Tiger sniff: Leica is seen as a legendary brand in photography, unique to a number of Japanese manufacturers, and its high price puts it in a luxury position. Entering the digital age, Leica has launched a range of new products outside of the classic M-Series side-axis cameras, but is Leica really still sticking to what it calls "made in Germany"? This article comes from Weibo @ Alice-Simulans, original title < Leica Q Summilux 28x1.7 ASPH related patent introduction ", head picture source: wikimedia.
Mirror House's annual finale.
Leica is a sacred brand, as the only existing European 135 format camera manufacturer, its luxury positioning makes many photographers pay homage. Its legendary M-series range-finder rangefinder camera is a classic heritage of photography art, and its M-mount series lens is the concentration of German optics - excellent image consistency, higher limits Resolution, low dispersion, deliberately retained field curvature and continuous improvements to traditional double Gaussian structures have made them the ultimate goal for lens enthusiasts.
However, for ordinary wealthy enthusiasts, the manual operation of the M-mount is already sufficient, not to mention the yellow-eye linkage system that will run out of focus.....
In response to the crowd, Leica pioneered the X-Series of large-scale laptops in 2009, followed by an auto-focused APS-C frame-free T-Series with interchangeable lenses in 2014. These cameras have Leica's signature workmanship and German aura. To the discontent of street sweep photographers, however, their auto-focusing speed is too slow, and the sensors are not full-blown (unethical), and gradually, these APS-C frame cameras fall into vase-like existence.
Prior to this, a Japanese company released a fixed-focus full-frame portable camera in 2012. The camera is matched with the Leica Summicron 35/2 ASPH. Many photographers exclaimed: This is Modern Leica! Presumably, for the Leica deity, such a name is very uncomfortable.
Finally in the summer of 2015, Leica released a new camera, the Q Typ116, which is equipped with a newly developed full-frame photographic original and a 28mm large aperture lens with optical image stabilization. Surprisingly, the electronic part of this camera is more than ever.
Q's autofocus is very fast, and the screen display and menu response speed are not at the same level as other Leica models at the time. The straight-out color has also been significantly improved compared to the high saturation and high contrast killing style of the previous models. More importantly, this camera is only sold for about 3W.... With the above advantages, this camera is not only hot, but also squeezed the Japanese opponent out of the market with the sensor performance and final price are inferior.
Q's 28 / 1.7 lens is also very good, full-on very sharp, very low dispersion.
But people pay more attention to the lineage of the camera, from the initial distortion door to later Panasonic assembly cloud, you can search the Internet, you can get the following results:
That gives me a sense of command.
It seems Leica's secret is well known.
As a mirror house, we see that there is no exception to the Leica Q lens designed / manufactured by Comey. What's more, Leica officials have confirmed that it was designed by Comey.
So is it true?
Today the Mirror House is here to reveal the truth.
This patent application was filed on September 25, 2014, inventor Iiyama Tomoko, Masaki Masaki.
The former comes from Panasonic, a large number of mobile phone lens patents.
The latter is a well-known Mesozoic lens designer from Sony. It has developed heavy lenses including Sony A-port Sonnar 135/1.8, FE70-300G, E16-50, Zeiss Milvus 50/1.4, Leica 24-90/2.8-4. .
The following is the beauty of the late Jijun Junsheng:
(The middle is the history of the last Jiji)
Who is the patent application unit:
There are so many people who talk nonsense on the Internet, and this has nothing to do with Kemei.
Let's get to the point:
In the patent, it is believed that the size of the sensors used in compact cameras in recent years is getting larger and larger, which also leads to higher requirements for the lens. The new generation of lenses should have the ability to cope with high-pixel digital cameras.
At the same time, the portable camera has a good volume requirement, and at this time, it is required to achieve high-speed focusing and high image quality at the same time, and the conventional single IF method cannot meet the requirements.
The following is a structural diagram of the first embodiment that is closest to the raw product:
The structure is like a Biogon demonic modification, with a little bit of double Gaussian pedigree. The portable camera lens is more or less so.
It can be seen that this lens uses a focusing method similar to that of the RX1. The focus group of this lens consists of two parts - G2 and G4, which move quickly forward while focusing.
At Leica, this focusing approach is called a dual internal focusing (DSD). It is also used in Sony's new GM lens, which Sony calls a dual floating focus.
This design is quite extravagant for a laptop....
Since the lens system has two focusing lens groups, it can enhance the ability to correct the aberration of the focusing lens set in the near-focus state, so that a more compact lens system can be designed. It is convenient to correct the spherical aberration caused by focusing by providing the configuration of two pairs of focusing lenses. At the same time, detaching the focus group can reduce the weight burden of the single motor, improve the focusing speed and reduce the noise of the motor.
One of the first focusing lens group and the second focusing lens group has a diopter less than half of the diopter of the other. The aim of independent correction is that when applied to each lens group, the lens can be used to correct the bending of the image field.
The static third lens group G3 is arranged between the first pair lens group and the second pair lens group. This design can suppress the aberration fluctuation caused by two focusing lens groups in the focus from infinite focus state to close focus state.
The lens element having an aspherical surface is disposed in the second lens group G2, and the second lens group G2 is located at the closest position of the aperture stop A on the image side. With this design, it is possible to reduce the spherical aberration caused by the lens group on the side closer to the object side of the aperture stop A.
The first pair of lens sets and the second pair of lens sets are positioned closer to the image side than the aperture A. With this design, the aberrations of the upper and lower rays can be fully corrected and high performance imaging can be obtained at an infinite focus range.
The fifth lens group G5 located closest to the image side has a negative refractive power. With this setting, the back focus can be shortened, so that the total length of the lens can be reduced.
When the lens is in the macro focus mode of 0.3m-0.17m, the G1/G2/G3/G4 lens group will move forward as a whole, and the G5 will be fixed as a floating mirror group. At this point, according to the designer's mind, the aperture blades of the lens will be slightly closed for better imaging.
The fifth lens is the anti-buffeting lens group.
In terms of glass materials, the first piece of this lens is a piece of titanium flint glass S-TIL26 which is difficult to make and has a relatively brittle material. The second and third last is the ultra-high refractive flint glass TaFD33 from Hoya. In addition, a piece of anomalous dispersion material FCD515 called Sigma Black Technology Glass was used in the mirror group.
The sixth lens and the last two lenses are aspherical lenses, the last two of which are double-sided aspherical surfaces. Combined with Panasonic's advanced molding technology, the inconspicuous onion rings are also expected.
The final two lens caliber large aspheric inflection point is obvious, production difficulty is very high.
The following are aberration diagrams for infinity and 0.3m:
Distortion up to 10%
The whole is very sharp and sharp, but the edge imaging is not very good, and there is obvious astigmatism.
The area after halfway through the field is not too delicate.
In addition, the image field is not enough for the full frame....The range of the good image field marked is smaller.
The actual specification is 27 / 1.75, which is just 28 mm after correction.
The following is an aberration diagram of the macro mode of 0.3m and 0.17m:
While the camera's macro mode is more than nothing, it does work well thanks to the double floating lens group. Of course, it has something to do with the aperture.
The following is Leica's official MTF, estimate that many people have not seen it:
The edge has obvious coma.
The image of the edge of the scatter is really obvious, the following is the most corner of the screen position, when the aperture is set to f3.2:
The high-speed focus of this lens, the sharp image of the center really meets our expectations. Seeing this lens match the fuselage is really better than the RX1 set.
The center is really sharp, even sharper than the FE55. And the focal plane has almost no dispersion. (live feeling)
Central magnification screenshot:
However, the exo-bilinearity is more obvious, and people who like soft focus may be disappointed.
Compared to RX1 Sony's single-handedly, this Leica + Sony combination of Leica lenses is still a bit old.
External transmission-Leica Q's lens motor design patent:
Also for Panasonic.
You can see that the last lens is fixed on the outer lens tube.
It can be seen that two focus groups are connected to the same drive device, which is driven by two light motors and one motor is responsible for one focus group.
The following is the focus algorithm logic:
It can be seen that whether it is the fuselage or the lens, the Leica Q design is Panasonic.
This article comes from Weibo @ Alice-Simulans, original title < Leica Q Summilux 28x1.7 ASPH related patent introduction ", head picture source: wikimedia.
* The article is the independent view of the author, does not represent the position of the tiger sniffing net. This article was authored by AliceSimulans©, and was edited by Tiger Sniff. Reprint this article with the author's consent, and please attach the source (虎 sniffing net) and the link on this page. Original link: https://www.huxiu.com/article/288841.html
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