Sony A5100 vs A77
The Sony Alpha A5100 and the Sony Alpha SLT-A77 are two digital cameras that were officially introduced, respectively, in August 2014 and August 2011. The A5100 is a mirrorless interchangeable lens camera, while the A77 is a DSLR. Both cameras are equipped with an APS-C sensor. Both cameras offer a resolution of 24 megapixels.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.
|Sony A5100||Sony A77|
|Mirrorless system camera||Digital single lens reflex|
|Sony E mount lenses||Sony A mount lenses|
|24 MP, APS-C Sensor||24 MP, APS-C Sensor|
|1080/60p Video||1080/60p Video|
|ISO 100-25600||ISO 100-16000 (50-25600)|
|No viewfinder, LCD framing||Electronic viewfinder (2359k dots)|
|3.0" LCD, 922k dots||3.0" LCD, 921k dots|
|Tilting touchscreen||Fully flexible screen (no touchscreen)|
|6 shutter flaps per second||12 shutter flaps per second|
|Lens stabilization only||In-body stabilization|
|Not weather sealed||Weathersealed body|
|400 shots per battery charge||470 shots per battery charge|
|110 x 63 x 36 mm, 283 g||143 x 104 x 81 mm, 732 g|
Going beyond this snapshot of core features and characteristics, what are the differences between the Sony Alpha A5100 and the Sony Alpha SLT-A77? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.
An illustration of the physical size and weight of the Sony A5100 and the Sony A77 is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All size dimensions are rounded to the nearest millimeter.
The A5100 can be obtained in two different colors (black, white), while the A77 is only available in black.
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A77 is considerably larger (115 percent) than the Sony A5100. Moreover, the A77 is substantially heavier (159 percent) than the A5100. It is noteworthy in this context that the A77 is splash and dust-proof, while the A5100 does not feature any corresponding weather-sealing.
The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.
Concerning battery life, the A5100 gets 400 shots out of its NP-FW50 battery, while the A77 can take 470 images on a single charge of its NP-FM500H power pack. The power pack in the A5100 can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.
The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. In case you want to display and compare another camera duo, just click on the right or left arrow next to the camera that you would like to inspect. Alternatively, you can also use the CAM-parator to select your camera combination among a larger number of options.
|Sony A5100»||110 mm||63 mm||36 mm||283 g||400||n||Aug 2014||549||Sony A5100|
|Sony A77«||143 mm||104 mm||81 mm||732 g||470||Y||Aug 2011||1,399||Sony A77|
|Panasonic GH5« »||139 mm||98 mm||87 mm||725 g||410||Y||Jan 2017||1,999||Panasonic GH5|
|Sony A9« »||127 mm||96 mm||63 mm||673 g||650||Y||Apr 2017||4,499||Sony A9|
|Sony RX100 IV« »||102 mm||58 mm||41 mm||298 g||280||n||Jun 2015||999||Sony RX100 IV|
|Sony A7 II« »||127 mm||96 mm||60 mm||599 g||350||Y||Nov 2014||1,999||Sony A7 II|
|Sony A77 II« »||143 mm||104 mm||81 mm||647 g||480||Y||May 2014||1,199||Sony A77 II|
|Sony A5000« »||110 mm||63 mm||36 mm||269 g||420||n||Jan 2014||449||Sony A5000|
|Sony A6000« »||120 mm||67 mm||45 mm||344 g||360||n||Feb 2014||599||Sony A6000|
|Sony RX100 III« »||102 mm||58 mm||41 mm||290 g||320||n||May 2014||799||Sony RX100 III|
|Sony A3000« »||128 mm||91 mm||85 mm||411 g||470||n||Aug 2013||329||Sony A3000|
|Sony NEX-3N« »||110 mm||62 mm||35 mm||269 g||480||n||Feb 2013||499||Sony NEX-3N|
|Sony RX100 II« »||102 mm||58 mm||38 mm||281 g||350||n||Jun 2013||749||Sony RX100 II|
|Sony A99« »||147 mm||111 mm||78 mm||812 g||500||Y||Sep 2012||2,799||Sony A99|
|Sony NEX-F3« »||117 mm||67 mm||42 mm||314 g||470||n||May 2012||599||Sony NEX-F3|
|Sony RX100« »||102 mm||58 mm||36 mm||240 g||330||n||Jun 2012||649||Sony RX100|
|Sony NEX-3« »||117 mm||62 mm||33 mm||297 g||330||n||May 2010||599||Sony NEX-3|
|Note: Measurements and pricing do not include easily detachable parts, such as interchangeable lenses or optional viewfinders.|
The price is, of course, an important factor in any camera decision. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The A5100 was launched at a markedly lower price (by 61 percent) than the A77, which puts it into a different market segment. Normally, street prices remain initially close to the MSRP, but after a couple of months, the first discounts appear. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down.
The imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. A large sensor will generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have richer color-depth than smaller pixels in a sensor of the same technological generation. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to isolate a subject from the background. On the downside, larger sensors are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.
Both cameras under consideration feature an APS-C sensor and have a format factor (sometimes also referred to as "crop factor") of 1.5. Within the spectrum of camera sensors, this places the review cameras among the medium-sized sensor cameras that aim to strike a balance between image quality and portability. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
The two cameras under review do not only share the same sensor size, but also offer an identical resolution of 24 megapixels. This similarity in sensor specs implies that both the A5100 and the A77 have the same pixel density, as well as the same pixel size. It should, however, be noted that the A5100 is much more recent (by 2 years and 11 months) than the A77, and its sensor will have benefitted from technological advances during this time.
The A5100 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.
The Sony Alpha A5100 has a native sensitivity range from ISO 100 to ISO 25600. The corresponding ISO settings for the Sony Alpha SLT-A77 are ISO 100 to ISO 16000, with the possibility to increase the ISO range to 50-25600.
Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). The Overall DXO ratings for the two cameras under consideration are close, suggesting that they provide similar imaging performance. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.
|Sony A5100||APS-C||24.0||6000||4000||1080/60p||23.8||12.7||1347||80||Sony A5100|
|Sony A77||APS-C||24.0||6000||4000||1080/60p||24.0||13.2||801||78||Sony A77|
|Panasonic GH5||Four Thirds||20.2||5184||3888||4K/60p||23.9||13.0||807||77||Panasonic GH5|
|Sony A9||Full Frame||24.0||6000||4000||4K/30p||24.9||13.3||3517||92||Sony A9|
|Sony RX100 IV||1-inch||20.0||5472||3648||4K/30p||22.8||12.6||591||70||Sony RX100 IV|
|Sony A7 II||Full Frame||24.0||6000||4000||1080/60p||24.9||13.6||2449||90||Sony A7 II|
|Sony A77 II||APS-C||24.0||6000||4000||1080/60p||..||..||..||..||Sony A77 II|
|Sony A5000||APS-C||19.8||5456||3632||1080/60i||23.8||13.0||1089||79||Sony A5000|
|Sony A6000||APS-C||24.0||6000||4000||1080/60p||24.1||13.1||1347||82||Sony A6000|
|Sony RX100 III||1-inch||20.0||5472||3648||1080/60p||22.4||12.3||495||67||Sony RX100 III|
|Sony A3000||APS-C||19.8||5456||3632||1080/60i||23.7||12.8||1068||78||Sony A3000|
|Sony NEX-3N||APS-C||16.0||4912||3264||1080/60i||22.8||12.5||1067||74||Sony NEX-3N|
|Sony RX100 II||1-inch||20.0||5472||3648||1080/60p||22.5||12.4||483||67||Sony RX100 II|
|Sony A99||Full Frame||24.0||6000||4000||1080/60p||25.0||14.0||1555||89||Sony A99|
|Sony NEX-F3||APS-C||16.0||4912||3264||1080/60i||22.7||12.3||1114||73||Sony NEX-F3|
|Sony RX100||1-inch||20.0||5472||3648||1080/60p||22.6||12.4||390||66||Sony RX100|
|Sony NEX-3||APS-C||14.0||4592||3056||720/30p||22.1||12.0||830||68||Sony NEX-3|
Many modern cameras are not only capable of taking still images, but also of capturing video footage. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, and both provide the same movie specifications (1080/60p).
Apart from body and sensor, cameras can and do differ across a range of features. For example, the A77 has an electronic viewfinder (2359k dots), which can be very helpful when shooting in bright sunlight. In contrast, the A5100 relies on live view and the rear LCD for framing. The table below summarizes some of the other core capabilities of the Sony A5100 and Sony A77 in connection with corresponding information for a sample of similar cameras.
|Sony A5100||none||n||3.0||922||tilting||Y||1/4000s||6.0||Y||n||Sony A5100|
|Sony A77||2359||Y||3.0||921||full-flex||n||1/8000s||12.0||Y||Y||Sony A77|
|Panasonic GH5||3680||n||3.2||1620||swivel||Y||1/8000s||12.0||n||Y||Panasonic GH5|
|Sony A9||3686||n||3.0||1440||tilting||Y||1/8000s||20.0||n||Y||Sony A9|
|Sony RX100 IV||2359||n||3.0||1228||tilting||n||1/2000s||16.0||Y||Y||Sony RX100 IV|
|Sony A7 II||2400||n||3.0||1230||tilting||n||1/8000s||5.0||n||Y||Sony A7 II|
|Sony A77 II||2359||Y||3.0||1229||full-flex||n||1/8000s||12.0||Y||Y||Sony A77 II|
|Sony A5000||none||n||3.0||461||tilting||n||1/4000s||3.5||Y||n||Sony A5000|
|Sony A6000||1440||n||3.0||922||tilting||n||1/4000s||11.0||Y||n||Sony A6000|
|Sony RX100 III||1440||n||3.0||1229||tilting||n||1/2000s||10.0||Y||Y||Sony RX100 III|
|Sony A3000||202||n||3.0||230||fixed||n||1/4000s||2.5||Y||n||Sony A3000|
|Sony NEX-3N||optional||n||3.0||460||tilting||n||1/4000s||4.0||Y||n||Sony NEX-3N|
|Sony RX100 II||optional||n||3.0||1229||tilting||n||1/2000s||10.0||Y||Y||Sony RX100 II|
|Sony A99||2359||Y||3.0||1229||full-flex||n||1/8000s||6.0||n||Y||Sony A99|
|Sony NEX-F3||optional||n||3.0||920||tilting||n||1/4000s||5.5||Y||n||Sony NEX-F3|
|Sony RX100||none||n||3.0||1229||fixed||n||1/2000s||10.0||Y||Y||Sony RX100|
|Sony NEX-3||optional||n||3.0||920||tilting||n||1/4000s||7.0||n||n||Sony NEX-3|
One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The A5100 has a touchscreen, while the A77 has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.Both cameras have an articulated rear screen that can be turned to be front-facing. This feature will be particularly appreciated by vloggers and photographers who are interested in taking selfies.
Concerning the storage of imaging data, both the A5100 and the A77 write their files to SDXC or Memory Stick PRO Duo cards. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.
For some imaging applications, the extent to which a camera can communicate with its environment can be an important aspect in the camera decision process. The table below provides an overview of the connectivity of the Sony Alpha A5100 and Sony Alpha SLT-A77 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
|Sony A5100||-||stereo||mono||-||-||micro||2.0||Y||Y||-||Sony A5100|
|Sony A77||Y||stereo||mono||Y||-||mini||2.0||-||-||-||Sony A77|
|Panasonic GH5||Y||stereo||mono||Y||Y||full||3.1||Y||-||Y||Panasonic GH5|
|Sony A9||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||Y||Sony A9|
|Sony RX100 IV||-||stereo||mono||-||-||micro||2.0||Y||Y||-||Sony RX100 IV|
|Sony A7 II||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||-||Sony A7 II|
|Sony A77 II||Y||stereo||mono||Y||-||mini||2.0||Y||Y||-||Sony A77 II|
|Sony A5000||-||stereo||mono||-||-||micro||2.0||Y||Y||-||Sony A5000|
|Sony A6000||Y||stereo||mono||-||-||micro||2.0||Y||Y||-||Sony A6000|
|Sony RX100 III||-||stereo||mono||-||-||micro||2.0||Y||Y||-||Sony RX100 III|
|Sony A3000||Y||stereo||mono||-||-||mini||2.0||-||-||-||Sony A3000|
|Sony NEX-3N||-||stereo||mono||-||-||micro||2.0||-||-||-||Sony NEX-3N|
|Sony RX100 II||Y||stereo||mono||-||-||micro||2.0||Y||Y||-||Sony RX100 II|
|Sony A99||Y||stereo||mono||Y||Y||mini||2.0||-||-||-||Sony A99|
|Sony NEX-F3||Y||stereo||mono||-||-||mini||2.0||-||-||-||Sony NEX-F3|
|Sony RX100||-||stereo||mono||-||-||micro||2.0||-||-||-||Sony RX100|
|Sony NEX-3||Y||stereo||mono||-||-||mini||2.0||-||-||-||Sony NEX-3|
It is notable that the A5100 offers wifi support, while the A77 does not. Wifi can be a very convenient means to transfer image data to an off-camera location.
Studio photographers will appreciate that the Sony A77 (unlike the A5100) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
Travel and landscape photographers will find it useful that the A77 has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.
The A5100 is a recent model that features in the current product line-up of Sony. In contrast, the A77 has been discontinued (but it can be found pre-owned on eBay). As a replacement in the same line of cameras, the A77 was succeeded by the Sony A77 II. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Sony website.
So what conclusions can be drawn? Which of the two cameras – the Sony A5100 or the Sony A77 – has the upper hand? Is one clearly better than the other? A synthesis of the relative strong points of each of the models is listed below.
Reasons to prefer the Sony Alpha A5100:
- Better low-light sensitivity: Requires less light for good images (0.7 stops ISO advantage).
- Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
- Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
- More compact: Is smaller (110x63mm vs 143x104mm) and thus needs less room in the bag.
- Less heavy: Is lighter (by 449g or 61 percent) and hence easier to carry around.
- Easier travel charging: Can be conveniently charged via its USB port.
- More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
- Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
- Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
- More affordable: Was introduced into a lower priced category (61 percent cheaper at launch).
- More modern: Reflects 2 years and 11 months of technical progress since the A77 launch.
Advantages of the Sony Alpha SLT-A77:
- Better sound: Can connect to an external microphone for higher quality sound recording.
- Easier framing: Has an electronic viewfinder for image composition and settings control.
- Easier setting verification: Features a control panel on top to check shooting parameters.
- More flexible LCD: Has a full-flex screen for odd-angle shots in portrait or landscape orientation.
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
- Faster burst: Shoots at higher frequency (12 vs 6 flaps/sec) to capture the decisive moment.
- Longer lasting: Gets more shots (470 versus 400) out of a single battery charge.
- Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
- Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
- Better lighting: Features a hotshoe and can thus hold and trigger an external flash gun.
- Easier geotagging: Features an internal GPS sensor to log localization data.
- Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
- More heavily discounted: Has been around for much longer (launched in August 2011).
If the count of relative strengths (bullet points above) is taken as a measure, the A77 emerges as the winner of the match-up (13 : 10 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding on a new camera. A professional wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports shooter. Hence, the decision which camera is best and worth buying is often a very personal one.
How about other alternatives? Do the specifications of the Sony A5100 and the Sony A77 place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera and Best DSLR Camera listings whether the two cameras rank among the cream of the crop.
In any case, while the comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the A5100 or the A77. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.
This is where reviews by experts come in. The table below provides a synthesis of the camera assessments of some of the best known photo-gear review sites (cameralabs, dpreview, ephotozine, imaging-resource, and photographyblog). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.
The above review scores should be interpreted with care, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.
Other camera comparisons
Did this review help to inform your camera decision process? In case you are interested in seeing how other cameras pair up, just make your choice using the following search menu. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.
Specifications: Sony A5100 vs Sony A77
Below is a side-by-side comparison of the specs of the two cameras to facilitate a quick review of their differences and common features.
|Camera Model||Sony A5100||Sony A77|
|Camera Type||Mirrorless system camera||Digital single lens reflex|
|Camera Lens||Sony E mount lenses||Sony A mount lenses|
|Launch Date||August 2014||August 2011|
|Launch Price||USD 549||USD 1399|
|Sensor Specs||Sony A5100||Sony A77|
|Sensor Format||APS-C Sensor||APS-C Sensor|
|Sensor Size||23.5 x 15.6 mm||23.5 x 15.6 mm|
|Sensor Area||366.6 mm2||366.6 mm2|
|Sensor Diagonal||28.2 mm||28.2 mm|
|Sensor Resolution||24 Megapixels||24 Megapixels|
|Image Resolution||6000 x 4000 pixels||6000 x 4000 pixels|
|Pixel Pitch||3.91 μm||3.91 μm|
|Pixel Density||6.55 MP/cm2||6.55 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||1080/60p Video||1080/60p Video|
|ISO Setting||100-25600 ISO||100-16000 ISO|
|ISO Boost||no Enhancement||50-25600 ISO|
|Image Processor||BIONZ X||BIONZ X|
|DXO Sensor Quality (score)||80||78|
|DXO Color Depth (bits)||23.8||24.0|
|DXO Dynamic Range (EV)||12.7||13.2|
|DXO Low Light (ISO)||1347||801|
|Screen Specs||Sony A5100||Sony A77|
|Viewfinder Type||No viewfinder||Electronic viewfinder|
|Viewfinder Field of View||100%|
|Viewfinder Resolution||2359k dots|
|Top-Level Screen||no Top Display||Control Panel|
|LCD Framing||Live View||Live View|
|Rear LCD Size||3.0 inch||3.0 inch|
|LCD Resolution||922k dots||921k dots|
|LCD Attachment||Tilting screen||Fully flexible screen|
|Touch Input||Touchscreen||no Touchscreen|
|Shooting Specs||Sony A5100||Sony A77|
|Autofocus System||On-Sensor Phase-detect||Phase-detect AF|
|Manual Focusing Aid||Focus Peaking||Focus Peaking|
|Max Shutter Speed (mechanical)||1/4000/s||1/8000/s|
|Continuous Shooting||6 shutter flaps/s||12 shutter flaps/s|
|Image Stabilization||Lens stabilization only||In-body stabilization|
|Fill Flash||Build-in Flash||Build-in Flash|
|Storage Medium||MS or SDXC cards||MS or SDXC cards|
|Second Storage Option||Single card slot||Single card slot|
|UHS card support||UHS-I||UHS-I|
|Connectivity Specs||Sony A5100||Sony A77|
|External Flash||no Hotshoe||Hotshoe|
|Studio Flash||no PC Sync||PC Sync socket|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||micro HDMI||mini HDMI|
|Microphone Port||no MIC socket||External MIC port|
|Wifi Support||Wifi built-in||no Wifi|
|Near-Field Communication||NFC built-in||no NFC|
|Geotagging||no internal GPS||GPS built-in|
|Body Specs||Sony A5100||Sony A77|
|Environmental Sealing||Not weather sealed||Weathersealed body|
|Battery Life (CIPA)||400 shots per charge||470 shots per charge|
|In-Camera Charging||USB charging||no USB charging|
110 x 63 x 36 mm
(4.3 x 2.5 x 1.4 in)
143 x 104 x 81 mm
(5.6 x 4.1 x 3.2 in)
|Camera Weight||283 g (10.0 oz)||732 g (25.8 oz)|
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