Sony RX100 III versus Sony A7
The Sony Cyber-shot DSC-RX100 III and the Sony Alpha A7 are two digital cameras that were announced, respectively, in May 2014 and October 2013. The RX100 III is a fixed lens compact, while the A7 is a mirrorless interchangeable lens camera. The cameras are based on an one-inch (RX100 III) and a full frame (A7) sensor. The RX100 III has a resolution of 20 megapixel, whereas the A7 provides 24 MP. Read on to find out how these two cameras compare with respect to their size, their sensors, their features, and their reception by expert reviewers.
Body comparison: Sony RX100 III vs Sony A7
The physical size and weight of the Sony RX100 III and the Sony A7 are illustrated in the side-by-side display below. Three consecutive views from the front, the top, and the rear side are shown. All width, height and depth measures are rounded to the nearest millimeter. You can also toggle the display to switch to a percentage comparison if you prefer that the measures are being expressed in relative terms (in this case, the camera on the left – the RX100 III – represents the basis or 100 percent across all the size and weight measures).
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A7 is considerably larger (102 percent) than the Sony RX100 III. It is noteworthy in this context that the A7 is splash and dust-proof, while the RX100 III does not feature any corresponding weather-sealing.
The above size and weight comparisons are to some extent incomplete and possibly misleading, as the RX100 III has a lens build in, whereas the A7 is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup. You can find an overview of optics for the A7 and their specifications in the Sony FE Lens Catalog.
The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. If you want to switch the focus of the display and review another camera pair, just select a new right or left comparator from among the camera models in the table. Alternatively, you can also move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.
|Camera Body Specifications|
|Sony RX100 III»||4.0 in||2.3 in||1.6 in||10.2 oz||320||n||May 2014||799||-|
|Sony A7«||5.0 in||3.7 in||1.9 in||16.7 oz||340||Y||Oct 2013||1,699||-|
|Canon G5 X« »||4.4 in||3.0 in||1.7 in||12.5 oz||210||n||Oct 2015||799|
|Canon G7 X« »||4.1 in||2.4 in||1.6 in||10.7 oz||210||n||Sep 2014||699||-|
|Nikon D610« »||5.6 in||4.4 in||3.2 in||30.0 oz||900||Y||Oct 2013||1,999|
|Panasonic FZ1000« »||5.4 in||3.9 in||5.2 in||29.3 oz||360||n||Jun 2014||899||-|
|Panasonic GH4« »||5.2 in||3.7 in||3.3 in||19.8 oz||500||Y||Feb 2014||1,499||-|
|Ricoh GR II« »||4.6 in||2.5 in||1.4 in||8.9 oz||320||n||Jun 2015||699||-|
|Ricoh GR« »||4.6 in||2.4 in||1.4 in||8.6 oz||290||n||Apr 2013||799||-|
|Sony RX100 V« »||4.0 in||2.3 in||1.6 in||10.5 oz||220||n||Oct 2016||999|
|Sony RX100 IV« »||4.0 in||2.3 in||1.6 in||10.5 oz||280||n||Jun 2015||999||-|
|Sony A7 II« »||5.0 in||3.8 in||2.4 in||21.1 oz||350||Y||Nov 2014||1,999||-|
|Sony A7S« »||5.0 in||3.7 in||1.9 in||17.2 oz||380||Y||Apr 2014||2,499||-|
|Sony A5100« »||4.3 in||2.5 in||1.4 in||10.0 oz||400||n||Aug 2014||549|
|Sony A7R« »||5.0 in||3.7 in||1.9 in||16.4 oz||340||Y||Oct 2013||2,299||-|
|Sony RX100 II« »||4.0 in||2.3 in||1.5 in||9.9 oz||350||n||Jun 2013||749||-|
|Sony RX100« »||4.0 in||2.3 in||1.4 in||8.5 oz||330||n||Jun 2012||649||-|
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 RX100 III was launched at a lower price than the A7, despite having a lens build in. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. 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. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.
Sensor comparison: Sony RX100 III vs Sony A7
The size of the sensor inside a digital camera is one of the key determinants of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color depth than smaller pixel-units in a sensor of the same technological generation. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors tend to be more expensive and lead to bigger and heavier cameras and lenses.
Of the two cameras under consideration, the Sony RX100 III features an one-inch sensor and the Sony A7 a full frame sensor. The sensor area in the A7 is 638 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.7 and 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
With 24MP, the A7 offers a higher resolution than the RX100 III (20MP), but the A7 nevertheless has larger individual pixels (pixel pitch of 5.97μm versus 2.41μm for the RX100 III) due to its larger sensor. However, the RX100 III is a somewhat more recent model (by 6 months) than the A7, and its sensor might have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units.
Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. This service is based on lab testing and assigns an overall score to each camera sensor, as well as ratings for dynamic range ("DXO Landscape"), color depth ("DXO Portrait"), and low-light sensitivity ("DXO Sports"). Of the two cameras under consideration, the A7 offers substantially better image quality than the RX100 III (overall score 23 points higher). The advantage is based on 2.4 bits higher color depth, 1.9 EV in additional dynamic range, and 2.2 stops in additional low light sensitivity. 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 RX100 III»||1-inch||20.0||5472||3648||1080/60p||22.4||12.3||495||67|
|Sony A7«||Full Frame||24.0||6000||4000||1080/60p||24.8||14.2||2248||90|
|Canon G5 X« »||1-inch||20.0||5472||3648||1080/60p||-||-||-||-|
|Canon G7 X« »||1-inch||20.0||5472||3648||1080/60p||23.0||12.7||556||71|
|Nikon D610« »||Full Frame||24.2||6016||4016||1080/30p||25.1||14.4||2925||94|
|Panasonic FZ1000« »||1-inch||20.0||5472||3648||4K/30p||22.1||11.7||517||64|
|Panasonic GH4« »||Four Thirds||15.9||4608||3456||4K/30p||23.2||12.8||791||74|
|Ricoh GR II« »||APS-C||16.1||4928||3264||1080/30p||23.6||13.7||1078||80|
|Ricoh GR« »||APS-C||16.1||4928||3264||1080/30p||23.6||13.5||972||78|
|Sony RX100 V« »||1-inch||20.0||5472||3648||4K/30p||22.8||12.4||586||70|
|Sony RX100 IV« »||1-inch||20.0||5472||3648||4K/30p||22.8||12.6||591||70|
|Sony A7 II« »||Full Frame||24.0||6000||4000||1080/60p||24.9||13.6||2449||90|
|Sony A7S« »||Full Frame||12.0||4240||2832||1080/60p||23.9||13.2||3702||87|
|Sony A5100« »||APS-C||24.0||6000||4000||1080/60p||23.8||12.7||1347||80|
|Sony A7R« »||Full Frame||36.2||7360||4912||1080/60p||25.6||14.1||2746||95|
|Sony RX100 II« »||1-inch||20.0||5472||3648||1080/60p||22.5||12.4||483||67|
|Sony RX100« »||1-inch||20.0||5472||3648||1080/60p||22.6||12.4||390||66|
Many modern cameras cannot only take still pictures, but also record videos. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, and both provide the same movie specifications (1080/60p).
Feature comparison: Sony RX100 III vs Sony A7
Apart from body and sensor, cameras can and do differ across a variety of features. The two cameras under review are similar with respect to both having an electronic viewfinder. However, the one in the A7 offers a substantially higher resolution than the one in the RX100 III (2400k vs 1440k dots). The table below summarizes some of the other core capabilities of the Sony RX100 III and Sony A7 in connection with corresponding information for a sample of similar cameras. If you need more detail on the specs, you can find comprehensive listings, for example, in the dpreview camera hub.
|Sony RX100 III»||1440||n||3.0||1229||tilting||n||2000||10.0||Y||Y|
|Canon G5 X« »||2360||n||3.0||1040||swivel||Y||2000||5.9||Y||Y|
|Canon G7 X« »||-||n||3.0||1040||tilting||Y||2000||6.5||Y||Y|
|Nikon D610« »||optical||Y||3.2||921||fixed||n||4000||6.0||Y||n|
|Panasonic FZ1000« »||2359||n||3.0||921||swivel||n||4000||12.0||Y||Y|
|Panasonic GH4« »||2359||n||3.0||1036||swivel||Y||8000||12.0||Y||n|
|Ricoh GR II« »||-||n||3.0||1230||fixed||n||4000||4.0||Y||n|
|Ricoh GR« »||-||n||3.0||1230||fixed||n||4000||4.0||Y||n|
|Sony RX100 V« »||2359||n||3.0||1229||tilting||n||2000||24.0||Y||Y|
|Sony RX100 IV« »||2359||n||3.0||1228||tilting||n||2000||16.0||Y||Y|
|Sony A7 II« »||2400||n||3.0||1230||tilting||n||8000||5.0||n||Y|
|Sony A7S« »||2400||n||3.0||921||tilting||n||8000||5.0||n||n|
|Sony A5100« »||-||n||3.0||922||tilting||Y||4000||6.0||Y||n|
|Sony A7R« »||2400||n||3.0||1230||tilting||n||8000||4.0||n||n|
|Sony RX100 II« »||-||n||3.0||1229||tilting||n||2000||10.0||Y||Y|
|Sony RX100« »||-||n||3.0||1229||fixed||n||2000||10.0||Y||Y|
Both the RX100 III and the A7 have been discontinued, but can regularly be found used on eBay. The A7 was replaced by the Sony A7 II, while the RX100 III was followed by the Sony RX100 IV.
Review summary: Sony RX100 III vs Sony A7
So what conclusions can be drawn? Which of the two cameras – the Sony RX100 III or the Sony A7 – has the upper hand? A synthesis of the relative strong points of each of the models is listed below.
Reasons to prefer the Sony Cyber-shot DSC-RX100 III:
- Faster burst: Shoots at higher frequency (10 vs 5 flaps/sec) to capture the decisive moment.
- Ready to shoot: Has a lens build-in, whereas the A7 requires a separate lens.
- More compact: Is smaller (102x58mm vs 127x94mm) and thus needs less room in the bag.
- Less heavy: Is lighter even though it comes with a build-in lens (unlike the A7).
- Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
- Sharper images: Has hand-shake reducing image stabilization build-in.
- More affordable: Was introduced at a lower price, despite coming with a build-in lens.
- More modern: Is somewhat more recent (announced 6 months after the A7).
Advantages of the Sony Alpha A7:
- More detail: Has more megapixels (24 vs 20MP), which boosts linear resolution by 10%.
- Better image quality: Scores substantially higher (23 points) in the DXO overall evaluation.
- Richer colors: Generates noticeably more natural colors (2.4 bits more color depth).
- More dynamic range: Captures a broader range of light and dark details (1.9 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (2.2 stops ISO advantage).
- More detailed viewfinder: Has higher resolution electronic viewfinder (2400k vs 1440k dots).
- Faster shutter: Has higher mechanical shutter speed (8000/sec vs 2000/sec) to freeze action.
- More flexible: Takes interchangeable lenses and can thus be used with specialty optics.
- Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
- More heavily discounted: Has been on the market for longer (launched in October 2013).
If the count of relative strengths (bullet points above) is taken as a measure, the A7 emerges as the winner of the match-up (10 : 8 points). However, the pertinence of the various camera strengths will differ across photographers, so that you might want to weigh individual camera traits according to their importance for your own imaging needs before making a camera decision.
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 handling experience and imaging performance when actually working with the RX100 III or the A7. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate. This is where reviews by experts come in. The adjacent table relays the overall verdicts of several of the most popular camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, photographyblog). The detailed reviews can be accessed by clicking on the site logo in the table header.
|Sony RX100 III»||HiRec||82/100||4.5/5||4.5/5||5/5||May 2014||799||-|
|Sony A7«||HiRec||80/100||5/5||4.5/5||5/5||Oct 2013||1,699||-|
|Canon G5 X« »||HiRec||78/100||4.5/5||4/5||4.5/5||Oct 2015||799|
|Canon G7 X« »||HiRec||77/100||4.5/5||3.5/5||4.5/5||Sep 2014||699||-|
|Nikon D610« »||HiRec||87/100||4.5/5||4.5/5||4.5/5||Oct 2013||1,999|
|Panasonic FZ1000« »||HiRec||82/100||4.5/5||4.5/5||4.5/5||Jun 2014||899||-|
|Panasonic GH4« »||HiRec||85/100||5/5||5/5||5/5||Feb 2014||1,499||-|
|Ricoh GR II« »||-||-||4.5/5||4.5/5||4.5/5||Jun 2015||699||-|
|Ricoh GR« »||-||79/100||4.5/5||4.5/5||4.5/5||Apr 2013||799||-|
|Sony RX100 V« »||HiRec||83/100||4/5||5/5||4.5/5||Oct 2016||999|
|Sony RX100 IV« »||HiRec||85/100||4/5||4.5/5||4.5/5||Jun 2015||999||-|
|Sony A7 II« »||Rec||82/100||4.5/5||5/5||5/5||Nov 2014||1,999||-|
|Sony A7S« »||-||86/100||4.5/5||4.5/5||5/5||Apr 2014||2,499||-|
|Sony A5100« »||Rec||-||4.5/5||4.5/5||5/5||Aug 2014||549|
|Sony A7R« »||HiRec||82/100||4.5/5||5/5||5/5||Oct 2013||2,299||-|
|Sony RX100 II« »||HiRec||79/100||4.5/5||5/5||4.5/5||Jun 2013||749||-|
|Sony RX100« »||HiRec||78/100||4/5||5/5||5/5||Jun 2012||649||-|
The above review scores should be interpreted with care, though. The ratings are only valid when refering to cameras in the same category and of the same age. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. 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. If the camera you are interested in is not available, kindly get in touch, and I will try to add information on that model to the database.
- Canon 1300D vs Nikon D3300
- Canon 7D II vs Panasonic ZS100
- Canon 800D vs Canon 80D
- Canon G1 X Mark II vs Canon M100
- Fujifilm X-A5 vs Fujifilm X-A1
- Leica S Typ 006 vs Canon 200D
- Leica X Typ 113 vs Sony A7S
- Nikon D500 vs Panasonic TZ200
- Panasonic FZ330 vs Canon G9 X
- Panasonic G5 vs Sony A7S II
- Pentax K-3 II vs Pentax K-70
- Sony A7 III vs Fujifilm X100F