I commonly use a 150mm f5.6 Rodenstock Sironar N lens on my Technika V and I find it provides very high sharpness / acutance? Not long ago, I purchased a used 210mm f5.6 Sironar N which appears cosmetically flawless. I have not conducted any meaningful tests or side by side comparisons yet, but it seems that when I look at negatives made with this lens that they lack the apparent sharpness of the 150mm. Should I expect a 210mm to look as sharp as a 150mm? Is a Rodenstock 210mm f5.6 considered to be a good performer or is there a 'preferred' lens of this focal length?
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