This lens is quite soft at large apeature. A wide open, it's really like a soft-lens, which gives a very interesting effect. A friend told me that this lens is designed to behave like that, but I cannot confirm if this is really the design intention or not.
@f/11:
The lens starts to give reasonable sharp image at f/8 or smaller apeature. Even at small apeature, the bokeh is very nice thanks to the 18-blade apeature structure. Having said that, don't expect the sharpness of this lens is comparable to that of the modern lens - it's 'enough' sharp, but it's not razor-sharp.
Color-wise, the lens is a little pale and cool-tone. Will post some sample to exhibit these color characteristic when I can find some.
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