glass, it has a wider range of optimal apertures. It is generally a better overall performer then the Apo Sironar N. in addition, if your lens is not marked MC then the S, as well as the Apo Sironar N, will have greater contrast and apparent sharpness and be far less vulnerable to problems created by light hitting the front element. The MC drastically reduces light reflections off the glass and improves shadow detail in those situations.
The S is also sharper at the edges of the circle.
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