Sony α7II hardware biggest highlight is the fuselage built 5-axis sensor shift image stabilization. 5-axis image stabilization mentioned we naturally think of Olympus, plus the 2012 Sony became the largest shareholder in Olympus, which had reminiscent of Sony’s 5-axis image stabilization technology from Olympus. Sony side was given a clear response independently developed by Sony.
On the surface, Sony is equipped with a full-frame in a compact body 5-axis image stabilization system, the difficulty is indeed higher than the M4 / 3 system, the biggest problem is space constraints, M4 / 3 sensor size is small and the card system mouth large, and E-mount full-frame system contrary, E bayonet itself carries a full frame can say just good, plus the body size to be controlled, Sony need to address the magnitude of compensation, heat sensors, components, power, edge imaging and other issues, so even if the work on the same principle, Sony can not simply be a larger version used directly.
Then work on the same principle, Sony and Olympus it? It is learned that some of the content on α7II axis image stabilization, Sony engineers from there. Sony and Olympus cooperation still only in the medical field. Sony’s 5-axis image stabilization system is a new research and development. Olympus 5-axis image stabilization system consists of a spring and a magnet. For a full frame (24 × 36mm) sensor, the spring mechanism is too cumbersome and not strong enough to compensate for lack of precision. In addition, the mechanical spring growth over time will lose elasticity. In order to replace the mechanical spring mechanism, Sony chose the torque coil / magnet to solve the mechanical problem of aging and accurate compensation. Sony’s image stabilization system compared to spring system with higher energy efficiency, less battery power. In addition, Sony also made a muted, image stabilization system work process is no obvious hiss.
The image sensor is mounted on a movable carriage lightweight magnesium alloy. As a ball bearing system, motion more smoothly. The design is derived from the seismic structure of Japanese architecture.
As for the direction of the anti-shake compensation, Sony’s 5-axis image stabilization system similar to Olympus, can target displacement (X, Y), swing (Yaw, Pitch), and rotation (Roll), such as to compensate for jitter. You can compensate for its highest shutter speed of about 4.5. This condition is the highest compensation effect: according to CIPA standards, only swing to compensate for jitter, installation Sonnar T * FE 55mm F1.8 ZA, and the long exposure noise reduction turned off.
5-axis image stabilization provides excellent anti-shake performance telephoto lens depending on the subject matter, it is easy to produce jitter swing, swing (Yaw, Pitch) image stabilization can be compensated; displacement (X, Y) image stabilization, you can jitter is compensated for displacement generated when macro photography; when rotated (Roll) video and image stabilization can low light conditions, using a slow shutter speed architecture, landscape and other subjects shooting, rotating shift generated to compensate. Here we look at the actual results of the anti-shake system, we use the 35mm end Vario-Tessar T * FE 16-35mm F4 ZA OSS to shoot:
Performance is acceptable from the point of view real shot image stabilization effect, basically stick to 1 / 5s, while the test results can not all be attributed to body image stabilization, after all, this lens is equipped with the OSS, the lens image stabilization can not be excluded help.
When installed α7II support OSS E-mount lens image stabilization, the lens is responsible for swing (Pitch, Yaw) image stabilization, α7II is responsible for the displacement (X, Y) and rotation (Roll) image stabilization; As mentioned test, OSS Lens themselves also play a role in anti-shake mechanism, the machine settings and there is no specific anti-shake to body or lens, either fully open or fully closed. About lens image stabilization and body image stabilization, in M4 / 3 system, the main lens image stabilization Panasonic, Olympus main body image stabilization, if equipped Olympus Panasonic image stabilization lens, only use one side. Sony is now a do, you can do both work together. Then the future will reduce the introduction of Sony’s image stabilization lens? In fact Sony body image stabilization, not a negative lens image stabilization, you can see from Sony’s remarks on the swing lens image stabilization (Pitch, Yaw) image stabilization still have an advantage. After α7II compact body can play a limited scope for the future if applied to a single motor body, believe that we can give full play to its performance.
When installing a non-OSS E-mount lens image stabilization, or when the LA-EA4 A bayonet mount lenses via adapter, by α7II responsible for image stabilization in all directions (part of the lens only supports 3-axis image stabilization). In addition, 5-axis image stabilization technology also provides support for third-party lens, that can not pass on information to the body of some shots, the user can set the lens focal length (8-1000mm) in the body of the manual to get the anti-shake compensation. For no electronic contact lens part of third-party support only 3-axis stabilization, and even individual conversion lens, body image stabilization can not be turned to gray. Edit user should feel adapter to experience the real machine shop experience, to confirm whether or not to support anti-shake.
In addition to the anti-shake system, on α7II CMOS sensor uses anti-reflective coating (with α7R, α7S), can improve the appearance of a halo when shooting point source problem.
Sony α7, α7R, α7S body design basically the same, but differ on the material, but α7II body with a new design, the whole body of the coat change, no longer smooth but with a single power similar sandblasted coating fuselage, the fuselage handle more lordosis, narrowing spire on top of the fuselage.
α7II body uses more magnesium alloy, and α7R, same α7S, the top of the fuselage, the front part of the internal structure and the button with a lightweight magnesium alloy, high strength. Notably α7 board front opening for the plastic material, is now replaced by a metal material, better bayonet strength and stability. In addition, the body and the operation buttons are also equipped with a sealed structure, the ability to dust and drip-proof, and can meet the needs of high-end photography enthusiasts.
Volume, due to the built-in 5-axis image stabilization body, compared with the α7 α7II width remains unchanged but has a certain height and thickness increase, especially the increase in the thickness of 1cm, and makes the body appear shoulder slope, the volume increase and join the anti-shake component, so that the body weight improved significantly, reaching 556g.
Details of the design, α7II body with a new design. The biggest change is part of a handle and shoulder compared with α7. α7II handle more protruding notch deeper, and in front of a concave design, significantly improved grip handle, especially when equipped with a telephoto lens, hold for a long time will not feel difficult. Due to handle more lordosis, shutter and power switch moved to the front bevel handle, front dial in the front of the handle. The overall design is similar to the handle and single-camera.
Another big change is at the top of the fuselage, due to narrowing spire, larger space left shoulder, right shoulder due to the shutter / power switch on the handle moved, the place vacated increased C2 custom button (default: Focus settings ). Such a definition from the reach of the four buttons.