Sony Alpha 7R III

from Wikipedia, the free encyclopedia
Sony A7R III (α7R III, ILCE-7RM3)
Sony Alpha ILCE-7RM3 full frame camera with lens.jpeg
Type: Full-frame mirrorless system camera
Lens connection : Sony E bayonet
Image sensor : BSI - CMOS
Sensor size: Full frame (35.9 mm × 24.0 mm)
Resolution : 42.4 megapixels
Image size: 7,952 × 5,304 pixels
Pixel pitch (µm) : 4.51
Format factor : 1.0
Aspect ratio : 3: 2
File formats : JPEG , RAW (ARW)
Exposure index : 100 to 32,000 (extended 50–102,400)
Reception readiness : 1.7 s
Release delay : 0.251 s (single point AF), 0.105 s (manual focus), 0.023 s (pre-focused)
Viewfinder : Electronic viewfinder with quad VGA OLED display (1.2 million pixels)
Field of view : 100%
Enlargement: 0.78 times
Screen : foldable LCD (one axis)
Size: 7.5 cm (3.0 in)
Resolution: 360,000 pixels
Operating modes: Single image, series exposure, bracketing, self-timer , video recording
Frame rate : 10 frames / s
Number of continuous exposures: 30 (RAW), 82 (JPEG)
Auto focus (AF) : TTL
AF points: AF system with 399 point phase comparison and 425 point contrast measurement on the sensor
AF modes: Auto AF, Single AF, Continuous AF, Face Detection, Eye Tracking, Manual Focus
Exposure metering : TTL
Measuring range: Multi-field metering, center-weighted integral metering, spot metering, average metering, light metering
Regulation: automatically or manually
Correction : ± 5 EV in 1/3 or 1/2 steps
Closure : Electronically controlled, vertically running focal plane shutter , optionally fully electronic shutter ("Silent shutter")
Shutter speed : 1/8000 - 30 sec, BULB
Synchronization : 1st or 2nd shutter curtain, high-speed synchronization
Exposure compensation : ± 3 EV in 1/3 or 1/2 steps
White balance : automatically or manually
Storage media : Memory Stick Pro Duo, Pro-HG Duo and Micro (M2), SD , SDHC and SDXC (UHS-I / II compliant)
Data interface : USB 3.1 Gen 1, NFC , WLAN , Bluetooth
Video interface: HDMI (Type D), uncompressed video output
Power supply: NP-FZ100 lithium-ion battery
Casing: Magnesium alloy, plastic
Dimensions: 127 × 96 × 74 mm
Weight: 657 g (with battery and memory card)
Additions: 5-axis image stabilized sensor (5.5 f-stop gain according to CIPA standard)

The digital, mirrorless system camera housing Sony A7R III (officially α7R III , internally ILCE-7RM3 , Interchangeable Lens Camera with E-mount 7 ) belongs to the α series with full-frame image sensors, was announced on October 25, 2017 and has been in the Commercially available. It is the successor to the Sony A7R II model and, like this one, is aimed at ambitious amateurs and professional photographers. The successor model, the Sony A7R IV , appeared in July 2019 .

Changes compared to the previous model

Compared to the A7R II, many improvements have been made in detail, in particular some of the innovations of the A9 model presented in spring 2017 have been adopted. This can already be seen in the shape of the housing, which has been largely adopted. The slightly larger dimensions create space for an additional second SD memory card slot and a new, larger battery with a significantly higher charging capacity. The shape and arrangement of the rear controls have also been changed compared to the A7R II and brought closer to the A9; A mini joystick for focus point control is particularly new . The rear, foldable but not swiveling display is for the first time a touchscreen , via which the focus point can also be selected (however, it does not allow triggering or operation of the menus). The electronic viewfinder has also been improved.

Inside the camera, the same back-exposed CMOS sensor works with 42 megapixels as in the A7R II model. However, changes to the internal signal processing have further improved the dynamic range of the sensor, especially in the low ISO levels.

A significantly increased readout and processing speed should allow series recordings with 10 instead of 5 images per second (measured 6.6 images per second). The hybrid autofocus is said to have been accelerated by a strong increase in the contrast measurement points (425 instead of 25 for the A7R II model) and faster processing, and the five-axis image stabilization is said to be even more precise. With these innovations, the A7R III does not achieve the working speed of the A9, which is primarily geared towards sports photographers, but it is significantly faster than all previous mirrorless full-frame cameras from Sony. Without distance difference (1.8 Sony FE 85 mm f /) result with a fixed focal length lens in the automatic focusing distance trip delays of 0.06 seconds. With a distance difference of 8.5 meters to 1 meter, setting times of 0.43 seconds are significantly longer.

Pixel shift

A function previously not found on Sony's cameras is the A7R III's pixel shift multi-shot mode for capturing still subjects with the still camera. With this recording technique, the camera records four pictures one after the other, each offset by a sub-pixel of the Bayer matrix , which can be converted into a single picture by special software, which does not show a higher number of pixels but significantly improved picture details.

reception

While the previous model A7R II was described in reviews as a breakthrough in the field of mirrorless system cameras, many testers saw the A7R III v. a. a consistent further development with many smaller improvements that make the new model a more mature product. DPReview described the camera as a mixture of the best components of the A7R II and the A9. Despite some differences, DxOMark saw the sensor in the A7R III on par with Nikon's top-of-the-line D850 . The photographer Albert Dros rated the camera as being significantly faster and easier to use than its predecessor. Trusted Reviews saw it as “the best mirrorless camera to date” and “one of the best cameras on the market”. As of July 2018, the model, together with its sister model, the alpha 7 III, was one of the best system camera housings ever tested by Stiftung Warentest .

In August 2018, the model was recognized by the European Imaging and Sound Association (EISA) as the best professional, mirrorless system camera.

literature

  • Andreas Herrmann: Sony α7R III. The new dimension for brilliant pictures in full format. Franzis, Haar near Munich 2018, ISBN 978-3-645-60596-0 .

Web links

Commons : Photos taken with the A7R III  - collection of images, videos, and audio files

Individual evidence

  1. ↑ a b Sony A7R III Specifications. In: Imaging Resource. Retrieved July 25, 2018 .
  2. ↑ a b Sony A7R III Performance. In: Imaging Resource. Retrieved July 25, 2018 .
  3. ↑ Sony (like other manufacturers) counts the subpixels of each pixel, i. H. the red, green and blue channel (RGB) of each pixel individually, and therefore specifies the viewfinder with 1,228,800 [pixels] × 3 [color channels] = 3,686,400 pixels.
  4. ↑ Sony (like other manufacturers) counts the subpixels of each pixel, i. H. the red, green, blue and white channel ( RGBW ) of each pixel individually, and therefore specifies the rear display with 360,000 [pixels] × 4 [color channels] = 1,440,000 pixels.
  5. ↑ Sony A7R III versus Sony A7R II. In: DXOMark. DxOMark Image Labs, accessed July 25, 2018 . A similar but smaller improvement was also measured by Photons to Photos : William J. Claff: Photographic Dynamic Range versus ISO Setting. In: Photons to Photos. Retrieved July 25, 2018 .
  6. ↑ a b c Sony: Alpha 7R III + FE 85 mm , test.de from March 2, 2018, accessed on August 8, 2018
  7. ↑ Albert Dros: Sony A7RIII Pixel Shift Function Demo. Retrieved July 25, 2018 .
  8. ↑ Cameras with Pixel Shift: More precise colors and less image noise , test.de from April 11, 2018, accessed on July 26, 2018
  9. ↑ E.g. Rishi Sanyal: Opinion: Did Sony just do the impossible? In: DPReview. Retrieved July 25, 2018 . Gorden Laing: Sony Alpha A7r II review. In: Camera Labs. Retrieved July 25, 2018 .
  10. ↑ See e.g. B. Mathieu Gasquet: Sony A7R II vs A7R III - The complete comparison. In: Mirrorless Comparisons. Retrieved July 25, 2018 . Andy Westlake: Sony A7R III. In: Trusted Reviews. TI Media, accessed July 25, 2018 . Carey Rose et al. a .: Sony a7R Mark III review. In: DPReview. Retrieved July 25, 2018 .
  11. ↑ Carey Rose et al. a .: Sony a7R Mark III review: Conclusion. In: DPReview. Retrieved July 25, 2018 .
  12. ↑ Angela Nicholson: Sony A7R III sensor review: The Nikon D850 meets its mirrorless match. In: DXOMark. DxOMark Image Labs, accessed July 25, 2018 .
  13. ^ Albert Dros: First Day With The New Sony A7RIII. Retrieved July 25, 2018 .
  14. ^ Andy Westlake: Sony A7R III. In: Trusted Reviews. TI Media, accessed July 25, 2018 .
  15. ↑ test , July 2018, pages 38/39
  16. ↑ EISA PROFESSIONAL MIRRORLESS CAMERA 2018–2019 - Sony α7R III , eisa.eu, accessed on August 15, 2018