Nikon D7100 versus Sony A7 III
The Nikon D7100 and the Sony Alpha A7 III are two enthusiast cameras that were revealed to the public, respectively, in February 2013 and February 2018. The D7100 is a DSLR, while the A7 III is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (D7100) and a full frame (A7 III) sensor. Both cameras offer a resolution of 24 megapixel. 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: Nikon D7100 vs Sony A7 III
The physical size and weight of the Nikon D7100 and the Sony A7 III are illustrated in the side-by-side display below. Three successive views from the front, the top, and the rear are shown. All width, height and depth measures are rounded to the nearest millimeter. If you prefer, you can also use the toggle button to switch to a comparison in percentage terms (in this case, the camera on the left side – the D7100 – represents the basis for the calculations 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 III is notably smaller (16 percent) than the Nikon D7100. Moreover, the A7 III is markedly lighter (15 percent) than the D7100. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.
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. A larger imaging sensor will tend to go along with bigger and heavier lenses, although exceptions exist. You can find an overview of optics for the two cameras in the Nikon Lens Catalog (D7100) and the Sony FE Lens Catalog (A7 III). Mirrorless cameras, such as the A7 III, have moreover the advantage that they can use many lenses from other systems via adapters, as they have a relatively short flange to focal plane distance.
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
|Nikon D7100 (⇒ rgt)||5.4 in||4.2 in||3.0 in||27.0 oz||950||YES||2013||1,199||discont.||check|
|Sony A7 III (⇒ lft)||5.0 in||3.8 in||2.9 in||22.9 oz||610||YES||2018||1,999||latest||check|
|Canon 70D (⇒ lft | rgt)||5.5 in||4.1 in||3.1 in||26.6 oz||920||YES||2013||1,199||discont.||check|
|Nikon D7500 (⇒ lft | rgt)||5.4 in||4.1 in||2.9 in||25.4 oz||950||YES||2017||1,299||latest||check|
|Nikon D500 (⇒ lft | rgt)||5.8 in||4.5 in||3.2 in||30.3 oz||1240||YES||2016||1,999||latest||check|
|Nikon D7200 (⇒ lft | rgt)||5.4 in||4.2 in||3.0 in||27.0 oz||1110||YES||2015||1,199||discont.||check|
|Nikon D3300 (⇒ lft | rgt)||4.9 in||3.9 in||3.0 in||15.2 oz||700||no||2014||499||discont.||check|
|Nikon D750 (⇒ lft | rgt)||5.6 in||4.4 in||3.1 in||26.5 oz||1230||YES||2014||2,299||latest||check|
|Nikon D610 (⇒ lft | rgt)||5.6 in||4.4 in||3.2 in||30.0 oz||900||YES||2013||1,999||latest||check|
|Nikon D600 (⇒ lft | rgt)||5.6 in||4.4 in||3.2 in||30.0 oz||900||YES||2012||2,099||discont.||check|
|Nikon D7000 (⇒ lft | rgt)||5.2 in||4.1 in||3.0 in||27.5 oz||1050||YES||2010||1,499||discont.||check|
|Panasonic GH5 (⇒ lft | rgt)||5.5 in||3.9 in||3.4 in||25.6 oz||410||YES||2017||1,999||latest||check|
|Sony A9 (⇒ lft | rgt)||5.0 in||3.8 in||2.5 in||23.7 oz||650||YES||2017||4,499||latest||check|
|Sony A7S II (⇒ lft | rgt)||5.0 in||3.8 in||2.4 in||22.1 oz||370||YES||2015||2,999||latest||check|
|Sony A7 II (⇒ lft | rgt)||5.0 in||3.8 in||2.4 in||21.1 oz||350||YES||2014||1,999||discont.||check|
|Sony A7 (⇒ lft | rgt)||5.0 in||3.7 in||1.9 in||16.7 oz||340||YES||2013||1,699||discont.||check|
|Sony RX10 (⇒ lft | rgt)||5.1 in||3.5 in||4.0 in||28.7 oz||420||YES||2013||1,299||discont.||check|
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 D7100 was launched at a markedly lower price (by 40 percent) than the A7 III, which puts it into a different market segment. 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: Nikon D7100 vs Sony A7 III
The size of the sensor inside a digital camera is one of the key determinants 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. 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 Nikon D7100 features an APS-C sensor and the Sony A7 III a full frame sensor. The sensor area in the A7 III is 131 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.5 and 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
Even though the A7 III has a larger sensor, both cameras offer the same resolution of 24 megapixel. This implies that the A7 III has a lower pixel density and larger individual pixels (with a pixel pitch of 5.94μm versus 3.91μm for the D7100), which gives it a potential advantage in terms of light gathering capacity. In addition, the A7 III is much more recent (by 5 years) than the D7100, and its sensor will have benefitted from technological advances during this time. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.
For most cameras, data on sensor performance has been reported by DXO Mark. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. Of the two cameras under consideration, the A7 III offers substantially better image quality than the D7100 (overall score 13 points higher). The advantage is based on 0.8 bits higher color depth, 1 EV in additional dynamic range, and 1.6 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.
|Nikon D7100 (⇒ rgt)||APS-C||24.0||6000||4000||1080/60p||24.2||13.7||1256||83|
|Sony A7 III (⇒ lft)||Full Frame||24.0||6000||4000||4K/30p||25.0||14.7||3730||96|
|Canon 70D (⇒ lft | rgt)||APS-C||20.0||5472||3648||1080/30p||22.5||11.6||926||68|
|Nikon D7500 (⇒ lft | rgt)||APS-C||20.7||5568||3712||4K/30p||24.3||14.0||1483||86|
|Nikon D500 (⇒ lft | rgt)||APS-C||20.7||5568||3712||4K/30p||24.0||14.0||1324||83|
|Nikon D7200 (⇒ lft | rgt)||APS-C||24.0||6000||4000||1080/60p||24.5||14.6||1333||87|
|Nikon D3300 (⇒ lft | rgt)||APS-C||24.0||6000||4000||1080/60p||24.3||12.8||1385||82|
|Nikon D750 (⇒ lft | rgt)||Full Frame||24.2||6016||4016||1080/60p||24.8||14.5||2956||93|
|Nikon D610 (⇒ lft | rgt)||Full Frame||24.2||6016||4016||1080/30p||25.1||14.4||2925||94|
|Nikon D600 (⇒ lft | rgt)||Full Frame||24.2||6016||4016||1080/30p||25.1||14.2||2980||94|
|Nikon D7000 (⇒ lft | rgt)||APS-C||16.1||4928||3264||10800/24p||23.5||13.9||1167||80|
|Panasonic GH5 (⇒ lft | rgt)||Four Thirds||20.2||5184||3888||4K/60p||23.9||13.0||807||77|
|Sony A9 (⇒ lft | rgt)||Full Frame||24.0||6000||4000||4K/30p||24.9||13.3||3517||92|
|Sony A7S II (⇒ lft | rgt)||Full Frame||12.0||4240||2832||4K/30p||23.6||13.3||2993||85|
|Sony A7 II (⇒ lft | rgt)||Full Frame||24.0||6000||4000||1080/60p||24.9||13.6||2449||90|
|Sony A7 (⇒ lft | rgt)||Full Frame||24.0||6000||4000||1080/60p||24.8||14.2||2248||90|
|Sony RX10 (⇒ lft | rgt)||1-inch||20.0||5472||3648||1080/60p||22.9||12.6||474||69|
Many modern cameras are not only capable of taking still images, but can also record movies. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the A7 III provides a better video resolution than the D7100. It can shoot movie footage at 4K/30p, while the Nikon is limited to 1080/60p.
Feature comparison: Nikon D7100 vs Sony A7 III
Apart from body and sensor, cameras can and do differ across a variety of features. For example, the A7 III has an electronic viewfinder (2359k dots), while the D7100 has an optical one. Both systems have their advantages, with the electronic viewfinder making it possible to project supplementary shooting information into the framing view, whereas the optical viewfinder offers lag-free viewing and a very clear framing image. The following table reports on some other key feature differences and similarities of the Nikon D7100, the Sony A7 III, and comparable cameras. The full specs-sheets can be found in the camera manual or, for example, in the dpreview camera hub.
|Nikon D7100 (⇒ rgt)||optical||YES||3.2||1229||fixed||no||8000||6.0||12||no|
|Sony A7 III (⇒ lft)||2359||no||3.0||922||tilting||YES||8000||10||no||YES|
|Canon 70D (⇒ lft | rgt)||optical||YES||3.0||1040||swivel||YES||8000||7.0||12||no|
|Nikon D7500 (⇒ lft | rgt)||optical||YES||3.2||922||tilting||YES||8000||8.0||12||no|
|Nikon D500 (⇒ lft | rgt)||optical||YES||3.2||2359||tilting||YES||8000||10.0||no||no|
|Nikon D7200 (⇒ lft | rgt)||optical||YES||3.2||1229||fixed||no||8000||6.0||12||no|
|Nikon D3300 (⇒ lft | rgt)||optical||no||3.0||921||fixed||no||4000||5.0||12||no|
|Nikon D750 (⇒ lft | rgt)||optical||YES||3.2||1229||tilting||no||4000||6.0||12||no|
|Nikon D610 (⇒ lft | rgt)||optical||YES||3.2||921||fixed||no||4000||6.0||12||no|
|Nikon D600 (⇒ lft | rgt)||optical||YES||3.0||921||fixed||no||4000||5.5||12||no|
|Nikon D7000 (⇒ lft | rgt)||optical||YES||3.0||921||fixed||no||8000||6.0||12||no|
|Panasonic GH5 (⇒ lft | rgt)||3680||no||3.2||1620||swivel||YES||8000||12.0||no||YES|
|Sony A9 (⇒ lft | rgt)||3686||no||3.0||1440||tilting||YES||8000||20.0||no||YES|
|Sony A7S II (⇒ lft | rgt)||2400||no||3.0||1229||tilting||no||8000||5.0||no||YES|
|Sony A7 II (⇒ lft | rgt)||2400||no||3.0||1230||tilting||no||8000||5.0||no||YES|
|Sony A7 (⇒ lft | rgt)||2400||no||3.0||1230||tilting||no||8000||5.0||no||no|
|Sony RX10 (⇒ lft | rgt)||1440||YES||3.0||1229||tilting||no||3200||10.0||10.2||YES|
The A7 III is a current model that online retailers, such as amazon, will have in stock. In contrast, the D7100 has been discontinued (but it can be found pre-owned on eBay). As a replacement in the same line of cameras, the D7100 was succeeded by the Nikon D7200.
Review summary: Nikon D7100 vs Sony A7 III
So what conclusions can be drawn? Is there a clear favorite between the Nikon D7100 and the Sony A7 III? Below is a summary of the relative strengths of each of the two contestants.
Arguments in favor of the Nikon D7100:
- Brighter framing: Features an optical viewfinder for clear, lag-free composition.
- Easier setting verification: Has an LCD display on top to control shooting parameters.
- Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
- More detailed LCD: Has a higher resolution rear screen (1229k vs 922k dots).
- Longer lasting: Can take more shots (950 versus 610) on a single battery charge.
- Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
- More affordable: Was introduced into a lower priced category (40 percent cheaper at launch).
- More heavily discounted: Has been available for much longer (launched in February 2013).
Reasons to prefer the Sony Alpha A7 III:
- Better image quality: Scores substantially higher (13 points) in the DXO overall evaluation.
- More dynamic range: Captures a broader range of light and dark details (1 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (1.6 stops ISO advantage).
- Better video: Provides higher definition movie capture (4K/30p vs 1080/60p).
- More framing info: Has an electronic viewfinder that displays shooting data.
- More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
- Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
- Faster burst: Shoots at higher frequency (10 vs 6 flaps/sec) to capture the decisive moment.
- More compact: Is smaller (127x96mm vs 136x107mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight (by 115g or 15 percent) and is thus easier to take along.
- More legacy lens friendly: Can use many non-native lenses via adapters.
- Sharper images: Has stabilization technology build-in to reduce the impact of hand-shake.
- More modern: Reflects 5 years of technical progress since the D7100 launch.
If the number of relative strengths (bullet points above) is taken as a guide, the A7 III is the clear winner of the contest (13 : 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 the spec-sheets of cameras can offer a general idea of their imaging potential, it remains partial and cannot reveal, for example, the handling experience and imaging performance when actually working with the D7100 or the A7 III. 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 following table reports the overall rankings of the cameras as published by some of the major camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, photographyblog). The full reviews are available by clicking on the site logo in the table header.
|Nikon D7100 (⇒ rgt)||HiRec||85/100 Gold||4.5/5||5/5||4.5/5||2013||1,199||discont.||check|
|Sony A7 III (⇒ lft)||HiRec||89/100 Gold||5/5||..||5/5||2018||1,999||latest||check|
|Canon 70D (⇒ lft | rgt)||HiRec||83/100 Gold||4.5/5||4.5/5||5/5||2013||1,199||discont.||check|
|Nikon D7500 (⇒ lft | rgt)||HiRec||86/100 Silver||5/5||4.5/5||4.5/5||2017||1,299||latest||check|
|Nikon D500 (⇒ lft | rgt)||HiRec||91/100 Gold||4.5/5||5/5||5/5||2016||1,999||latest||check|
|Nikon D7200 (⇒ lft | rgt)||HiRec||84/100 Silver||4.5/5||4/5||4.5/5||2015||1,199||discont.||check|
|Nikon D3300 (⇒ lft | rgt)||Rec||77/100 Silver||4.5/5||4.5/5||4.5/5||2014||499||discont.||check|
|Nikon D750 (⇒ lft | rgt)||HiRec||90/100 Gold||4.5/5||5/5||4.5/5||2014||2,299||latest||check|
|Nikon D610 (⇒ lft | rgt)||HiRec||87/100 Gold||4.5/5||4.5/5||4.5/5||2013||1,999||latest||check|
|Nikon D600 (⇒ lft | rgt)||HiRec||87/100 Gold||5/5||4.5/5||4.5/5||2012||2,099||discont.||check|
|Nikon D7000 (⇒ lft | rgt)||-||80/100 Silver||4.5/5||5/5||4.5/5||2010||1,499||discont.||check|
|Panasonic GH5 (⇒ lft | rgt)||HiRec||85/100 Gold||4.5/5||5/5||5/5||2017||1,999||latest||check|
|Sony A9 (⇒ lft | rgt)||HiRec||89/100 Gold||5/5||5/5||5/5||2017||4,499||latest||check|
|Sony A7S II (⇒ lft | rgt)||Rec||-||4.5/5||5/5||5/5||2015||2,999||latest||check|
|Sony A7 II (⇒ lft | rgt)||Rec||82/100 Silver||4.5/5||5/5||5/5||2014||1,999||discont.||check|
|Sony A7 (⇒ lft | rgt)||HiRec||80/100 Silver||5/5||4.5/5||5/5||2013||1,699||discont.||check|
|Sony RX10 (⇒ lft | rgt)||Rec||80/100 Gold||4.5/5||4.5/5||4.5/5||2013||1,299||discont.||check|
Care should be taken when interpreting the review scores above, though. The ratings are only valid when refering to cameras in the same category and of the same age. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.
Other camera comparisons
Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, just make a corresponding selection in the search boxes below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting. If you cannot find the camera you are interested in, kindly get in touch, and I will try to add information on that model to the database.
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