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It costed as much as a new Summicron M50 2 for this conversion.
I decided to convert after owning both Summicron 50 2 and Zeiss M50 2. All three lenses are different. Sum 50 2 excels in B+W, Zeiss M50 excels in bokeh and skin rendition, G45 excels in sharpness, being sharpest of the three.
Well, I would like to add some details in my statements.
G45 2 is definitely sharper than Summicron M50 2 at f2.8 and higher up.
In the past, it was true that G45 2 was not as sharp as Summicron M50 2 at f2. As we know that G45 2 has to be put on G2 and G2 has focusing problem at f2. The conclusion of the past would be unfair to G45 as it could be due to the problem of the body.
As now I have the G45 2 converted, I will certainly let you know about the truth which is better at f2 in due course.