Camera Reviews / Sony Cameras / Sony Alpha i Review

24.30 Megapixels	Sony E	35mm size sensor

Sony A7 Review

Overview and Technical Info by Mike Tomkins
Extended Walkaround by Dave Etchells and Mike Tomkins
Field Test by David Schloss

Preview posted: 10/16/2013
Review finalized: 04/18/2014

Updates:
11/7/2013: Added Image Quality Comparison
03/07/2014: Added Field Test Part I and Part II
04/18/2014: Added Print Quality and Conclusion

A little over a decade ago, enthusiast photographers were clamoring for an affordable APS-C digital SLR. That dream has long since become a reality, but for some, the dream wasn't big enough. They've been asking for an altogether different -- yet still affordable -- camera. They needed it to have a bigger sensor, and to drop the bulky mirror box of an SLR. Until now, they could choose one or the other. Sony has changed all that, with the launch of the full-frame Sony A7 and A7R mirrorless cameras.

The two cameras are very closely-related, and in this first impressions review, we'll be looking at the Sony A7. It's the lower-resolution of the two models -- albeit still pretty high-res, compared to what's available in its mirrorless and DSLR rivals -- but it has some important advantages over the A7R in other areas. If resolution above all else is your goal, though, you'll want to take a look at our Sony A7R review, instead.

Design. Externally, there's very little to tip you off to which of the two cameras you're looking at beyond their badges. The Sony A7 is just slightly heavier than its sibling, but the difference is not one you'd notice, even holding the two cameras side-by-side. Despite being heavier, it also features just slightly more plastic in its construction. You can tell the difference by touch -- the A7's front panel is warmer plastic, and that of the A7R is cooler metal. The A7's Mode dial and Exposure Compensation dial are also just slightly different, with coarser knurling on the former, and a slight increase in height on the latter. None of these physical differences is noticeable unless you're looking very closely indeed.

Differences between the Sony A7, A7S and A7R
Camera	Sony A7S	Sony A7	Sony A7R
Body-only List Price	Unknown	US$1,700	US$2,300
Available in Kit with Lens	Unknown	Yes	No
Body Materials	Magnesium alloy	Magnesium alloy and polycarbonate	Magnesium alloy
Sensor Size	35.8 x 23.9mm	35.8 x 23.9mm	35.9 x 24.0mm
Sensor Resolution (Total)	12.4 mpix	24.7 mpix	36.8 mpix
Sensor Resolution (Effective)	12.2 mpix	24.3 mpix	36.4 mpix
Maximum Image Size	4,240 x 2,832 pixels	6,000 x 4,000 pixels	7,360 x 4,912 pixels
Standard ISO sensitivity (Still)	100 - 102,400	100 - 25,600	100 - 25,600
Expanded ISO sensitivity (Still)	50 - 409,600	50 - 25,600	50 - 25,600
Standard ISO sensitivity (Video)	200 - 102,400	200 - 25,600	200 - 25,600
Expanded ISO sensitivity (Video)	200 - 409,600	N/A	N/A
Electronic First Curtain Shutter	Yes, optional	Yes, optional	No
On-chip Phase Detect Pixels?	No	Yes	No
Continuous Shooting Rate (with continuous autofocus)	2.5 fps max.	2.5 fps max.	1.5 fps max.
Speed Priority Continuous Shooting Rate	5.0 fps max. (No continuous AF)	5.0 fps max. (Continuous AF supported)	4.0 fps max. (No Continuous AF)
Autofocus Type	Contrast Detection 25-points	Fast Hybrid AF 117-point (phase detect) 25-point (contrast detect)	Contrast Detection 25-points
Predictive Autofocus Tracking	No	Yes	No
Flash Sync Speed	1/250 second	1/250 second	1/160 second
Maximum resolution for HDMI live view	3,840 x 2,160 pixels	1,920 x 1,080 pixels	1,920 x 1,080 pixels
Video codecs	XAVC S / AVCHD / MP4	AVCHD / MP4	AVCHD / MP4
Maximum clip length	29 min. (XAVC S); 29 min. (AVCHD); 20 min. / 2GB (MP4)	29 min. (AVCHD); 20 min. / 2GB (MP4)	29 min. (AVCHD); 20 min. / 2GB (MP4)
120fps at 720p?	Yes	No	No
S-Log 2 gamma option	Yes	No	No
Picture profile function	Yes	No	No
Time code	Yes	No	No
Maximum Magnification (Playback)	13.3x	18.8x	23.0x
Battery life (Still)	380 shots (LCD) 320 shots (EVF)	340 shots (LCD) 270 shots (EVF)	340 shots (LCD) 270 shots (EVF)
Battery life (Video, clips with power-cycling and zoom)	60 min. (LCD); 55 min. (EVF)	65 min. (LCD); 60 min. (EVF)	60 min. (LCD); 65 min. (EVF)
Battery life (Video without power-cycling or zoom)	90 min. (EVF / LCD)	100 min. (EVF / LCD)	90 min. (EVF / LCD)
Weight (Body Only)	15.7 ounces (446g)	14.7 ounces (416g)	14.4 ounces (407g)
Weight (with battery and Memory Stick PRO Duo flash card)	17.2 ounces (489g)	16.7 ounces (474g)	16.4 ounces (465g)

Full-frame sensor. It's under the skin where you'll find the important differences, though, and they relate almost entirely to the choice of image sensor. The 24.3-megapixel Sony A7 has one-third fewer pixels than its sibling, but its sensor includes a generous helping of phase detection pixels. That allows it to offer a hybrid autofocus system, where the A7R is contrast-detect only. The A7's hybrid system allows for significantly faster autofocusing, not to mention better AF tracking. It also provides a significant improvement in burst shooting performance, whether or not exposure and autofocus are locked.

The higher-resolution sensor of the Sony A7R will be attractive for some for whom focus speed isn't such an issue, however, such as landscape photographers. (Even if the A7 is itself no slouch in the resolution department.)

Lenses. Speaking of lenses, the Sony A7 and its sibling will both accept existing Sony E-mount lenses, albeit with an APS-C crop or vignetting. They'll also accept Alpha-mount lenses -- be they cropped or full-frame -- with an adaptor.

Full-frame optics. Of most interest, though, are several brand-new, full-frame E-mount optics, branded as "FE" lenses. Five FE-series full-frame E-mount lenses have been announced for separate sale, and four have pricing and availability information. The FE 35mm f/2.8 ZA and FE 28-70mm f/3.5-5.6 OSS lenses were the first to ship this December, priced at US$800 and US$500 respectively. The FE 55mm F1.8 ZA prime followed from January 2014, priced at US$1,000. The first zoom option for the Sony A7R arrived in February 2014, in the form of the FE 24-70mm F4 ZA OSS for US$1,200. Finally, an FE 70-200mm F4 G OSS telephoto zoom is planned, but Sony hasn't disclosed when it plans to ship this lens, nor at what price.

Lens adapters. There are also two new full frame-specific mount adapters. One -- the LA-EA3 -- has been available for a while in a bundle with the NEX-VG900 full-frame camcorder. The other is the LA-EA4, and adds a Translucent Mirror plus phase detect AF sensor, much like the existing APS-C format LA-EA2. The LA-EA3 costs US$200, and the LA-EA4 costs US$350. Both shipped from early December 2013.

Accessories. Finally, there are several related accessories to choose from. The Vertical Grip for A7 and A7R costs US$300, and a leather case costs US$140. Screen protectors are priced at US$15, and a new W-series battery charger at US$50. Finally, an off-camera flash shoe is priced at US$50. All of these accessories have been available since December 2013 or January 2014.

Let's take a closer look at the Sony A7.

Place your order with trusted Imaging Resource affiliate Adorama now:

• Sony A7 body -- Black, body only, US$1,698 with free shipping
• Sony A7 28-70mm kit -- Black, with FE 28-70mm f/3.5-5.6 OSS kit lens, US$1,998 with free shipping
• Sony Sonnar T* FE 35mm f/2.8 ZA lens -- US$798 with free shipping
• Sony Sonnar T* FE 55mm f/1.8 ZA lens -- US$998 with free shipping
• Sony 24-70mm f/4 Vario Tessar T* FE ZA OSS lens -- US$1,198 with free shipping

Or with Amazon:

• Sony A7 body -- Black, body only, US$1,698, free shipping for Prime members
• Sony A7 28-70mm kit -- Black, with FE 28-70mm f/3.5-5.6 OSS kit lens, US$1,998, free shipping for Prime members
• Sony Sonnar T* FE 35mm f/2.8 ZA lens -- US$798, free shipping for Prime members
• Sony Sonnar T* FE 55mm f/1.8 ZA lens -- US$998, free shipping for Prime members
• Sony 24-70mm f/4 Vario Tessar T* FE ZA OSS lens -- US$1,198, free shipping for Prime members

Or with B&H Photo Video:

• Sony A7 body -- Black, body only, US$1,698 with free shipping
• Sony A7 28-70mm kit -- Black, with FE 28-70mm f/3.5-5.6 OSS kit lens, US$1,998 with free shipping
• Sony Sonnar T* FE 35mm f/2.8 ZA lens -- US$798 with free shipping
• Sony Sonnar T* FE 55mm f/1.8 ZA lens -- US$998 with free shipping
• Sony 24-70mm f/4 Vario Tessar T* FE ZA OSS lens -- US$1,198 with free shipping

 

Walkaround. The Sony A7 feels wonderful in the hand. Although its body couples magnesium alloy and plastic, it's still very solid, with a similar sense of quality and precision in its operation to that of the A7R. (In fact, were it not for the difference in the perception of temperature given by the metal and plastic panels, we'd probably have assumed the construction to be entirely metal.)

Controls provide good tactile feedback, and command dials strike the right balance between stiffness -- so they won't be jostled accidentally -- and ease of operation. (Although we might wish for just a tad less stiffness on the exposure compensation dial.)

Given that we were huge fans of the Sony RX1's user interface, and loved the "Tri-Navi" interface on the Sony NEX-7, it's probably no surprise that we found ourselves liking the user experience of the new Sony Alpha 7 a lot as well. It's something of a melding of the characteristics of the two previous cameras. In many ways, this new camera feels a lot like a big brother to the NEX line, but Sony has chosen to label it an Alpha -- perhaps hoping to associate it more with the higher end of their ILC line. While the Sony A7 and its higher-resolution sibling the Sony A7R have a lot in common with the NEX series, there are also some obvious differences.

The Sony A7 is bigger than the typical NEX-series camera, as you might expect given its full-frame image sensor and built-in electronic viewfinder, but it's not as large as you might have feared. Compared to the NEX-7,which features an APS-C sized sensor, it's around 1.1 inches taller, and 0.3 inches wider / thicker. The majority of that difference is due to its viewfinder, which stands well proud of the camera's top deck at the shoulders.

The body is somewhat larger than that of the Sony RX1, but maybe not as much bigger as we were expecting. The body itself is only slightly taller, thicker, and wider than the RX1's, the big difference being the large EVF housing on top, which adds greatly to the sense of bulk. The 35mm f/2.8 lens isn't actually too much larger than the 35mm f/2.0 optic on the RX1, but the combined bulk of body and lens (particularly a zoom) is enough that it really puts it into a different category than the RX1. The RX1 could be considered a coat-pocket camera, but you'd have to have an awfully big coat to squeeze the Sony A7 into it.

That said, we felt that the Sony Alpha 7 was quite well balanced with all three lenses we tried it with. I'd say it's still a two-handed camera, particularly given that you'll want to have a hand on the zoom and/or focus rings of the lens, but it feels very nicely balanced with a moderate-sized lens like the 28-70mm f/3.5-5.6 kit optic attached, and it's no trouble at all to hold one-handed, as for over-the-head shots in a crowd.

Of course, saying that the Sony A7 is bigger than the RX1 may not mean all that much: Compared to any other full-frame interchangeable-lens camera (apart, perhaps from the rangefinder-style and considerably less feature-rich Leica M9), it's downright diminutive. The current size extremes in Sony's Translucent Mirror range are the APS-C sensor-shod Sony A37, and the full-frame Sony A99. The Sony A7 is 0.1 inches wider and taller than the A37, but a much more significant 0.8 inches narrower and shorter than the A99. More importantly, it's 1.1 to 1.3 inches slimmer than both, without a lens mounted. Getting rid of the mirror box clearly still pays dividends on size for a full-frame camera, then.

The Sony Alpha 7's grip is wider than some, but not very deep. Our personal preference is for deeper/narrower, but we found the Alpha 7 very comfortable to hold. This is partly due to the nice thumb-rest on the back of the camera and the leather-textured rubbery plastic coating on the grip and right rear of the camera, the combination of which meant our hold on the camera always felt very secure. We also found the various dials mounted on or just beneath the top deck were very easy to access while holding the camera, and the shutter button was comfortably positioned as well.

Seen from the front, things are pretty straightforward. The Sony A7's front surface is mostly smooth and featureless, save for the hand grip, Sony E lens mount, autofocus assist lamp, and a few controls. Of particular note is just how large that full-frame sensor appears, occupying the great majority of the E-mount's interior. For a comparison, take a look at this image from our review of the Sony NEX-7, which features a more typical APS-C sized sensor. The lens mount release button sits snug beneath and to the right of the lens mount (as seen from the rear of the camera), right where you'd expect to find it.

The handgrip is relatively shallow and wide, as we'll see in the top view momentarily, with a slight indent in the front surface that helps give more purchase for the fingers. An infrared receiver sits behind a small oval window near the base of the grip. At its top sits the front control dial, partially recessed in a small plateau below the camera's top deck. Just above and to the left sits the bright orange autofocus assist lamp.

Jumping to the top of the camera, it's clear that it's aimed at experienced photographers. As well as the front dial crowning the hand grip, and another control dial peeking out from behind the Mode dial and Shutter button, there's a third dial dedicated to exposure compensation at the very right-hand end. In front of this sits a Custom button, and the Shutter button is encircled by a Power lever.

Moving left, the electronic viewfinder hump -- there's no prism here, since this is a mirrorless camera -- is topped by Sony's Multi Interface Shoe. From this angle it doesn't look like an intelligent shoe, but when seen from the rear you can just make out terminals tucked beneath its front surface that allow communication not just with strobes, but with other accessories such as a clip-on LCD monitor or external microphone adapter. On either side of the electronic viewfinder hump are two single-hole microphone ports, which together provide for stereo audio. A small two-hole speaker sits just left of the hump, alongside the focal plane mark.

Switching to the rear deck gives a clearer view of that second control dial, but the dominant features here are the 3.0-inch tilting LCD monitor, and the electronic viewfinder which sits just above it.

The Sony A7's eye-level electronic viewfinder is housed in angular bulge very reminiscent of the pentaprism on an SLR. EVFs have been steadily evolving in recent years, and the one in the Sony A7 is a good example of the state of the art. It uses OLED technology, and sports no fewer than 2.4 million dots, a level of resolution that means we can only just barely see hints of pixels along the edges of letters, and not at all in images displayed.

Its very high resolution is only part of the story of the Sony A7's EVF, though. Perhaps more important are the optics that Sony's put behind it. Viewfinder optics are often an afterthought in camera design, with optical artifacts like coma, blur, and chromatic aberration all too common. Since they're not being used to take a picture through, they often receive short shrift in the camera-design process.

Not so the EVF on the Sony A7. It uses a three-lens optical system similar to that found in the flagship Sony A99 SLT camera, although with a slightly improved configuration. The dioptric adjustment range for eyeglass-wearers is an unusually broad -4 to +3 diopters, very welcome for far- or nearsighted people. The net result is a very highly-corrected view of the OLED screen, that's sharp from corner to corner, with nary a sign of chromatic aberration anywhere, and a nice, wide field of view (0.71x with a 50mm lens focused at infinity). The OLED screen itself has also been enhanced a good bit, with three times the contrast of the one used in the A99. The result is a remarkably clear view with better than average dynamic range, although still not quite up to what my eye can see when looking through an optical viewfinder. There are some areas in which optical viewfinders still outperform EVFs, but there are at least as many in which EVFs surpass, and the one in the Sony A7 is truly state of the art for current technology.

The EVF has much higher resolution, with 2.4 million dots (1,024 x 768 RGB pixels), versus the 921,600 dots (640 x 480 RGB pixels) of the LCD monitor. If critical focus is key, you'll want to use the viewfinder. We'd imagine most Sony A7 shooters will be doing so -- we certainly did. Proximity sensors above the viewfinder are used to switch between this and the main display automatically, when you bring the camera to your eye, and away again.

The rear deck controls are fairly straightforward, with no NEX-style soft buttons employed. The Menu button sits above the monitor, as does a second Custom button. Beneath the rear Control dial is an Auto / Manual focus selector switch, at the center of which sits an Auto-exposure Lock button. Below is a Function button, which also serves to enable Wi-Fi sharing in Playback mode.

Further down, there's a cluster of four controls which bear a little more discussion. Another rear Control dial also doubles as a Four-way rocker, and during image capture is used to select the Drive mode, Display mode, or White Balance mode by pressing its left, top, or right sides. At its center is a Select button, used to acknowledge menu options, settings changes, and so forth. Directly beneath the dial are the Playback button, and a Delete button which also serves as yet another Custom button when in record mode.

Moving to the camera's left side and starting from the top, there's a neck strap eyelet with, unfortunately a metal D-ring. (Not our favorite thing to see on a video-capable camera, since the metal-on-metal interface tends to generate handling noise every time you so much as look at the neck strap.)

Beneath are two rubber flaps which cover most of the camera's side. The top flap conceals audio connectivity -- both a 3.5mm stereo microphone jack, and a 3.5mm stereo headphone jack. The lower flap covers Sony's Multi Terminal interface, which provides for both USB 2.0 Hi-Speed and standard-definition video output, as well as wired remote control connectivity. The same flap also hides the Type-D Micro HDMI connector, which you'll use to get your images onto a high-definition display.

The right side of the Sony A7 is as simple as can be: There's a second neck strap eyelet with D-ring, and a Movie Record button which is tucked into the side of the rear-panel thumb grip. Beneath is the memory card compartment door, behind which you'll find a single shared Secure Digital / Memory Stick PRO Duo card slot. Wi-Fi and NFC logos hint at the inclusion of these two wireless networking features, and the latter provides near-instant pairing with many Android devices, simply by holding them alongside the logo momentarily. (Apple doesn't, as yet, support NFC in any of its products.)

And in the interests of completeness, let's take a quick look at the camera's base. The Sony A7 features a metal tripod socket, nicely positioned on the central axis of the lens. (That's where you want it, to minimize parallax error during panorama shooting.) A battery compartment door resides in the bottom of the handgrip, and includes a small rubber cutout which provides ingress for the dummy battery cable of an optional AC adapter kit.

User interface. We mentioned the Sony A7's user interface at the outset: Let's look at it in a bit more detail. It bears a passing resemblance to the Tri-Navi interface on the NEX-7, in that it has both a front and rear dial, plus the back-panel dial control to adjust settings with. In addition, there's a dedicated exposure-compensation dial on the right rear corner of the camera's top panel, in easy reach of your thumb.

Compared to the RX1, controls on the Sony A7 are equally configurable, but also have explicit default functions printed on the camera body next to some of them. The lack of such labels on the RX1 had a lot to do with how quickly we were moved to assign our own, custom function layout to them. That little nudge to free myself from the default functions was a big plus, but we imagine a lot of users would be more comfortable with having the default functions labeled, as on the A7.

Despite the presence of the labels, the Sony A7's user interface is exceptionally configurable. The C1 button on the top panel and the C2 button at the top of the rear panel are of course both configurable, as is the C3 button, which doubles as the Trash button in playback mode. All three of these buttons can have any of 46 functions assigned to them, or they can be left unassigned. Additionally, the center button of the rear controller can have any of 47 functions assigned, and the left, right, and down keys can each have any of 39 assigned to them. This surely sets a new benchmark for camera configurability. (There may have been a camera or cameras with more configuration options, we just can't recall any.)

While it takes a little while to settle on the best configuration for a highly-customizable user interface like this, and some more time before your custom configurations become second nature, the benefit to regular shooters is huge. Rather than cursing a multi-level menu system, the camera becomes a fluid extension of your creative process. The impact of the sort of deep configurability of the Sony A7's user interface shouldn't be underestimated.

Menus and on-screen controls. We rather liked the default menu system as well, being something of a hybrid between that used on the NEX line and the more conventional enthusiast-oriented menus of the Alpha series. The top level is more NEX-like, with six tiles offered to let you quickly access the particular category of functionality you're interested in. Once you select a tile, you're dropped into a standard Alpha menu system, but on the appropriate tab set. We found this a good bit quicker than having to scroll through all the menu tabs between wherever we entered the menu system and where we wanted to be, as is generally the case in standard tabbed menu systems. We'd have to time ourselves with a stopwatch to say whether the tiled approach actually ended up faster or not (you still have to scroll between tiles, after all), but it certainly felt faster when we were using it. You can disable this tiled front-end if you wish, though, via a setup menu function, and the menu button will drop you directly in to the tabbed menu system.

There's also a "Quick Navi" interface that provides access to a wide range of camera functions, accessed by default via the Fn button. The operation of this menu on the Sony Alpha 7 is a step forward from some other Sony models, in that you can immediately change a setting with the front/rear control dials as soon as you've scrolled the cursor to it with the left/right keys. Some cameras require you to press the center OK button before you can change the settings, which always caused a bit of a mental disconnect for us. On the Sony A7, though, you can immediately make changes with the front dial, once the cursor has highlighted a particular function. A number of settings have sub-settings for them (such as exposure bracketing, where you can pick both the number and size of the exposure steps), and in those cases, the front dial selects the main setting, and the rear one the sub-setting. It's a very fast, fluid, and intuitive setup.

As with the camera's many control buttons, the Quick Navi menu is also highly configurable. Each of the 12 slots in it can have any of 27 different functions assigned to it, or that slot can be left blank.

No more modal menu failures! In recent history, Sony's menus have been very modal, in that various options would be grayed-out if they didn't apply to the current camera configuration. (For example, a setting pertaining to manual focus would be grayed out if you were in an autofocus mode.) The problem was, the camera wouldn't tell you why something was grayed out! It was often a puzzle, and a guessing game of many steps to figure out why the @#! you couldn't change a given menu setting.

We suspect others complained to Sony about this as well, so it probably wasn't just us bringing it up every time we had a chance to talk with their engineers, but we're happy to report that Sony listened, and the new A7 actually tells you why you can't access grayed-out menu options! To our mind, this was the single biggest thing Sony needed to change in their user interface, and they've done it! Not every grayed-out menu has an information screen associated with it (a couple in the setup menus just say "this function is currently disabled"), but this is still a huge step forwards for ease-of-use.

 

In the Box

The Sony A7 retail box ships with the following items:

• Sony A7 camera body
• Sony FE28-70mm F3.5-5.6 OSS (SEL 2870) lens if purchased as kit
• Front and rear lens caps (if lens included)
• Body cap
• NP-FW50 lithium-ion rechargeable battery pack
• AC-UB10 battery charger (charges in-camera via USB)
• Hot shoe cap
• Eyepiece cup
• Shoulder strap
• Micro USB cable
• Instruction manual
• CD-ROM with Sony PlayMemories Home and Image Data Converter 4 software

 

Recommended Accessories

• Extra NP-FW50 battery pack for extended outings
• BC-VW1, BC-QM1, or BC-TRW battery charger (if you want to charge one battery while shooting with another)
• VG-C1EM vertical grip (if you want portrait-orientation controls, and extended battery life)
• Large capacity SDHC/SDXC memory card. Given the high resolution and large file sizes of the A7R, 32GB is a good tradeoff between cost and capacity. If you plan to capture HD movie clips, shoot image bursts, or shoot in RAW format, look for cards with UHS-I markings.
• LA-EA3 or LA-EA4 lens mount adapters (to use Sony Alpha-mount lenses)
• External shoe mount flash (HVL-F20M, HVL-F60M, or HVL-F43M), or other accessory flash
• ADP-MAA shoe mount adapter (if you want to use an older strobe with Sony / Konica Minolta's proprietary shoe, colloquially known as an iISO shoe)
• AC-PW20AM power supply kit with DC coupler
• HVL-LEIR1 or HVL-LE1 video light
• ECM-CG50 mono or ECM-ALST1 / ECM-XYST1M / XLR-KM1 stereo microphone
• CLM-V55 clip-on LCD monitor
• RM-VPR1 or RMT-DSLR2 remote commander
• PCK-LM16 screen protector
• Medium size camera bag

 

Sony A7 vs. Sony A7R (full editorial comparison)

Sony A7 vs. Fuji X-T1

Sony A7 vs. Olympus E-M1