Fred Miranda wrote: Juha Kannisto wrote: bjhurley wrote: Juha Kannisto wrote:
I never had a chance to try the original first version of 28/2..
That's the one I have; here it is on my M2-R. I think they all have the same issues with extreme field curvature and crazy focus shift. On my M2-R I only use it at f2 or f8 and above to ensure accurate focus with the rangefinder. I love this lens, though!
Yes, they all have basically same optical design but it seems Miyazaki-san did some optical tweaking between each version. MS-Optics Lens 2 booklet which I have (by S. Miyazaki and S. Ishida) mentions that some improvement of sharpness and peripheral resolution was done in versions II and III over original one and the SA curves for the 3 different versions have some variation in the data sheets. In practise I think my III shows higher sharpness than my II wide open at close range at least but overall I prefer the II (especially from handling perspective).
This SA curves from Data Sheet of version III of the lens (called Part III in the sheet) show 3 different curves where leftmost is for Part I, the middle one is for Part III and the rightmost is for Part II, and these seem to refer some differences between the 3 different versions of the lens.
That’s very interesting, Juha. Thanks for sharing the datasheet for the Urushi V2...I’ll print it since I don’t have a copy. 👍 It looks like V3 (Part 3) has improved correction for spherical aberration when shot wide open.
Yes, I've also observed that my V3 does look sharper wide open at close distances at least. However, I think my V2 holds up a bit better into the corners in stopped down infinity shots.
