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Sony a7R IV


  • 61mp full frame camera with IBIS
  • announced July 2019, coming Sept 2019
  • it's primary target are professional still photographers wanting high resolution images who will not mind the significant post-processing and storage issues of the very large files
  • the video features will not be exciting videographers

Brief spec comparisons

Sony a7RIII Sony a7R IV Sony a9
sensor 42mp 61mp (26mp APS-C mode) 24mp
PDAF points 399 567 693
PDAF coverage 68% 87% 93%
CDAF points 425 425 425
AF tracking with Canon lenses variable better than a7RIII much better
Buffer depth compressed RAW 76 shots 68 shots 241 shots
Buffer depth extra fine jpeg 76 68 (204 in APS-C mode) 362
burst rate 10fps 10fps 20fps (5fps mechanical)
blackout-free burst No No Yes
EVF 3.69mdot OLED 5.76mdot 3.69mdot OLED
USB 3.1 USB-C charging, 2x speed of a7RIII
SD card slots one UHS-II, one UHS-I dual UHS-II one UHS-II, one UHS-I
4K 24/30p video full frame width, no pixel binning or Super35 binned full frame or 1.6-1.8x crop Super35 crop full frame width, no pixel binning
rolling shutter poor poor minimal


  • 61mp back-illuminated Exmor R™ CMOS image sensor
  • 26.2mp APS-C crop mode has 21 sec burst at 10fps and 325 PDAF which cover almost the entire area
  • 15 stop dynamic range stills and 14 stops for video;
  • 10fps with C-AF for 7 secs;
  • improved shutter
  • 567 PDAF covering 74% frame + 425 CDAF
  • advanced Real-time Tracking plus Real-time Eye AF for still image recording
  • new 'Focus Priority' mode tells camera to acquire AF at wide open aperture at a cost of increased shutter lag
  • 5.5EV IBIS;
  • 5.76mdot EVF with 60 or 120fps refresh rate (the latter has lower resolution) - similar to the Panasonic S1/S1R
  • still has a tilting LCD not swivel
  • anti-flicker mode
  • 16 shot (4 cycles of 4 shots) HiRes mode 240mp images from a 960mp output using Sony’s “Imaging Edge™” desktop application
  • 4 shot Bayer-cancelling “HiRes” mode as in the A7RIII
  • upgraded grip and weathersealing especially around the battery and card doors which has been problematic on earlier models
  • 4K 24/30p UHD video full pixel readout oversampled from 6K with no pixel binning in Super 35mm crop mode (1.6x crop in 24p and 1.8x crop in 30p)
  • 4K 24/30p full width video but this is binned and not full pixel readout as with “Super35” mode
  • S-Log3, HDR workflow support
  • 8 bit 4:2:0 internal recording and output over HDMI
  • Touch AF Tracking functionality during movie shooting
  • Real-time Eye AF for movie recording
  • Multi Interface Shoe™ with new digital audio interface delivers the high-quality sound recording with Sony’s new microphone and XLR microphone adaptor
  • Dual UHS-II SD card slots
  • USB-C charging and almost doubled data transfer speed achieved in combination with Sony’s Imaging Edge software (compared to the Alpha 7R III)
  • 2.4GHz and 5GHz WiFi
  • $US3500
  • optional VG-C4EM vertical grip $US400 holds two NP-FZ100 batteries
  • optional Multi Battery Adaptor (NPA-MQZ1K) can hold up to four Z batteries
  • optional new ECM-B1M shotgun microphone $US350 that features a built-in Analog to Digital converter, and the brand new multi-interface hot shoe found only on the Sony a7R IV
  • optional new XLR microphone adapter kit (XLR-K3M) $US600


  • poor video specs compared with peers and likely to have much more rolling shutter than the Sony a9 full frame mirrorless camera or the latest cropped sensor cameras
  • pixel density is now approaching Micro Four Thirds system levels - what will this mean for high ISO noise?
  • very large file sizes means storage issues and very slow and frustrating post-processing
    • uncompressed RAW = 124Mb!
    • compressed lossy RAW = 62Mb
    • 16 shot 240mp HiRes image = 2Gb!!
    • and just imagine what size your post-processing files will be!
      • a 19Mb RAW file with a few layers in Affinity Photo can quickly become 1Gb and then when exported to 16bit TIFF drops back to 100-160Mb - you can multiply these by about 10 for a 61mp image!
  • each image takes about 1 sec to save to the memory card, so your 6secs of 10fps burst will mean 60 secs of writing them to the card and that is likely to mean the camera is not operational until it completes this
  • at the cost of this large file size, you are not even going to get that 61mp detail if you shoot with older lenses, you have camera shake or you shoot at higher ISO
  • no lossless RAW compression
  • no ability to use a lower resolution mode without resorting to cropping
  • menu has not been improved
  • height of camera has not changed so 5th finger will still not grip the camera well
  • tilting LCD not swivel and the touch screen functionality is still very limited
  • PDAF does not cover the full sensor but much better than a7RIII
  • no electronic faster burst modes - this is probably due to slow sensor readout and significant rolling shutter

HiRes mode


photo/sonya7riv.txt · Last modified: 2019/10/20 09:19 by gary1