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Olympus E-510 versus Sony A77

The Olympus E-510 and the Sony Alpha SLT-A77 are two digital cameras that were officially introduced, respectively, in March 2007 and August 2011. Both are DSLR (Digital Single Lens Reflex) cameras that are based on a Four Thirds (E-510) and an APS-C sensor. The Olympus has a resolution of 10 megapixel, whereas the Sony provides 24 MP.

Body comparison

The physical size and weight of the Olympus E-510 and the Sony A77 are illustrated in the side-by-side display below. Three consecutive perspectives from the front, the top, and the back are presented. 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 E-510 – represents the basis or 100 percent across all the size and weight measures).

Olympus E-510 vs Sony A77 front
E-510 versus A77 top view
E-510 and A77 rear side
Body view (E-510 on the left)

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 larger (19 percent) than the Olympus E-510. Moreover, the A77 is substantially heavier (36 percent) than the E-510. It is noteworthy in this context that the A77 is splash and dust-proof, while the E-510 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 the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

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 comparisons there.

Camera Body Specifications
Camera Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(y/n)
Camera
Launch
(year)
Launch
Price
(USD)
Street
Price
(amazon)
Used
Price
(ebay)
Olympus E-510 (⇒ rgt) 136 mm 92 mm 68 mm 538 g 750 no 2007 799discont. check
Sony A77 (⇒ lft) 143 mm 104 mm 81 mm 732 g 470 YES 2011 1,999discont. check
Olympus E-M1 II (⇒ lft | rgt) 134 mm 91 mm 67 mm 574 g 440 YES 2016 1,999 latest check
Olympus E-620 (⇒ lft | rgt) 130 mm 94 mm 60 mm 521 g 500 no 2009 699discont. check
Olympus E-600 (⇒ lft | rgt) 130 mm 94 mm 60 mm 535 g 500 no 2009 449discont. check
Olympus E-420 (⇒ lft | rgt) 130 mm 91 mm 53 mm 440 g 500 no 2008 599discont. check
Olympus E-520 (⇒ lft | rgt) 136 mm 92 mm 68 mm 535 g 750 no 2008 699discont. check
Olympus E-30 (⇒ lft | rgt) 142 mm 108 mm 75 mm 701 g 750 no 2008 1,299discont. check
Olympus E-410 (⇒ lft | rgt) 130 mm 91 mm 53 mm 435 g 500 no 2007 699discont. check
Olympus E-3 (⇒ lft | rgt) 142 mm 116 mm 75 mm 876 g 750 YES 2007 1,699discont. check
Olympus E-400 (⇒ lft | rgt) 130 mm 91 mm 53 mm 435 g 500 no 2006 699discont. check
Olympus E-500 (⇒ lft | rgt) 130 mm 95 mm 66 mm 479 g 750 no 2005 599discont. check
Panasonic GH5 (⇒ lft | rgt) 139 mm 98 mm 87 mm 725 g 410 YES 2017 1,999 latest check
Panasonic L10 (⇒ lft | rgt) 135 mm 96 mm 78 mm 556 g 450 no 2007 599discont. check
Sony A7 II (⇒ lft | rgt) 127 mm 96 mm 60 mm 599 g 350 YES 2014 1,999 latest check
Sony A99 (⇒ lft | rgt) 147 mm 111 mm 78 mm 812 g 500 YES 2012 2,799discont. check
Sony A850 (⇒ lft | rgt) 156 mm 117 mm 82 mm 895 g 880 YES 2009 1,999discont. check

The listed prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The E-510 was launched at a markedly lower price (by 60 percent) than the A77, 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

The imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. All other things equal, a large sensor will have larger individual pixel-units that offer better low-light sensitivity, wider dynamic range, and 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 tent to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Olympus E-510 features a Four Thirds sensor and the Sony A77 an APS-C sensor. The sensor area in the A77 is 63 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.0 and 1.5. The sensor in the E-510 has a native 4:3 aspect ratio, while the one in the A77 offers a 3:2 aspect.

Olympus E-510 and Sony A77 sensor measures
Sensor size
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Sensor size

With 24MP, the A77 offers a higher resolution than the E-510 (10MP), but the A77 has smaller individual pixels (pixel pitch of 3.91μm versus 4.74μm for the E-510). Yet, the A77 is a much more recent model (by 4 years and 5 months) than the E-510, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units.

E-510 versus A77 MP
Sensor resolution
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Sensor resolution

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"). Of the two cameras under consideration, the A77 offers substantially better image quality than the E-510 (overall score 26 points higher). The advantage is based on 2.8 bits higher color depth, 3.2 EV in additional dynamic range, and 0.9 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.

Sensor Characteristics
Camera Sensor
Class
Resolution
(Megapixel)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Olympus E-510 (⇒ rgt) Four Thirds 10.0 3648 2736 no 21.2 10.0 442 52
Sony A77 (⇒ lft) APS-C 24.0 6000 4000 1080/60p 24 13.2 801 78
Olympus E-M1 II (⇒ lft | rgt) Four Thirds 20.2 5184 3888 4K/30p 23.7 12.8 1312 80
Olympus E-620 (⇒ lft | rgt) Four Thirds 12.2 4032 3024 no 21.3 10.3 536 55
Olympus E-600 (⇒ lft | rgt) Four Thirds 12.2 4032 3024 no 21.5 10.3 541 55
Olympus E-420 (⇒ lft | rgt) Four Thirds 10.0 3648 2736 no 21.5 10.4 527 56
Olympus E-520 (⇒ lft | rgt) Four Thirds 10.0 3648 2736 no 21.4 10.4 548 55
Olympus E-30 (⇒ lft | rgt) Four Thirds 12.2 4032 3024 no 21.3 10.4 530 55
Olympus E-410 (⇒ lft | rgt) Four Thirds 10.0 3648 2736 no 21.1 10.0 494 51
Olympus E-3 (⇒ lft | rgt) Four Thirds 10.0 3648 2736 no 21.6 10.5 571 56
Olympus E-400 (⇒ lft | rgt) Four Thirds 10.0 3648 2736 no - - - -
Olympus E-500 (⇒ lft | rgt) Four Thirds 8.0 3264 2448 no - - - -
Panasonic GH5 (⇒ lft | rgt) Four Thirds 20.2 5184 3888 4K/60p 23.9 13.0 807 77
Panasonic L10 (⇒ lft | rgt) Four Thirds 10.0 3648 2736 no 21.3 10.8 429 55
Sony A7 II (⇒ lft | rgt) Full Frame 24.0 6000 4000 1080/60p 24.9 13.6 2449 90
Sony A99 (⇒ lft | rgt) Full Frame 24.0 6000 4000 1080/60p 25.0 14.0 1555 89
Sony A850 (⇒ lft | rgt) Full Frame 24.4 6048 4032 no 23.8 12.2 1415 79

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 E-510 does not. The highest resolution format that the A77 can use is 1080/60p.

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the A77 has an electronic viewfinder (2359k dots), while the E-510 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 table below summarizes some of the other core capabilities of the Olympus E-510 and Sony A77 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.

Core Features
Camera Viewfinder
(Type or
'000 dots)
Control
Panel
(Y/n)
LCD
Size
(inch)
LCD
Resolution
('000 dots)
LCD
Attach-
ment
Touch
Screen
(Y/n)
Shutter
speed
(1/sec)
Shutter
flaps
(1/sec))
Build-in
Flash
(GN)
Build-in
Image
Stab
Olympus E-510 (⇒ rgt) optical no 2.5 215 fixed no 4000 3.0 12 YES
Sony A77 (⇒ lft) 2359 YES 3.0 921 full-flex no 8000 12.0 12 YES
Olympus E-M1 II (⇒ lft | rgt) 2360 no 3.0 1037 swivel YES 8000 18.0 no YES
Olympus E-620 (⇒ lft | rgt) optical no 2.7 230 swivel no 4000 4.0 12 YES
Olympus E-600 (⇒ lft | rgt) optical no 2.7 230 swivel no 4000 4.0 12 YES
Olympus E-420 (⇒ lft | rgt) optical no 2.7 215 fixed no 4000 3.5 12 no
Olympus E-520 (⇒ lft | rgt) optical no 2.7 215 fixed no 4000 3.5 12 YES
Olympus E-30 (⇒ lft | rgt) optical YES 2.7 230 swivel no 8000 5.0 13 YES
Olympus E-410 (⇒ lft | rgt) optical no 2.5 215 fixed no 4000 3.0 10 no
Olympus E-3 (⇒ lft | rgt) optical YES 2.5 230 swivel no 8000 5.0 13 YES
Olympus E-400 (⇒ lft | rgt) optical no 2.5 215 fixed no 4000 3.0 10 no
Olympus E-500 (⇒ lft | rgt) optical no 2.5 215 fixed no 4000 2.5 13 no
Panasonic GH5 (⇒ lft | rgt) 3680 no 3.2 1620 swivel YES 8000 12.0 no YES
Panasonic L10 (⇒ lft | rgt) optical no 2.5 207 swivel no 4000 3.0 11 no
Sony A7 II (⇒ lft | rgt) 2400 no 3.0 1230 tilting no 8000 5.0 no YES
Sony A99 (⇒ lft | rgt) 2359 YES 3.0 1229 full-flex no 8000 6.0 no YES
Sony A850 (⇒ lft | rgt) optical YES 3.0 922 fixed no 8000 3.0 no YES

Both the E-510 and the A77 have been discontinued, but can regularly be found used on ebay. The E-510 was replaced by the Olympus E-520, while the A77 was followed by the Sony A77 II.

Summary

So how do things add up? Is there a clear favorite between the Olympus E-510 and the Olympus E-510? The listing below highlights the relative strengths of the two models.


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Advantages of the Olympus E-510:

  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • More compact: Is smaller (136x92mm vs 143x104mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 194g or 27 percent) and hence easier to carry around.
  • Longer lasting: Can take more shots (750 versus 470) on a single battery charge.
  • More affordable: Was introduced into a lower priced category (60 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in March 2007).

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Reasons to prefer the Sony Alpha SLT-A77:

  • More detail: Has more megapixels (24 vs 10MP), which boosts linear resolution by 58%.
  • Better image quality: Scores substantially higher (26 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (2.8 bits more color depth).
  • More dynamic range: Captures a broader range of light and dark details (3.2 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (0.9 stops ISO advantage).
  • Broader imaging potential: Can capture not only stills but also 1080/60p video.
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • Easier setting verification: Has a control panel on top to check shooting parameters.
  • Larger screen: Has a bigger rear LCD (3.0" vs 2.5") for image review and settings control.
  • More detailed LCD: Has a higher resolution rear screen (921k vs 215k dots).
  • More flexible LCD: Has full-flex screen for odd-angle shots in portrait or landscape orientation.
  • Faster shutter: Has higher mechanical shutter speed (8000/sec vs 4000/sec) to freeze action.
  • Faster burst: Shoots at higher frequency (12 vs 3 flaps/sec) to capture the decisive moment.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • More modern: Reflects 4 years and 5 months of technical progress since the E-510 launch.

If the count of individual advantages (bullet points above) is taken as a guide, the A77 is the clear winner of the contest (15 : 6 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features.

E-510 06:15 A77

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 E-510 or the A77 handle or 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 hands-on reviews by experts are important. The adjacent table relays the overall verdicts of several of the most popular camera review sites. The detailed reviews can be accessed, respectively, on the websites of cameralabs.com, dpreview.com, ephotozine.com, imaging-resource.com, and photographyblog.com.

Review scores
Camera camera
labs
dp
review
ephoto
zine
imaging
resource
photography
blog
Camera
Launch
(year)
Launch
Price
(USD)
Street
Price
(amazon)
Used
Price
(ebay)
Olympus E-510 (⇒ rgt) 89/100 HiRec 3.5/5 reviewed 4.5/5 2007 799discont. check
Sony A77 (⇒ lft) 91/100 81/100 Silver - 4.5/5 5/5 2011 1,999discont. check
Olympus E-M1 II (⇒ lft | rgt) HiRec 85/100 Gold 4.5/5 5/5 4.5/5 2016 1,999 latest check
Olympus E-620 (⇒ lft | rgt) 88/100 72/100 HiRec 4.5/5 reviewed 5/5 2009 699discont. check
Olympus E-600 (⇒ lft | rgt) - - - - 4.5/5 2009 449discont. check
Olympus E-420 (⇒ lft | rgt) 85/100 HiRec 4/5 reviewed 4.5/5 2008 599discont. check
Olympus E-520 (⇒ lft | rgt) 87/100 HiRec 4.5/5 4/5 4.5/5 2008 699discont. check
Olympus E-30 (⇒ lft | rgt) - 71/100 HiRec 4.5/5 - 4/5 2008 1,299discont. check
Olympus E-410 (⇒ lft | rgt) 86/100 HiRec 4/5 reviewed 4.5/5 2007 699discont. check
Olympus E-3 (⇒ lft | rgt) 88/100 HiRec reviewed reviewed 4/5 2007 1,699discont. check
Olympus E-400 (⇒ lft | rgt) 85/100 - 4/5 - 4/5 2006 699discont. check
Olympus E-500 (⇒ lft | rgt) 76/100 HiRec - - - 2005 599discont. check
Panasonic GH5 (⇒ lft | rgt) HiRec 85/100 Gold 4.5/5 5/5 5/5 2017 1,999 latest check
Panasonic L10 (⇒ lft | rgt) 85/100 Rec 3.5/5 reviewed 4/5 2007 599discont. check
Sony A7 II (⇒ lft | rgt) Rec 82/100 Silver 4.5/5 5/5 5/5 2014 1,999 latest check
Sony A99 (⇒ lft | rgt) - 84/100 Gold 4.5/5 reviewed 4.5/5 2012 2,799discont. check
Sony A850 (⇒ lft | rgt) - 75/100 - 4/5 4.5/5 2009 1,999discont. check

Care should be taken when interpreting the review scores above, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. 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. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

Other comparisons

In case you are interested in seeing how other cameras pair up, 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 do not see the camera that you are looking for, please contact me, and I will try to locate and add the respective data to the application.

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