Nikon D100 vs Sony A77
The Nikon D100 and the Sony Alpha SLT-A77 are two enthusiast cameras that were revealed to the public, respectively, in February 2002 and August 2011. Both are DSLR (Digital Single Lens Reflex) cameras that are equipped with an APS-C sensor. The Nikon has a resolution of 6 megapixels, whereas the Sony provides 24 MP.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.
Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon D100 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.
The physical size and weight of the Nikon D100 and the Sony A77 are illustrated 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 width, height and depth dimensions are rounded to the nearest millimeter.
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A77 is notably smaller (11 percent) than the Nikon D100. Moreover, the A77 is markedly lighter (6 percent) than the D100. It is noteworthy in this context that the A77 is splash and dust-proof, while the D100 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.
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, you can use the CAM-parator app to select your camera combination among a large number of options.
|1.||Nikon D100||144 mm||116 mm||81 mm||780 g||370||n||Feb 2002||1,999||ebay.com|
|2.||Sony A77||143 mm||104 mm||81 mm||732 g||470||Y||Aug 2011||1,399||ebay.com|
|3.||Canon 10D||150 mm||107 mm||75 mm||850 g||500||n||Feb 2003||1,999||ebay.com|
|4.||Nikon D90||132 mm||103 mm||77 mm||703 g||850||n||Aug 2008||1,299||ebay.com|
|5.||Nikon D300||147 mm||114 mm||74 mm||925 g||1000||Y||Aug 2007||1,799||ebay.com|
|6.||Nikon D40||124 mm||94 mm||64 mm||522 g||470||n||Nov 2006||499||ebay.com|
|7.||Nikon D80||132 mm||103 mm||77 mm||668 g||600||n||Aug 2006||999||ebay.com|
|8.||Nikon D50||133 mm||102 mm||76 mm||620 g||400||n||Apr 2005||749||ebay.com|
|9.||Nikon D70s||140 mm||111 mm||78 mm||679 g||500||n||Apr 2005||899||ebay.com|
|10.||Nikon D200||147 mm||113 mm||74 mm||920 g||400||Y||Nov 2005||1,699||ebay.com|
|11.||Nikon D70||140 mm||111 mm||78 mm||679 g||400||n||Jan 2004||999||ebay.com|
|12.||Nikon D1X||157 mm||153 mm||85 mm||1100 g||1200||Y||Feb 2001||5,999||ebay.com|
|13.||Pentax K-3||131 mm||100 mm||77 mm||800 g||560||Y||Oct 2013||1,299||ebay.com|
|14.||Sony A6500||120 mm||67 mm||53 mm||453 g||350||Y||Oct 2016||1,399||ebay.com|
|15.||Sony A7 II||127 mm||96 mm||60 mm||599 g||350||Y||Nov 2014||1,999||ebay.com|
|16.||Sony A77 II||143 mm||104 mm||81 mm||647 g||480||Y||May 2014||1,199||ebay.com|
|17.||Sony A99||147 mm||111 mm||78 mm||812 g||500||Y||Sep 2012||2,799||ebay.com|
|Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.|
Any camera decision will obviously take relative prices into account. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The A77 was launched at a markedly lower price (by 30 percent) than the D100, 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.
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. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better isolate a subject from the background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.
Both cameras under consideration feature an APS-C sensor, but their sensors differ slightly in size. The sensor area in the A77 is 1 percent smaller. They nevertheless have the same format factor of 1.5. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
Despite having a slightly smaller sensor, the A77 offers a higher resolution of 24 megapixels, compared with 6 MP of the D100. This megapixels advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.91μm versus 7.85μm for the D100). However, it should be noted that the A77 is much more recent (by 9 years and 6 months) than the D100, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently.
The resolution advantage of the Sony A77 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A77 for good quality output (200 dots per inch) amounts to 30 x 20 inches or 76.2 x 50.8 cm, for very good quality (250 dpi) 24 x 16 inches or 61 x 40.6 cm, and for excellent quality (300 dpi) 20 x 13.3 inches or 50.8 x 33.9 cm. The corresponding values for the Nikon D100 are 15 x 10 inches or 38.2 x 25.4 cm for good quality, 12 x 8 inches or 30.6 x 20.3 cm for very good quality, and 10 x 6.7 inches or 25.5 x 16.9 cm for excellent quality prints.
The Nikon D100 has a native sensitivity range from ISO 200 to ISO 800, which can be extended to ISO 200-1600. 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.
In terms of underlying technology, the D100 is build around a CCD sensor, while the A77 uses a CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.
For many cameras, data on sensor performance has been reported by DXO Mark. 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"). The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.
|15.||Sony A7 II||Full Frame||24.0||6000||4000||1080/60p||24.9||13.6||2449||90|
|16.||Sony A77 II||APS-C||24.0||6000||4000||1080/60p||23.5||12.7||1442||77|
|17.||Sony A99||Full Frame||24.0||6000||4000||1080/60p||25.0||14.0||1555||89|
|Note: DXO values in italics represent estimates based on sensor size and age.|
Many modern cameras are not only capable of taking still images, but can also record movies. The A77 indeed provides for movie recording, while the D100 does not. The highest resolution format that the A77 can use is 1080/60p.
Beyond body and sensor, cameras can and do differ across a range of features. For example, the A77 has an electronic viewfinder (2359k dots), while the D100 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 viewfinder in the A77 offers a wider field of view (100%) than the one in the D100 (95%), so that a larger proportion of the captured image is visible in the finder. In addition, the viewfinder of the A77 has a higher magnification (0.73x vs 0.53x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The adjacent table lists some of the other core features of the Nikon D100 and Sony A77 along with similar information for a selection of comparators.
|1.||Nikon D100||optical||Y||1.8 / 118||fixed||n||1/4000s||3.0/s||Y||n|
|2.||Sony A77||2359||Y||3.0 / 921||full-flex||n||1/8000s||12.0/s||Y||Y|
|3.||Canon 10D||optical||Y||1.8 / 118||fixed||n||1/4000s||3.0/s||Y||n|
|4.||Nikon D90||optical||Y||3.0 / 920||fixed||n||1/4000s||4.5/s||Y||n|
|5.||Nikon D300||optical||Y||3.0 / 922||fixed||n||1/8000s||6.0/s||Y||n|
|6.||Nikon D40||optical||n||2.5 / 230||fixed||n||1/4000s||2.5/s||Y||n|
|7.||Nikon D80||optical||n||2.5 / 230||fixed||n||1/4000s||3.0/s||Y||n|
|8.||Nikon D50||optical||n||2.0 / 130||fixed||n||1/4000s||2.5/s||Y||n|
|9.||Nikon D70s||optical||n||2.0 / 130||fixed||n||1/8000s||3.0/s||Y||n|
|10.||Nikon D200||optical||Y||2.5 / 230||fixed||n||1/8000s||5.0/s||Y||n|
|11.||Nikon D70||optical||n||1.8 / 130||fixed||n||1/8000s||3.0/s||Y||n|
|12.||Nikon D1X||optical||Y||2.0 / 120||fixed||n||1/16000s||3.0/s||n||n|
|13.||Pentax K-3||optical||Y||3.2 / 1037||fixed||n||1/8000s||8.3/s||Y||Y|
|14.||Sony A6500||2359||n||3.0 / 922||tilting||Y||1/4000s||11.0/s||Y||Y|
|15.||Sony A7 II||2400||n||3.0 / 1230||tilting||n||1/8000s||5.0/s||n||Y|
|16.||Sony A77 II||2359||Y||3.0 / 1229||full-flex||n||1/8000s||12.0/s||Y||Y|
|17.||Sony A99||2359||Y||3.0 / 1229||full-flex||n||1/8000s||6.0/s||n||Y|
|Notes: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.|
One feature that differentiates the A77 and the D100 is in-body image stabilization (IBIS). The A77 reduces the risk of handshake-induced blur with all attached lenses, while the D100 offers no blur reduction with lenses that themselves do not provide optical image stabilization.The A77 has an articulated screen that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in taking selfies. In contrast, the D100 does not have a selfie-screen.
The D100 writes its imaging data to Compact Flash cards, while the A77 uses SDXC or Memory Stick PRO Duo cards.
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 Nikon D100 and Sony Alpha SLT-A77 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
Mic / Speaker
|1.||Nikon D100||Y||- / -||-||-||-||1.1||-||-||-|
|2.||Sony A77||Y||stereo / mono||Y||-||mini||2.0||-||-||-|
|3.||Canon 10D||Y||- / -||-||-||-||1.1||-||-||-|
|4.||Nikon D90||Y||mono / mono||-||-||mini||2.0||-||-||-|
|5.||Nikon D300||Y||- / -||-||-||mini||2.0||-||-||-|
|6.||Nikon D40||Y||- / -||-||-||-||2.0||-||-||-|
|7.||Nikon D80||Y||- / -||-||-||-||2.0||-||-||-|
|8.||Nikon D50||Y||- / -||-||-||-||2.0||-||-||-|
|9.||Nikon D70s||Y||- / -||-||-||-||2.0||-||-||-|
|10.||Nikon D200||Y||- / -||-||-||-||2.0||-||-||-|
|11.||Nikon D70||Y||- / -||-||-||-||1.0||-||-||-|
|12.||Nikon D1X||Y||- / -||-||-||-||FW||-||-||-|
|13.||Pentax K-3||Y||mono / mono||Y||Y||mini||3.0||-||-||-|
|14.||Sony A6500||Y||stereo / mono||Y||-||micro||2.0||Y||Y||-|
|15.||Sony A7 II||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|16.||Sony A77 II||Y||stereo / mono||Y||-||mini||2.0||Y||Y||-|
|17.||Sony A99||Y||stereo / mono||Y||Y||mini||2.0||-||-||-|
Studio photographers will appreciate that the Sony A77 (unlike the D100) 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.
Both the D100 and the A77 have been discontinued, but can regularly be found used on ebay. The D100 was replaced by the Nikon D200, while the A77 was followed 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 Nikon and Sony websites.
So what conclusions can be drawn? Is the Nikon D100 better than the Sony A77 or vice versa? A synthesis of the relative strong points of each of the models is listed below.
Advantages of the Nikon D100:
- Brighter framing: Features an optical viewfinder for clear, lag-free composition.
- More heavily discounted: Has been available for much longer (launched in February 2002).
Arguments in favor of the Sony Alpha SLT-A77:
- More detail: Has more megapixels (24 vs 6MP), which boosts linear resolution by 100%.
- Broader imaging potential: Can capture not only stills but also 1080/60p video.
- More framing info: Has an electronic viewfinder that displays shooting data.
- More complete view: Has a viewfinder with a larger field of view (100% vs 95%).
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.73x vs 0.53x).
- Larger screen: Has a bigger rear LCD (3.0" vs 1.8") for image review and settings control.
- More detailed LCD: Has a higher resolution rear screen (921k vs 118k dots).
- More flexible LCD: Has a full-flex screen for odd-angle shots in portrait or landscape orientation.
- More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
- Faster burst: Shoots at higher frequency (12 vs 3 flaps/sec) to capture the decisive moment.
- More compact: Is smaller (143x104mm vs 144x116mm) and will fit more readily into a bag.
- Longer lasting: Gets more shots (470 versus 370) 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.
- Easier geotagging: Features an internal GPS sensor to log localization data.
- Faster data transfer: Supports a more advanced USB protocol (2.0 vs 1.1).
- Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
- More affordable: Was introduced into a lower priced category (30 percent cheaper at launch).
- More modern: Reflects 9 years and 6 months of technical progress since the D100 launch.
If the count of relative strengths (bullet points above) is taken as a measure, the A77 is the clear winner of the contest (20 : 2 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 wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro 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 Nikon D100 and the Sony A77 place the cameras among the top in their class? Find out in the latest Best DSLR Camera listing whether the two cameras rank among the cream of the crop.
In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains incomplete and does no justice, for example, to the way the D100 or the A77 perform in practice. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable.
This is why expert reviews are important. The adjacent summary-table relays the overall verdicts of several of the most popular camera review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). 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.
|1.||Nikon D100||..||..||..||+ +||o||..||Feb 2002||1,999||ebay.com|
|2.||Sony A77||5/5||91/100||..||81/100||..||5/5||Aug 2011||1,399||ebay.com|
|3.||Canon 10D||..||..||..||+ +||..||..||Feb 2003||1,999||ebay.com|
|4.||Nikon D90||..||+ +||..||+ +||4/5||4.5/5||Aug 2008||1,299||ebay.com|
|5.||Nikon D300||..||+ +||..||+ +||5/5||4.5/5||Aug 2007||1,799||ebay.com|
|6.||Nikon D40||..||81/100||..||+ +||o||4.5/5||Nov 2006||499||ebay.com|
|7.||Nikon D80||..||+||..||+ +||o||4.5/5||Aug 2006||999||ebay.com|
|8.||Nikon D50||..||78/100||..||+ +||4/5||4.5/5||Apr 2005||749||ebay.com|
|9.||Nikon D70s||..||..||..||..||..||5/5||Apr 2005||899||ebay.com|
|10.||Nikon D200||..||+ +||..||+ +||o||..||Nov 2005||1,699||ebay.com|
|11.||Nikon D70||..||..||..||+ +||..||..||Jan 2004||999||ebay.com|
|12.||Nikon D1X||..||..||..||+ +||..||..||Feb 2001||5,999||ebay.com|
|13.||Pentax K-3||4/5||..||..||83/100||5/5||5/5||Oct 2013||1,299||ebay.com|
|14.||Sony A6500||5/5||+ +||3.5/5||85/100||4.5/5||4.5/5||Oct 2016||1,399||ebay.com|
|15.||Sony A7 II||5/5||+||4/5||82/100||4.5/5||5/5||Nov 2014||1,999||ebay.com|
|16.||Sony A77 II||4/5||..||..||80/100||4.5/5||5/5||May 2014||1,199||ebay.com|
|17.||Sony A99||5/5||..||..||84/100||4.5/5||4.5/5||Sep 2012||2,799||ebay.com|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
The above review scores should be interpreted with care, though. The assessments were made in relation to similar cameras of the same technological generation. A score, therefore, has to be seen in close connection to the price and market introduction time 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. It should also be noted that some of the review sites have over time altered the way they render their verdicts.
Other camera comparisons
Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just make your choice using the following search menu. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.
- Canon 1100D vs Nikon D100
- Canon SX410 vs Sony A77
- Canon SX710 vs Sony A77
- Fujifilm X-E3 vs Nikon D100
- Leica D-LUX 5 vs Sony A77
- Leica S-E Typ 006 vs Nikon D100
- Nikon Coolpix A vs Nikon D100
- Nikon D100 vs Panasonic G7
- Nikon D100 vs Sony A7R III
- Nikon D70s vs Sony A77
- Nikon P900 vs Sony A77
- Panasonic FZ300 vs Sony A77
Specifications: Nikon D100 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||Nikon D100||Sony A77|
|Camera Type||Digital single lens reflex||Digital single lens reflex|
|Camera Lens||Nikon F mount lenses||Sony A mount lenses|
|Launch Date||February 2002||August 2011|
|Launch Price||USD 1,999||USD 1,399|
|Sensor Specs||Nikon D100||Sony A77|
|Sensor Format||APS-C Sensor||APS-C Sensor|
|Sensor Size||23.7 x 15.6 mm||23.5 x 15.6 mm|
|Sensor Area||369.72 mm2||366.6 mm2|
|Sensor Diagonal||28.4 mm||28.2 mm|
|Sensor Resolution||6 Megapixels||24 Megapixels|
|Image Resolution||3008 x 2000 pixels||6000 x 4000 pixels|
|Pixel Pitch||7.85 μm||3.91 μm|
|Pixel Density||1.63 MP/cm2||6.55 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||no Video||1080/60p Video|
|ISO Setting||200 - 800 ISO||100 - 16,000 ISO|
|ISO Boost||200 - 1,600 ISO||50 - 25,600 ISO|
|DXO Sensor Quality (score)||..||78|
|DXO Color Depth (bits)||..||24.0|
|DXO Dynamic Range (EV)||..||13.2|
|DXO Low Light (ISO)||..||801|
|Screen Specs||Nikon D100||Sony A77|
|Viewfinder Type||Optical viewfinder||Electronic viewfinder|
|Viewfinder Field of View||95%||100%|
|Viewfinder Resolution||2359k dots|
|Top-Level Screen||Control Panel||Control Panel|
|LCD Framing||Live View|
|Rear LCD Size||1.8inch||3.0inch|
|LCD Resolution||118k dots||921k dots|
|LCD Attachment||Fixed screen||Fully flexible screen|
|Shooting Specs||Nikon D100||Sony A77|
|Focus System||Phase-detect AF||Phase-detect AF|
|Manual Focusing Aid||no Peaking Feature||Focus Peaking|
|Max Shutter Speed (mechanical)||1/4000s||1/8000s|
|Continuous Shooting||3 shutter flaps/s||12 shutter flaps/s|
|Shutter Life Expectancy||50 000 actuations||150 000 actuations|
|Image Stabilization||Lens stabilization only||In-body stabilization|
|Fill Flash||Built-in Flash||Built-in Flash|
|Storage Medium||CF cards||MS or SDXC cards|
|Second Storage Option||Single card slot||Single card slot|
|Connectivity Specs||Nikon D100||Sony A77|
|Studio Flash||no PC Sync||PC Sync socket|
|USB Connector||USB 1.1||USB 2.0|
|HDMI Port||no HDMI||mini HDMI|
|Microphone Port||no MIC socket||External MIC port|
|Wifi Support||no Wifi||no Wifi|
|Geotagging||no internal GPS||GPS built-in|
|Body Specs||Nikon D100||Sony A77|
|Environmental Sealing||not weather sealed||Weathersealed body|
|Battery Life (CIPA)||370 shots per charge||470 shots per charge|
144 x 116 x 81 mm
(5.7 x 4.6 x 3.2 in)
143 x 104 x 81 mm
(5.6 x 4.1 x 3.2 in)
|Camera Weight||780 g (27.5 oz)||732 g (25.8 oz)|
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