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- 30.4 Megapixel full-frame CMOS sensor with ISO range 100–32,000, expandable up to 50–102,400
- 4K Motion JPEG video (DCI cinema-type 4096 x 2160) at 30p or 24p; in-camera still frame grab of 4K 8.8-Megapixel images, Full HD up to 60p, and HD up to 120p
- Dual Pixel CMOS AF for responsive and smooth AF during video or Live View shooting
- Full touch-screen interface on LCD monitor, including selection of AF area
- Up to 7.0 fps continuous shooting speed with high performance DIGIC 6+ Image Processor
- 61 AF points with expanded vertical coverage with 41 cross-points, and AF possible at all 61 AF points with many lens + extender combinations effective to f/8
- 150,000-pixel RGB+IR metering sensor
- Dual Pixel RAW, in-camera Digital Lens Optimizer during JPEG shooting and Diffraction Correction technologies
- Built-in Wi-Fi and NFC connectivity
- Built-in GPS3 for geotagging
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Key specifications
- 24MP full-frame Stacked CMOS
- 20 fps continuous shooting with full AF (electronic shutter, 12-bit files)
- Continuous shooting buffer of up to 241 compressed Raw files (362 JPEG)
- 10 fps continuous shooting with AF with adapted lenses
- 5-stop (estimated) 5-axis image stabilization
- 3.7M-dot OLED viewfinder (1280 x 960 pixels) with up to 120 fps update
- 1.44M-dot rear touchscreen LCD
- Oversampled UHD 4K/24p video from full sensor width (1.24x crop for 30p)
Review History | |
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23 Apr 2017 | Introduction, Shooting Experience, Image Quality Impressions, Autofocus Impressions published |
30 May 2017 | Studio Scene and Raw Dynamic Range published |
14 June 2017 | Full review published |
Body and controls
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The most obvious change is a general increase in the amount of direct controls; there are now dials for both drive and autofocus modes, there is an AF joystick (which is very nice to use) and dedicated AF-ON and AEL buttons. The rear jog dial has been beefed up some, the movie button has been relocated and the controls universally offer better feedback, and are more 'clicky' and less 'rubbery' than a7-series cameras.
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From left: Sony a9, Sony a7R II |
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The new 'Z' series battery for the Sony a9 comes with 2.2 times the capacity of the older 'W' models that power the a7-series cameras. |
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The screen is new, with a move to 1.44M dots or 800 x 600 resolution. That puts it well behind the retina-esque 2.4M-dot screen of the Nikon D5, meaning images don't look as crisp on the back of the camera as with the D5. The LCD is also touch-enabled, though it's essentially identical in terms of functionality (and quirkiness) to the unit on the a6500, which we just weren't impressed with. It's also disabled by default - probably not a coincidence.
Although it doesn't look any different on the outside, the new viewfinder on the a9 is a marked improvement over previous Sony cameras. It offers greater resolution (3.7 million dots as opposed to 2.4 million) and a higher framerate of 120 fps (this drops to 60 fps during continuous shooting, but with 20 fps bursts and no blackout, it's still darn impressive). The EVF offers extensive contrast since it's OLED.
Menus, customization and operation
The Sony a9 is generally more 'snappy' to use than any a7-series camera. Everything is a tad more responsive, boot-up time is claimed to be 30% faster, and you can enter playback while the camera is writing to the card (the a7R II just gives you an unnecessarily cryptic error message when you try to do this). There's still some hints of lag when you change shooting settings, especially compared to the instantaneous feedback DSLRs offer, but the a9 is nonetheless improved over other Sony cameras in this respect.![]() |
Seeing this on the Sony a9 made us do a happy dance. |
The Memory Recall modes (1, 2 and 3 on the mode dial) are now eminently more usable because Sony has increased the number of settings each mode can hold (see the full list here). We found it particularly useful to have one setup for shooting stills, one for 4K video and another for slow-motion 1080p video. That said, we're still waiting for true 'custom modes' that remember all camera settings, including button customizations.
The a9 inherits the same instant overrides top-end DSLRs provide: with 'Registered Custom Hold' assigned to various custom buttons, you can press just one button to instantly override camera settings like shoot mode (P/A/S/M), exposure parameters, metering modes, or AF modes and functionality. This could save your shot by, for example, instantly activating the correct AF mode.
Shooting Experience
By Carey Rose, originally published April 23, 2017![]() |
Sony's looking to storm the sports photography market with its new a9 mirrorless camera. |
To be blunt, past a certain threshold, burst shooting speeds don't net me appreciably more keepers in my usual style of photography. But that won't be the case with everyone, and honestly, it doesn't hinder my enthusiasm with regards to the new Sony a9, even though that's one of its headline features. Even setting burst speeds aside, this camera is among the best I've ever used. Here's why.
Background
During my time at DPReview, Sony's always left me feeling a little conflicted.On one hand, the technology and features crammed into the company's cameras are always impressive; during my interview for this job, our own Rishi Sanyal showed me Eye AF on an a7R II, and I accidentally blurted out an expletive as my jaw dropped – it was something I'd never seen before. On the other hand, I've consistently found the usability of Sony's cameras to be a primary concern for me. The interface and general operation were laggy enough to be irksome, I got lost in the menus all the time (movie options should never be nonsensically shuffled among stills options), and there were times that I felt I was fighting the camera to get it to just do what I wanted.
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Sony's RX100 V is an incredibly capable pocket camera, but the series hasn't seen any ergonomic or UI improvements in two generations. Photo by Samuel Spencer |
So, what exactly has changed with the a9?
Despite similarities to the a7-series at first glance, a lot.The buttons and dials all come with better haptic feedback1. The AF joystick replaces an eternity of clicks when moving the AF point. When you flip the screen out, the eye sensor is disabled, which resulted in fewer missed shots when working at odd angles. Boot-up time is shorter. Battery life is way better. The interface is more responsive. I don't get lost in the menus at all anymore. All of these changes add up to a camera that is more transparent, in the sense that it just 'gets out of the way' more than any previous Sony camera I've used, and lets me get on with taking pictures.
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The controls, the feel and the operation of the new a9 have all been improved relative to Sony's a7-series of full frame mirrorless cameras. |
I had a big hand in the reviews of Nikon's D5 and Canon's EOS-1D X Mark II, and while the optical viewfinder blackout on both of those cameras is incredibly short, I have to stress that the Sony a9 goes one step further in that it shows no blackout whatsoever. None. This camera makes it easier than ever to simply follow the action, and catch exactly the moment you want.
An additional plus - this camera has taken the crown for the best mirrorless autofocus system I've ever used - though it still needs a little bit of work to take the crown of best autofocus system I've used, period. At launch, we were given the opportunity to photograph hockey, figure skating and a full-on track meet, and the a9 rarely let me down, but during some extended time with our review unit, I found a few quirks. You can check them out later on in the review.
What's the catch?
Okay, there's a few catches here.First of all, do you need 20 fps? I don't. There are, of course, those that will. But that feature, that incredibly fast readout speed of that new 24MP sensor, is something you're paying for if you shell out $4,500 for this new camera, even if you're only interested in the other (not insignificant) improvements outlined above.
I shot over 2,800 images during our shooting experience with Sony in New York at the launch of the camera. That caused me worries about card space (even with a 128GB card), cost me hard drive space, and cost me time during downloading and editing. I'm no pro sports shooter, so take this with a grain of salt, but I'm having a hard time convincing myself that I got an appreciably greater number of keepers because of the a9's burst rate than I would have with a slower-shooting camera. Heck, I even switched to 10 fps halfway through to save card space, and I still came away with images I was pleased with. And it's worth noting that the absence of any blackout whatsoever is still incredibly awesome, even at 10 fps.
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This image is from the first occasion where I really soaked a camera in the name of a shoot; photographing the King County Search and Rescue team during a training exercise as part of my job for Puget Sound Energy. That D800 and 24-70mm F2.8 are still in good working order, though the rubber zoom ring on the lens had started to come a little loose. ISO 1600 | F4 | 1/100 sec Photo copyright Puget Sound Energy, image via Flickr |
And lastly, where are the XQD card slots? Yes, the a9 has an amazing buffer that I never once hit, but that buffer takes a good amount of time to clear depending on your settings - check out our Performance page for the details. Incorporating XQD cards would also have meant my download times would be appreciably reduced at the end of the day too, plus they're simply more durable for demanding situations. After having used them extensively on Nikon's D500 and D5, I'm sold: for sports cameras, faster media is the way to go.
The wrap
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Looking forward - does the a9 have what it takes to steal the hearts of sports shooters around the globe? Only time will tell. Okay, time, durability and quality of professional service and support. |
Sony says it's rolling out more robust professional support, with one-day turnaround for loaner units when a camera needs repair, and walk-in service centers in New York and Los Angeles (with more coming soon), and better support throughout Canada. That's promising, for sure, but in a chicken-and-egg dilemma, do you want to be among the first to adopt the Sony system and test the validity of those claims for yourself, or wait to see what other professionals who switch have to say?
For a professional wedding and event photographer who isn't spending hours in inclement weather, I'd say the Sony a9 is worth a look if you're used to Dx-series cameras from Nikon, and 1D-series models from Canon. With the a9, you'll save a ton of weight, have a higher frame rate (again, only relevant if you need it), and likely have an easier time following the action than with even the best DSLRs.
But it must be said, the cost of switching systems isn't something to be sneezed at – it's something we've already covered, and will continue to be a barrier to adoption of Sony's new action flagship.
1The extra haptic feedback allows you to dial in your settings confidently, without always having to confirm that you did indeed press that button, or turn that dial 3 clicks to adjust the shutter speed exactly one stop. The AF-ON and AEL buttons on the back, unfortunately, still need more 'clickiness' and need to be more prominent to easily find with your thumb.
Image quality impressions
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Out-of-camera JPEG, cropped to taste. Sony FE 70-200mm F2.8 GM | ISO 2500 | 1/1000 sec | F2.8 Photo by Carey Rose |
No real surprises; the files from the Sony a9 look to be, on the whole, very good, as is the autofocus performance, even when shooting at the full 20 fps burst speed. Note though that continuous e-shutter shooting (anything above 5 fps) does drop the camera into 12-bit mode. Further details regarding how this will impact your images are on our Raw Dynamic Range page.
Real-world, high ISO shooting
Sony's claimed to have done some tweaking to their noise reduction algorithm, to better retain detail at higher ISO values while still keeping noise in check. That's a good thing, as the a9 is likely to be shot quite often at very high shutter speeds, and therefore, higher ISO values.![]() |
Slightly processed out-of-camera JPEG. Sony FE 100-400mm F4.5-5.6 GM OSS | ISO 12800 | 1/1000 sec | F5.6 Photo by Rishi Sanyal |
Click-through to the full image to see the camera leaving plenty of detail in the runner's forehead skin, her jersey (both in the saturated blue and red regions) and even the low contrast blonde hair on her arms. It's a reaffirmation of what we've been saying for some time: Sony's detail retention in high ISO JPEGs is second to none (quantitative tests using ISO standards verify this). We just wish out-of-camera colors were more pleasing (we had to add a good deal of magenta to this image to avoid greenish skin tones).
The great mid-to-high ISO performance is also a Godsend if you forget to change your shutter speed while taking advantage of a portrait session between events. Oops.
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Out-of-camera JPEG at way too high of a shutter speed given the subject. Sony FE 70-200mm F2.8 GM | ISO 1250 | 1/1000 sec | F2.8 Photo by Carey Rose |
For those often using spot-metering: you can specify whether or not spot metering is linked to the AF point, or to the central region only. In fact, there are many new metering modes, including a highlight weighted one (a la Nikon) that tends to preserve highlights, along with up to 1/6 EV customizations per metering mode. We only wish Sony provided histograms based off of the Raw file, not the JPEG, but alas - we're beginning to think this is a pipe dream to expect from any manufacturer (save for Phase One).
Let's not forget sharpening: it's great. Sony's sharpening preserves small details and even emphasizes them, without overshoot (halos) typical of large radius over-sharpening from certain competitors. So all-in-all: the JPEGs are very good (just don't expect Fujifilm color), which is great news for press photographers and action shooters on a deadline.
Image Quality
Our latest test scene simulates both daylight and low light shooting. Pressing the 'lighting' buttons at the top of the widget switches between the two. The daylight scene is manually white balanced to give neutral grays, but the camera is left in its Auto setting for the low-light tests. Raw files are manually corrected. We offer three different viewing sizes: 'Full', 'Print', and 'Comp', with the latter two offering 'normalized' comparisons by using matched viewing sizes. The 'Comp' option chooses the largest-available resolution common to the cameras being compared.Raw performance
JPEG output
Note on banding
Early on, Diglloyd reported banding in blue skies in black and white conversions that relied heavily on the red channel. We've looked into this and while the banding does appear in the raw red channel when it's heavily underexposed (blue skies), its pattern follows that of the masked phase-detection AF rows of the sensor - where the blue pixels are masked and then binned for readout (there are 336 total masked rows).*We took this image (you can download the Raw yourself if you click-through) from our Sony 12-24G gallery and converted it using ACR with and without noise reduction. The red channel of the latter clearly shows a banding pattern to it and, interestingly, if you hover back and forth over the 100% 'No AF overlay' and 'AF overlay' crops below, you'll see the pattern matches that of the phase detection rows (indicated as black lines across the image). We're not sure how masked blue pixels end up yielding these bands in the redchannel (they're in the red channel of the Raw file before demosaicing), but the artifacts are certainly present. Click on the large image for full-size to see the artifacts clearly.
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ACR - Zero NR | ACR - defaults | No AF overlay | AF overlay |
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* Our friends Bill Claff, Jim Kasson, and forum member Horshack are to be credited with much of these findings, and for the detection of phase-detection rows.
** Bill Claff detected all phase-detection rows on the RX100 V sensor and generated an overlay that lined up perfectly with the stripes in this shot, implicating the masked pixels.
Exposure Latitude
In this test we look to see how tolerant of pushing exposure the a9's Raw files are. We've done this by exposing our scene with increasingly lower exposures, then pushed them back to the correct brightness using Adobe Camera Raw. Examining what happens in the shadows allows you to assess the exposure latitude (essentially the dynamic range) of the Raw files.Because the changes in this test noise are primarily caused by shot noise and this is mainly determined by the amount of light the camera has had access to, the results are only directly comparable between cameras of the same sensor size. However, this will also be the case in real-world shooting if you're limited by what shutter speed you can keep steady, so this test gives you an idea of the amount of processing latitude different formats give.
At smaller +1EV pushes, there's barely a difference between the cameras, but by +2EV you begin to notice a tiny bit of noise creeping into all cameras save for the a7R II. Progressively higher pushes of 4EV, 5EV, and 6EV really start to separate the cameras from one another, with the a7R II well ahead of the pack, with the D5 performing the worst.
The a9 still provides quite usable images at up to +3EV pushes, but +4EV or higher pushes from base ISO reveal a sort of patterned noise in shadows that may prove unacceptable to demanding users. Notably, this is an issue for all the high-end sports cameras presented here, likely due to constraints placed on sensors read out at high speeds. Our tests indicate the 1D X II fares the best amongst the current high-end sports cameras due its lack of patterned noise in the shadows. The (non-sports) a7R II, optimized for image quality, provides usable images even after a +6EV push at base ISO (at equivalent viewing size).
ISO Invariance
A camera with a very low noise floor is able to capture a large amount of dynamic range, since it adds very little noise to the detail captured in the shadow regions of the image. This has an interesting implication: it minimizes the need to amplify the sensor's signal in order to keep it above that noise floor (which is what ISO amplification conventionally does). This provides an alternate way of working in situations that would traditionally demand higher ISO settings.Here we've done something that may seem counter-intuitive: we've used the same aperture and shutter speed at different ISO settings to see how much difference there is between shooting at a particular ISO setting (and using hardware amplification) vs. digitally correcting the brightness, later. This has the advantage that all the shots should exhibit the same shot noise and any differences must have been contributed by the camera's circuitry.
Raw DR: ISO-invariance
Image comparison tool
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Image size:
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It's not the typical performance we've come to expect from Sony cameras, but it's similar to most sports oriented cameras (save for the a99 II). Compared to its peers the 1D X II fares a bit better, the D5 somewhat worse. Meanwhile, the a7R II pulls well ahead of the pack. The a9's advantage over the D5 drops away at a push less than ISO 400 + 4EV, and with as little as ISO 800 +3EV all the speed demons are performing similarly. Shooting natively at ISO 6400, all cameras even out in performance.
Ultimately, like its sporting peers, the a9 sensor is optimized for speed and the high readout speeds of its sensor leads to higher read noise levels. This limits low ISO dynamic range by adding noise to the lowest signals the sensor captures.
Effect of Drive mode
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There is little to no difference in base ISO dynamic range in different drive modes. So the good news is that the drop to 12-bit in continuous drive comes at no cost. The not-so-good news? 14-bit Raws aren't any better than the 12-bit ones, they're just bigger. Click here to load the above as an interactive widget. |
This indicates that even the 14-bit Raws have at most ~12 EV of dynamic range at the pixel level, placing base ISO dynamic range nearly a full stop behind the a7R II at similar (normalized) viewing size. Indeed, this is what Bill Claff found when we sent him a9 files for analysis, with little to no difference in dynamic range across drive modes.
Notably, the a7R II's 14-bit Raws have significantly less noise compared to its 12-bit Raws. Given the striking similarity between 14-bit and 12-bit Raws from the a9, we wonder if the analog-to-digital converter (ADC) is always being run in 12-bit mode regardless of drive mode. If the ADC truly is being driven in 14-bit mode, there are enough other sources of read noise to make sampling at anything above 12 bits unnecessary, according to our (and Bill's) results.
'Dual Gain' helps improve high ISO dynamic range
In our ISO-invariance widget above, you may have noticed that noise dramatically increases as you go from ISO 800 to ISO 400 (how's that for sounding completely back-to-front?). Below you'll see this more clearly as we 'zoom in' to this ISO range: shadow noise dramatically clears up as you go from an ISO 500 image (with 3.7 EV push) to an ISO 640 image (with 3.3 EV push):Above ISO 640, the camera is fairly ISO-invariant, since it's overcome most of its downstream read noise, but there's still some benefit to increasing ISO to keep noise levels low if your scene demands it. Below ISO 640, the lower conversion gain means that you'll start to see more (read) noise if you push shadows as opposed to having them pushed in-camera by increasing ISO gain.
Take home
The good news is that those worried about the camera dropping to 12-bit readout in continuous shooting needn't worry: there's no decrease in quality, since a 12 bit file can contain all its dynamic range.** The not-so-good news is that this is because the a9 doesn't appear to have more around 12 EV pixel-level dynamic range to begin with, putting its normalized base ISO dynamic range at least a stop behind that of the a7R II.A more relevant comparison might be to the a9's direct peers: it performs neck-and-neck with the Canon 1D X II (and perhaps a bit better at ISOs above 640 thanks to its dual-gain design), and a full stop better than the Nikon D5 at base ISO. Note though that extremely pushed shadows from the a9 exhibit a visually-distracting horizontal pattern in dark tones that the other cameras compared here don't.
By high ISO, general image quality catches up across all cameras, as downstream read noise becomes less important and the a9's dual gain architecture gives its performance a boost.
Ultimately, the a9's lower ISO dynamic range limits the exposure latitude of its Raws, so you'll have some limited ability to expose high contrast scenes for the highlights, then tonemap*** (raise) shadows in post. For most sports photographers this won't matter much, but those shooting high contrast scenes may require workarounds other cameras - such as the a7R II - don't.
Footnotes:
* We confirmed that continuous modes were 12-bit, while single shot modes were 14-bit, by comparing histograms of respective Raw files. The 14-bit single drive files have 14-bits of data compared to the 12-bit files (the histogram shows Raw values 1, 2, and 3 are vacant while the 14-bit files do have pixels with these values).
** Interestingly, this means there's little advantage to those large (47MB) uncompressed 14-bit Raw files, save for the lack of compression artifacts. In a perfect world, Sony would have offered a 12-bit Raw mode with an effectively lossless compression curve (without that second stage of localized compression that leads to edge artifacts) for smaller file sizes with no visual loss in quality.
*** There's a very specific reason I like to use the word 'tonemap' instead of 'raise the shadows'. We're forced to raise shadows of high contrast Raw files exposed for the highlights today because of the limited brightness of most current displays. Future displays capable of far higher brightnesses (perhaps even ten-fold) will need less shadow pushing, or tone-mapping, to make visible what you currently see as 'shadows' in such traditionally underexposed Raw files. For example, shadows you currently push +4 EV will likely be visible without any pushing at all on a 4,000 nit-capable display.
Performance
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When shooting 4K video, Sony says the a9 uses 40% less power consumption than the a7R II, even though it is oversampling from a 6K readout of the sensor. Startup times are 30% faster, and the camera feels generally snappier to use than previous Sony full-frame models.
One aspect of the a9 that may leave users scratching their heads concerns the use of SD cards, with only one UHS-II compatible slot. Sure, XQD cards are physically larger, but they're incredibly fast - you'll never have to wait for a Nikon D5 or D500 to finish writing when you're done shooting. Thankfully, you can enter playback while images are being written and see how many are left to go, but you can't enter the menus to change any settings there.
In terms of burst shooting, one of the headline features of the a9 is that it shoots at 20fps with full autofocus and autoexposure - unless you're shooting uncompressed Raw, which results in the camera dropping to 12fps. So you'll have to put up with Sony's localized compression that can lead to artifacts if you want 20 fps (we'd like to see a lossless compressed Raw mode that still allows the camera to hit 20 fps). Now let's say, somehow, you hit the huge buffer on the a9. Here's how long you'll need to wait before you can go into the menus and change things; take particular note of the effect processing the JPEGs can have.
Quality | Number of images captured | Buffer clear time |
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Uncompressed Raw (12fps) | 132 | 0:32 |
Uncompressed Raw + JPEG (12fps) | 124 | 0:39 |
Compressed Raw | 245 | 0:38 |
Compressed Raw + JPEG | 236 | 0:55 |
JPEG - Xtra Fine | 368 | 2:05 |
JPEG - Fine | 365 | 1:05 |
Lastly, you happen to turn the camera off while it's writing to the card, the camera will power down, though the card write light will stay illuminated until it's done - and if you power it back on, the camera will boot up and function as normal. Some other fast-shooting cameras, such as the Leica SL, don't let you do this, requiring you to wait until the camera has finished writing and then reboot if you hit the power switch before a burst is done recording.
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