Virtual is justice! Evaluation of Sony G main lens Fe135mm f1.8gm.

IT 168 commented that portrait shooting and large aperture have always been inseparable, and the focal length of 85- 135mm has always been called the golden focal length of portrait photography. The main reason is that the shooting effect of this focal segment has a strong perspective, no obvious deformation, and the blurring effect of the background is well controlled, which is very suitable for portrait shooting. However, it may be that 85mm is deeply rooted in the hearts of the people, and various manufacturers have not made much effort on the focal length of135 mm.

Now, on February 26th, 2009, Sony officially released the ninth lens of the Master G series-Fe135mm f1.8gm, which is also the last large-aperture fixed-focus lens after the 50mm and 85mm focal lengths of The Legend of Three Heroes. This shot attracted many people's attention as soon as it was released. As a new generation of portrait mirror emperor of Sony G master series lens, what good performance does it have? Let's get to know it through evaluation.

Product appearance

From the appearance, this FE 135mm F 1.8GM lens is not large, and the weight of the lens body is about 950g, so it is still very safe to hold in your hand. As an original lens, it is quite competitive.

The lens housing of FE 135mm F 1.8 GM is still pure black. Choosing magnesium alloy as the material can effectively reduce the weight, and the length of the lens body is also controlled at127 mm. As a member of the fixed-focus lens, the design of aperture ring and focus ring is very helpful for video shooting. The black leather treatment of the focus ring and the metal material of the aperture ring maintain the consistent unified style of the G Master series lenses. In addition, the design of the mirror body is also very reasonable. A relatively spacious space is reserved between the focusing ring and the aperture ring, which makes it easier to hold and lightly hold the mirror body. The two-handed operation does not affect each other, and the shooting process is more worry-free.

Aperture ring range F 1.8-F22

AF/MF switching and focal length limiter

Stepless smooth adjustable aperture mode switch button

The aperture ring ranges from F 1.8-F22. In addition to manually adjusting the aperture, it can also be adjusted to the first gear, which is controlled by the fuselage. The two methods are suitable for different users' habits. There are also two function buttons on the side of the mirror, including AF/MF switching and focusing distance limiter, which can improve the focusing speed according to the required shooting distance. In addition, it is specially equipped with a stepless smooth adjustable aperture mode switch button for video shooting, which is very practical.

Focus lock button

There is a focus lock button at the front of the FE 135mm F 1.8 GM lens, which can not only lock the focus, but also set new functions through the body custom menu, making it more professional. The rear bayonet is made of metal and equipped with dust-proof sealing ring. The lens filter is 82mm in diameter, which is still relatively large. Using Sony's unique nano anti-reflection film technology can effectively reduce glare and ghost, thus further improving the resolution. The coating is light green.

The overall appearance of the lens is very harmonious with the A7RM3 micro camera. Although the lens is not equipped with anti-shake function, it is guaranteed to focus on the performance of image quality. So what is the shooting performance of Sony G main lens FE 135mm F 1.8GM? Let's take a comprehensive look at the quality of this new lens through testing.

Performance analysis and testing

Optical structure

The lens structure of FE 135mm F 1.8 GM is 10 group 13 lens, with innovative optical design, including 1 XA (super aspheric) lens and 1 Super ED (ultra-low dispersion) lens. XA lens can effectively control distortion and coma, and ED can reduce dispersion and improve sharpness.

Modulation transfer function

According to the MTF curve provided by Sony, the lens of FE 135mm F 1.8 GM maintains high resolution in the whole aperture range, with excellent overall sharpness and high intermediate sharpness. Although the edge sharpness has decreased, the gap is not big and the overall curve is stable and good. Next, we pass the test to see how it performs in actual use.

Sharpness test

original drawing

F 1.8

F2.8

Tetralogy of Fallot

F5.6

F8

F 1 1

F 16

F22

Sony A7R3 camera is used in the test. First, the noise reduction function of the camera is turned off, and the performance of the center and edge position of the original image under different apertures is observed. Through the test, we can feel that the basic and official MTF curves are consistent. Under the large aperture of F 1.8, the sharpness and clarity of the center and edge can be basically maintained. At the beginning of F2.0, the overall sharpness can be obviously improved, while the sharpness of the center and the edge can basically remain the same in the range of F2.8-F 16, and the sharpness starts to decrease obviously from F 16, and the effect is more obvious in F22. Generally speaking, FE 135mm F 1.8 GM has good image quality at the lens edge and center, and the picture is clear, up to F 16 aperture range, so it can be used safely.

Distortion test

Distortion is lens distortion, especially when shooting linear objects. If the lens is deformed, it will distort the straight line. Relatively speaking, the medium telephoto lens is unlikely to have obvious deformation. According to the above test, the lens distortion control of FE 135mm F 1.8 GM has no obvious barrel distortion even if the optimization option in the machine is turned off.

Dark angle test

Dark corner is actually light loss, which is caused by incident light. Generally, they mainly appear in the four corners of the picture, which is more likely to appear in large aperture lenses. According to the test, the lens of FE 135mm F 1.8 GM has obvious dark angle in the range of the maximum aperture F 1.8 to F2.8, but when the aperture value reaches F4, it starts to improve obviously, and F5.6 is almost completely invisible.

Dispersion test

F 1.8

Second generation

F2.8

Generally speaking, a large aperture fixed-focus lens is prone to chromatic dispersion (purple edge, blue edge and green edge) in a large light ratio environment. From the test, the lens dispersion control of FE 135mm F 1.8 GM is quite good, and there is no obvious purple edge phenomenon at the highlight of the maximum aperture F 1.8.

Background fuzzy test

This Fe135 MF1.8 GM has outstanding background blurring ability. In this way, the purpose of avoiding the influence of messy background on the prominent subject is achieved. Next, we know its fuzzy ability through testing.

As shown in the above figure, the closest focusing distance of FE 135mm F 1.8 GM is 0.7m, where the blur effect is the most prominent under the F 1.8 aperture, which can highlight the main body of the photo more. The Jiao Wai is very soft, and the blur effect of the background can better set off the hazy and soft feeling of the whole picture. The blur effect under aperture F2.8 is good, which is also the biggest product feature of this FE 135mm F 1.8 GM lens. Because of its excellent Jiao Wai blur effect, it is very suitable for taking portraits.

Sample appreciation

So what kind of performance will this Sony G main lens FE 135mm F 1.8GM have in portrait photography? Let's feel it through the following samples.

Let's start with the basics. We used the combination of FE 135mm F 1.8GM lens and Sony A7RM3 camera to shoot the proofs, and shot on the basis of ensuring high quality. Through the above proofs, using the large aperture of F 135 mm F 1.8 GM lens can highlight the main body of the characters well, and at the same time, it can artistically present the blur effect of the background, even if the background environment is messy, it can blur the effect of using the large aperture. At the same time, because the lens has four XD linear focusing motors built in, the feeling of focusing during real shooting is very fast and stable. The combination of the new focusing module and Sony Micro-Single's face/eye recognition technology also makes the details of people appear in place and the color reproduction is high.

Evaluation summary

Generally speaking, the lens clarity of FE 135mm F 1.8GM and the background blur effect including the out-of-focus are beyond imagination. However, as a portrait lens, it does not have anti-shake function, so its shooting flexibility is slightly limited when shooting some specific themes. So what kind of person is it suitable for? If you need excellent Jiao Wai blur quality, high image quality at the maximum aperture and high full-open sharpness, then this Sony FE 135mm F 1.8GM lens will definitely meet your needs.