Summicron-M 90/2 (1980) vs Summicron-R 90/2 about bokeh

[Shepherdphotographer]

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Good morning, I'm sorry if my English is not good, first of all. I am writing to ask you for an opinion, preferably deriving from personal experience. I own and use many Leitz lenses (Leica R), modified in the bayonet, on Nikon D810: among these the Summilux-R 80 / 1.4 and the Summicron-R 90/2. I am thinking of buying a mirrorless, which would allow me to use, among other things, also the Leica M lenses. In particular, the first one I would like to buy would be the Summucron-M 90/2 from 1980, but, even if I know a lot, Leica R lenses very well, I don't know Leica M lenses. I thought I'd read up, looking in Putt's Compendium, where people write mainly about sharpness, an aspect that interests me very little. In fact, I appreciate the blur (first of all), the color rendering, the tonal passages, the delicacy. I was very surprised by observing photos found on the internet taken with the Summicron-M 90/2 of 1980. It has 15 blades, against the 8 of the Summicron-R 90/2, which at the widest apertures is dreamlike and for this rendering, this feature , I'm in love with it, but the question is this: is the character, the personality of the Summicron-M 90/2 the same as the 90/2 R? The blur should be even more beautiful, soft, considering the 15 blades, against the 8, right? On a mirrorless (non-Leica), would the Summicron-R 90/2 lose quality, having been designed for analog rangefinder Leica? I thank everyone in advance. I hope you are available to help a neophyte who is now approaching the world of Leica M and who only knows the Leica R well.

[UliWer]

19 minutes ago, Shepherdphotographer said:

I was very surprised by observing photos found on the internet taken with the Summicron-M 90/2 of 1980. It has 15 blades, against the 8 of the Summicron-R 90/2,

I am sure, the 90mm Summicron-M from 1980 does not have 15 blades. The version from 1960  and earlier had 15, the next version from 1963 had only 12. The version from 1980 had a new optical and mount design. The Leica Wiki says it has 11 blades: https://www.l-camera-forum.com/leica-wiki.en/index.php/90mm_f/2_Summicron-M_III

[Shepherdphotographer]

4 minutes ago, UliWer said:

I am sure, the 90mm Summicron-M from 1980 does not have 15 blades. The version from 1960  and earlier had 15, the next version from 1963 had only 12. The version from 1980 had a new optical and mount design. The Leica Wiki says it has 11 blades: https://www.l-camera-forum.com/leica-wiki.en/index.php/90mm_f/2_Summicron-M_III

Ah, ok......, I haven't read right...... Can you help me for my quesiton, my future choice, please?

Edited November 4, 2021 by Shepherdphotographer

[wwak]

11blades is correct.I have counted them.

[Shepherdphotographer]

36 minutes ago, wwak said:

11blades is correct.I have counted them.

Excuse me, I've read on a not serious site about blades and only comments  from Puts.

 

[frame-it]

1 hour ago, UliWer said:

I am sure, the 90mm Summicron-M from 1980 does not have 15 blades. The version from 1960  and earlier had 15, the next version from 1963 had only 12. The version from 1980 had a new optical and mount design. The Leica Wiki says it has 11 blades: https://www.l-camera-forum.com/leica-wiki.en/index.php/90mm_f/2_Summicron-M_III

i have the 12 blade silver Canadian  version..delicious bokeh

here on Fuji GFX50R + https://www.l-camera-forum.com/leica-wiki.en/index.php/Summicron_(II)_f%3D_9_cm_1:2

 

 

 

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[Shepherdphotographer]

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Thank you for your precious contents. About a comparison between 90Cron R and 90Cron M (1980)?

[Shepherdphotographer]

Silence.....

[evikne]

On 11/4/2021 at 12:44 PM, Shepherdphotographer said:

The blur should be even more beautiful, soft, considering the 15 blades, against the 8, right?

The number of aperture blades has no visible impact on the bokeh, except for the shape of the OOF highlights (AKA "bokeh balls"). 

[Shepherdphotographer]

6 minutes ago, evikne said:

The number of aperture blades has no visible impact on the bokeh, except for the shape of the OOF highlights (AKA "bokeh balls"). 

Are you sure, excuse me? I thought for both .....

Edited November 5, 2021 by Shepherdphotographer

[evikne]

31 minutes ago, Shepherdphotographer said:

Are you sure, excuse me? I thought for both .....

I think the bokeh quality (softness of the background blur) depends more on how well spherical aberrations are corrected, but I'm sure someone else can explain it better than me.

Edited November 5, 2021 by evikne

[Capuccino-Muffin]

39 minutes ago, evikne said:

The number of aperture blades has no visible impact on the bokeh, except for the shape of the OOF highlights (AKA "bokeh balls"). 

It has an impact on star effect, wether the blades are an even vs uneven number

[Shepherdphotographer]

However, in your experience, are there substantial differences in character between the two lenses under discussion? Thank you in advance!

[Shepherdphotographer]

Thank you for your precious contents. About a comparison between 90Cron R and 90Cron M (1980)?

[Shepherdphotographer]

Therefore, isn't it true that if the number of blades increases, the softness of the blur also increases, in your opinion?  In any case, someone with direct experience using both Summicron-R 90/2 and Summicron-M 90/2 would be kind enough to express his impressions of which of the two produces a softer blur?  Thanks!

Edited November 6, 2021 by Shepherdphotographer