Originally Posted by
Policar
Just based on mtf charts, the N is extremely close to the S (up until the edges, where it falls off) and superior to even the Apo-Symmar-L. But different manufacturers measure mtf differently, so...
Anyhow, I have a 135mm and 180mm sironar-s and can confirm they are sharp and have awesome color rendering with almost no secondary chromatic aberration. At normal f-stops I can't imagine the difference in sharpness is significant, though. I doubt I'll spend the extra money when I get a long lens, but only because long lenses are more expensive and even the worst large format lenses are fairly good in my experience.
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