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Olympus E-510 vs Pentax 645D

The Olympus E-510 and the Pentax 645D are two digital cameras that were revealed to the public, respectively, in March 2007 and March 2010. Both are DSLR (Digital Single Lens Reflex) cameras that are based on a Four Thirds (E-510) and a medium format (645D) sensor. The Olympus has a resolution of 10 megapixels, whereas the Pentax provides 39.5 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications
Olympus E-510 versus Pentax 645D
Olympus E-510 Pentax 645D
Digital single lens reflex Digital single lens reflex
Four Thirds lenses Pentax 645 mount lenses
10 MP, Four Thirds Sensor 39.5 MP, Medium Format Sensor
no Video no Video
ISO 100-1,600 ISO 100-1,600
Optical viewfinder Optical viewfinder
2.5 LCD, 215k dots 3.0 LCD, 921k dots
Fixed screen (not touch-sensitive) Fixed screen (not touch-sensitive)
3 shutter flaps per second 1.1 shutter flaps per second
In-body stabilizationLens stabilization only
not weather sealedWeathersealed body
750 shots per battery charge800 shots per battery charge
136 x 92 x 68 mm, 538 g 156 x 117 x 119 mm, 1480 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Olympus E-510 and the Pentax 645D? 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.

Body comparison

An illustration of the physical size and weight of the Olympus E-510 and the Pentax 645D is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All size dimensions are rounded to the nearest millimeter.

Size Olympus E-510 vs Pentax 645D
Compare E-510 versus 645D top
Comparison E-510 or 645D rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax 645D is considerably larger (46 percent) than the Olympus E-510. Moreover, the 645D is substantially heavier (175 percent) than the E-510. It is noteworthy in this context that the 645D 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 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 E-510 gets 750 shots out of its BLM-1 battery, while the 645D can take 800 images on a single charge of its D-LI90 power pack.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. If you would like to visualize and compare a different camera combination, just use the right or left arrows in the table to switch to the respective camera. Alternatively, you can also navigate to the CAM-parator app and make your selection from the full list of cameras there.

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Body Specifications
  Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life 1
Weather
Sealing
Camera
Launch 2
Launch
Price (USD)
Street
Price
 
Olympus E-510 5.4 in 3.6 in 2.7 in 19.0 oz 750 n Mar 2007 799i
 
Pentax 645D 6.1 in 4.6 in 4.7 in 52.2 oz 800 Y Mar 2010 9,995i
 
Canon 1D X 6.2 in 6.6 in 3.3 in 54.7 oz 1120 Y Oct 2011 6,799i
 
Canon 1D Mark IV 6.1 in 6.2 in 3.1 in 43.4 oz 1500 Y Oct 2009 4,999i
 
Leica S Typ 006 6.3 in 4.7 in 3.1 in 44.4 oz .. Y Sep 2012 21,950i
 
Nikon D3S 6.3 in 6.2 in 3.5 in 43.7 oz 4200 Y Oct 2009 5,199i
 
Olympus E-P3 4.8 in 2.7 in 1.3 in 13.0 oz 330 n Jun 2011 799i
 
Olympus E-600 5.1 in 3.7 in 2.4 in 18.9 oz 500 n Aug 2009 449i
 
Olympus E-620 5.1 in 3.7 in 2.4 in 18.4 oz 500 n Feb 2009 699i
 
Olympus E-P1 4.8 in 2.8 in 1.4 in 12.5 oz 300 n Jun 2009 799i
 
Olympus E-30 5.6 in 4.3 in 3.0 in 24.7 oz 750 n Nov 2008 1,299i
 
Olympus E-520 5.4 in 3.6 in 2.7 in 18.9 oz 750 n May 2008 699i
 
Olympus E-410 5.1 in 3.6 in 2.1 in 15.3 oz 500 n Mar 2007 699i
 
Olympus E-400 5.1 in 3.6 in 2.1 in 15.3 oz 500 n Sep 2006 699i
 
Olympus E-500 5.1 in 3.7 in 2.6 in 16.9 oz 750 n Sep 2005 599i
 
Panasonic L10 5.3 in 3.8 in 3.1 in 19.6 oz 450 n Aug 2007 599i
 
Pentax 645Z 6.1 in 4.6 in 4.8 in 54.7 oz 650 Y Apr 2014 8,499 i
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
(1) Number of images that can be taken on a full battery charge according to the CIPA-standard; (2) Official announcement.

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 E-510 was launched at a markedly lower price (by 92 percent) than the 645D, 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 size of the imaging sensor is a crucial determinant 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 tend to be more expensive and 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 Pentax 645D a medium format sensor. The sensor area in the 645D is 545 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.0 and 0.79. Both cameras feature a native aspect ratio (sensor width to sensor height) of 4:3.

Olympus E-510 and Pentax 645D sensor measures

With 39.5MP, the 645D offers a higher resolution than the E-510 (10MP), but the 645D nevertheless has larger individual pixels (pixel pitch of 6.06μm versus 4.74μm for the E-510) due to its larger sensor. Moreover, the 645D is a much more recent model (by 3 years) than the E-510, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixel-units. Coming back to sensor resolution, it should be mentioned that the 645D has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The resolution advantage of the Pentax 645D implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the 645D for good quality output (200 dots per inch) amounts to 36.3 x 27.2 inches or 92.3 x 69.1 cm, for very good quality (250 dpi) 29.1 x 21.8 inches or 73.8 x 55.3 cm, and for excellent quality (300 dpi) 24.2 x 18.1 inches or 61.5 x 46.1 cm. The corresponding values for the Olympus E-510 are 18.2 x 13.7 inches or 46.3 x 34.7 cm for good quality, 14.6 x 10.9 inches or 37.1 x 27.8 cm for very good quality, and 12.2 x 9.1 inches or 30.9 x 23.2 cm for excellent quality prints.

The Olympus E-510 has a native sensitivity range from ISO 100 to ISO 1600. The Pentax 645D offers exactly the same ISO settings.

E-510 versus 645D MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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 645D offers substantially better image quality than the E-510 (overall score 30 points higher). The advantage is based on 3.4 bits higher color depth, 2.6 EV in additional dynamic range, and 1.5 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.

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Sensor Characteristics
  Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
 
Olympus E-510 Four Thirds 10.0 3648 2736none21.210.044252
 
Pentax 645D Medium Format 39.5 7264 5440none24.612.6126282
 
Canon 1D X Full Frame 17.9 5184 34561080/30p23.811.8278682
 
Canon 1D Mark IV APS-H 16.0 4896 32641080/30p22.812.0132074
 
Leica S Typ 006 Medium Format 37.5 7500 5000none23.912.282476
 
Nikon D3S Full Frame 12.1 4256 2832720/24p23.512.0325382
 
Olympus E-P3 Four Thirds 12.2 4032 30241080/60i20.810.153651
 
Olympus E-600 Four Thirds 12.2 4032 3024none21.510.354155
 
Olympus E-620 Four Thirds 12.2 4032 3024none21.310.353655
 
Olympus E-P1 Four Thirds 12.2 4032 3024720/30p21.410.453655
 
Olympus E-30 Four Thirds 12.2 4032 3024none21.310.453055
 
Olympus E-520 Four Thirds 10.0 3648 2736none21.410.454855
 
Olympus E-410 Four Thirds 10.0 3648 2736none21.110.049451
 
Olympus E-400 Four Thirds 10.0 3648 2736none........
 
Olympus E-500 Four Thirds 8.0 3264 2448none........
 
Panasonic L10 Four Thirds 10.0 3648 2736none21.310.842955
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505101
The E-510 offers Live View, so that it can project the live image that the sensor receives onto the rear screen for framing. The 645D lacks this capability. Both cameras are still-image focused and cannot record videos.

Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. The E-510 and the 645D are similar in the sense that both have an optical viewfinder. The latter is useful for getting a clear image for framing even in brightly lit environments. The viewfinder in the 645D offers a wider field of view (98%) than the one in the E-510 (95%), so that a larger proportion of the captured image is visible in the finder. In addition, the viewfinder of the 645D has a higher magnification (0.78x vs 0.46x), 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 Olympus E-510 and Pentax 645D along with similar information for a selection of comparators.

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Core Features
  Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Size
(inch)
LCD
Resolution
(000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Mech
Shutter
Speed
Shutter
Flaps
(1/sec)
Built-in
Flash
(yes/no)
Built-in
Image
Stab
 
Olympus E-510optical n 2.5 215 fixed n 1/4000s 3.0 Y Y
 
Pentax 645Doptical Y 3.0 921 fixed n 1/4000s 1.1 n n
 
Canon 1D Xoptical Y 3.2 1040 fixed n 1/8000s 14.0 n n
 
Canon 1D Mark IVoptical Y 3.0 920 fixed n 1/8000s 10.0 n n
 
Leica S Typ 006optical Y 3.0 922 fixed n 1/4000s 1.5 n n
 
Nikon D3Soptical Y 3.0 921 fixed n 1/8000s 11.0 n n
 
Olympus E-P3optional n 3.0 614 fixed Y 1/4000s 3.0 Y Y
 
Olympus E-600optical n 2.7 230 swivel n 1/4000s 4.0 Y Y
 
Olympus E-620optical n 2.7 230 swivel n 1/4000s 4.0 Y Y
 
Olympus E-P1none n 3.0 230 fixed n 1/4000s 3.0 n Y
 
Olympus E-30optical Y 2.7 230 swivel n 1/8000s 5.0 Y Y
 
Olympus E-520optical n 2.7 215 fixed n 1/4000s 3.5 Y Y
 
Olympus E-410optical n 2.5 215 fixed n 1/4000s 3.0 Y n
 
Olympus E-400optical n 2.5 215 fixed n 1/4000s 3.0 Y n
 
Olympus E-500optical n 2.5 215 fixed n 1/4000s 2.5 Y n
 
Panasonic L10optical n 2.5 207 swivel n 1/4000s 3.0 Y n
 
Pentax 645Zoptical Y 3.2 1037 tilting n 1/4000s 3.0 n n

One difference between the cameras concerns the presence of an on-board flash. The E-510 has one, while the 645D does not. While the built-in flash of the E-510 is not very powerful, it can at times be useful as a fill-in light.

The Pentax 645D has an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.

The E-510 writes its imaging data to Compact Flash or xD Picture cards, while the 645D uses SDXC cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails.

Connectivity comparison

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 Olympus E-510 and Pentax 645D and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
  Camera
Model
Hotshoe
Port
Internal
Microphone
Internal
Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
 
Olympus E-510Y-----2.0---
 
Pentax 645DYstereo----2.0---
 
Canon 1D XYmono-Y-mini2.0---
 
Canon 1D Mark IVYstereo-Y-mini2.0---
 
Leica S Typ 006Y----mini2.0---
 
Nikon D3SYstereo---mini2.0---
 
Olympus E-P3Ystereo---mini2.0---
 
Olympus E-600Y-----2.0---
 
Olympus E-620Y-----2.0---
 
Olympus E-P1Ystereo---mini2.0---
 
Olympus E-30Y-----2.0---
 
Olympus E-520Y-----2.0---
 
Olympus E-410Y-----2.0---
 
Olympus E-400Y-----2.0---
 
Olympus E-500Y-----2.0---
 
Panasonic L10Y-----2.0---
 
Pentax 645ZYstereomonoY-mini3.0---

Studio photographers will appreciate that the Pentax 645D (unlike the E-510) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the E-510 and the 645D have been discontinued, but can regularly be found used on eBay. The E-510 was replaced by the Olympus E-520, while the 645D was followed by the Pentax 645Z. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Olympus and Pentax websites.

Review summary

So how do things add up? Which of the two cameras – the Olympus E-510 or the Pentax 645D – has the upper hand? Is one clearly better than the other? Below is a summary of the relative strengths of each of the two contestants.

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Arguments in favor of the Olympus E-510:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Faster burst: Shoots at higher frequency (3 vs 1.1 flaps/sec) to capture the decisive moment.
  • More compact: Is smaller (136x92mm vs 156x117mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 942g or 64 percent) and hence easier to carry around.
  • Sharper images: Has hand-shake reducing image stabilization built-in.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • More affordable: Was introduced into a lower priced category (92 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in March 2007).

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Advantages of the Pentax 645D:

  • More detail: Has more megapixels (39.5 vs 10MP), which boosts linear resolution by 99%.
  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • Better image quality: Scores substantially higher (30 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (3.4 bits more color depth).
  • More dynamic range: Captures a broader range of light and dark details (2.6 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (1.5 stops ISO advantage).
  • More complete view: Has a viewfinder with a larger field of view (98% vs 95%).
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.46x).
  • Easier setting verification: Features 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).
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • More modern: Reflects 3 years of technical progress since the E-510 launch.

If the number of relative strengths (bullet points above) is taken as a guide, the 645D is the clear winner of the contest (15 : 8 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 before making a decision 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.

E-510 08:15 645D

How about other alternatives? Do the specifications of the Olympus E-510 and the Pentax 645D 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 technical specifications can provide a useful overview of the capabilities of different cameras, it says little about, for example, the shooting experience and imaging performance of the E-510 and the 645D in practical situations. 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.

Expert reviews

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.

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Review Scores
  Camera
Model
camera
  labs  
dp
review  
ephoto
  zine  
imaging
resource
photography
  blog  
Camera
Launch
Launch
Price (USD)
Street
Price
 
Olympus E-51089/100+ +3.5/5o4.5/5 Mar 2007 799i
 
Pentax 645D......4.5/5.. Mar 2010 9,995i
 
Canon 1D X....4.5/54.5/54.5/5 Oct 2011 6,799i
 
Canon 1D Mark IV..89/100..5/5.. Oct 2009 4,999i
 
Leica S Typ 006.......... Sep 2012 21,950i
 
Nikon D3S..89/1004.5/55/55/5 Oct 2009 5,199i
 
Olympus E-P383/10074/1004.5/54.5/54.5/5 Jun 2011 799i
 
Olympus E-600........4.5/5 Aug 2009 449i
 
Olympus E-62088/10072/1004.5/5o5/5 Feb 2009 699i
 
Olympus E-P1+66/1004/54/54.5/5 Jun 2009 799i
 
Olympus E-30..71/1004.5/5..4/5 Nov 2008 1,299i
 
Olympus E-52087/100+ +4.5/54/54.5/5 May 2008 699i
 
Olympus E-41086/100+ +4/5o4.5/5 Mar 2007 699i
 
Olympus E-40085/100..4/5..4/5 Sep 2006 699i
 
Olympus E-50076/100+ +...... Sep 2005 599i
 
Panasonic L1085/100+3.5/5o4/5 Aug 2007 599i
 
Pentax 645Z....4.5/55/55/5 Apr 2014 8,499 i
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. Also, please note that some of the review sites have changed their methodology and reporting over time.

Olympus E-510:
Check Ebay offers
Pentax 645D:
Check Ebay offers

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. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.

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    Specifications: Olympus E-510 vs Pentax 645D

    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 Specifications
    Camera Model Olympus E-510 Pentax 645D
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Four Thirds lenses Pentax 645 mount lenses
    Launch Date March 2007 March 2010
    Launch Price USD 799 USD 9,995
    Sensor Specs Olympus E-510 Pentax 645D
    Sensor Technology CMOS CCD
    Sensor Format Four Thirds Sensor Medium Format Sensor
    Sensor Size 17.3 x 13.0 mm 44.0 x 33.0 mm
    Sensor Area 224.9 mm2 1452 mm2
    Sensor Diagonal 21.6 mm 55 mm
    Crop Factor 2.0x 0.79x
    Sensor Resolution 10 Megapixels 39.5 Megapixels
    Image Resolution 3648 x 2736 pixels 7264 x 5440 pixels
    Pixel Pitch 4.74 μm 6.06 μm
    Pixel Density 4.44 MP/cm2 2.72 MP/cm2
    Moiré control Anti-Alias filter no AA filter
    Movie Capability no Video no Video
    ISO Setting 100 - 1,600 ISO 100 - 1,600 ISO
    Image Processor TruePic III PRIME II
    DXO Sensor Quality (score) 52 82
    DXO Color Depth (bits) 21.2 24.6
    DXO Dynamic Range (EV) 10.0 12.6
    DXO Low Light (ISO) 442 1262
    Screen Specs Olympus E-510 Pentax 645D
    Viewfinder Type Optical viewfinder Optical viewfinder
    Viewfinder Field of View 95% 98%
    Viewfinder Magnification 0.46x 0.78x
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View
    Rear LCD Size 2.5inch 3.0inch
    LCD Resolution 215k dots 921k dots
    LCD Attachment Fixed screen Fixed screen
    Shooting Specs Olympus E-510 Pentax 645D
    Focus System Phase-detect AF Phase-detect AF
    Continuous Shooting 3 shutter flaps/s 1.1 shutter flaps/s
    Time-Lapse Photographyno IntervalometerIntervalometer built-in
    Image StabilizationIn-body stabilizationLens stabilization only
    Fill Flash Build-in Flash no On-Board Flash
    Storage Medium CF or XD cards SDXC cards
    Second Storage Option Dual card slots Dual card slots
    Connectivity Specs Olympus E-510 Pentax 645D
    External Flash Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 2.0 USB 2.0
    HDMI Port no HDMI no HDMI
    Wifi Support no Wifi no Wifi
    Body Specs Olympus E-510 Pentax 645D
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type BLM-1 D-LI90
    Battery Life (CIPA)750 shots per charge800 shots per charge
    Body Dimensions 136 x 92 x 68 mm
    (5.4 x 3.6 x 2.7 in)
    156 x 117 x 119 mm
    (6.1 x 4.6 x 4.7 in)
    Camera Weight 538 g (19.0 oz) 1480 g (52.2 oz)

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