Optical Diagram of the Nokton 50mm f1.1

[P. Lynn Miller]

Mr. Sweeney was asking about the optical formula of the new Nokton 50mm f1.1...

Well, here is a small diagram of the Nokton 50/1.1 among other CV lenses...

From looking at the illustration, there appears to be seven elements, not sure how many groups. From the other diagrams of the other lenses, there does not appear to be an aspherical elements in the new Nokton, as there are no 'blue' elements in the 50/1.1 diagram. There seems to be a trend away from aspherical elements in all the new optical formulas by Cosina.

So what do you think, Mr. Sweeney?

 

[chris00nj]

Interesting, thanks for posting

 

[maddoc]

Identical to the Noctilux 50/1:1.0.

 

[P. Lynn Miller]

A few other bits of details I gleaned from trawling the Japanese CV site(thank you, Google Translations)...

Focal length / 50mm
Aperture ratio / 1:1
Minimum Aperture / F16
angle 6 of 7 copies / 45.9 °
Number of diaphragm blades /
Minimum focusing distance of 10 copies / 1m
Integration range in range / ∞ ~ 1m
Maximum total diameter × length / φ69.6 × 57.2mm
Filter size / φ58
Weight / 428g
Mount / VM
Retail Price (without tax) ¥ 125,000

Some of the above is obvious, some not important, and some good to know.

Interesting that the 50/1.1 is lighter than the 35/1.2 - 428grs vs 490grs - and is 'fatter' while being shorter - 69.6mm vs. 63mm and 57.2mm vs 77.8mm - and the suggested retail price is cheaper - ¥125,000 vs. ¥135,000!

It will be very interesting to see how that last fact works out in real life! That the Nokton 50/1.1 could be the same price as the Nokton 35/1.2.

 

[Cron]

very interesting, thanks for posting!
Kind Regards

 

[SamC]

Interesting info, thanks for posting. Will definitely get one if priced right.

 

[David Murphy]

Groups are really a dated concept. In modern ray tracing programs that optimize lens designs, the parameters of all optical elements are generally varied simultaneously so that all elements couple. Even classic design concepts: Tessar, Sonnar, Biotar, Planar, or whatever are really no more than starting points for a unique design ultimately arrived at by the computer.

 

[P. Lynn Miller]

Identical to the Noctilux 50/1:1.0.

Hmmm... the first variation of the f1.0 Noctilux also took a 58mm filter. Could it be a blatant rip-off? I don't have the tech papers for the Noctilux f1.0.

I think it is interesting that it appears that Cosina designed this lens using all spherical elements. I am waiting to hear some of the local resident optical experts opinion on all this diagram.

Edit:

I found the details of both the f1.0 and f0.95 Noctilux on Erwin Putz in this article -

Leica Noctilux-M 50mm f0.95 ASPH. , part 1

And there are a lot of similarities.

 

[maddoc]

I just downloaded the "Leica M-Objektive - Ihre Seele & Geheimnisse_de.pdf" (German version) from the homepage of Leica Camera AG. It contains a schematically drawing of the Noctilux 50/1.0 (and of most of the other Leica lenses) together with MTF charts.

As I remember, the optical formula of the Noctilux wasn't changed when going from the E58 version to both E60 versions, just the mount and coatings were improved, but I might be wrong of course.

Having a optical drawing as a starting point, some experience in optical design (to find solutions for correcting optical design flaws), and some very good optical designing software + powerful computers it should not be rocket science to design a fast 50mm lens ...

 

[P. Lynn Miller]

Gabor,

Thanks for that reference.

Here is a direct link and the Noctilux f1.0 is on page 54 of the document...

Leica M Objektive

Thanks,

 

[nzeeman]

i dont think that is a rip off - 6th element have inverted curvature compared to noctilux. also canon fd 50/1.4 have design a bit like that too.

it is from the www.imx.nl/photo/ optics/optics/page81.html

 

[Sonnar Brian]

Seven Elements in Six Groups- I'm surprised not to see the aspherical surfaces. They must feel good with their glass. I love those two rear elements- Very Summarit.

Okay, we need a swirly Bokeh test.

 

[ferider]

Brace yourself. It will shift on the M8 ...

Looks like a great lens with character.

 

[JoeV]

Any idea if this new lens is telecentric? I'm thinking adapted to a G1, of course!

~Joe