Canon T2i vs Pentax 645D
The Canon EOS Rebel T2i (called Canon 550D in some regions) and the Pentax 645D are two digital cameras that were revealed to the public, respectively, in February 2010 and March 2010. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (T2i) and a medium format (645D) sensor. The Canon has a resolution of 17.9 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.
|Canon T2i||Pentax 645D|
|Digital single lens reflex||Digital single lens reflex|
|Canon EF mount lenses||Pentax 645 mount lenses|
|17.9 MP, APS-C Sensor||39.5 MP, Medium Format Sensor|
|1080/30p Video||no Video|
|ISO 100-6400 (100-12800)||ISO 100-1600|
|Optical viewfinder||Optical viewfinder|
|3.0" LCD, 1040k dots||3.0" LCD, 921k dots|
|Fixed screen (not touch-sensitive)||Fixed screen (not touch-sensitive)|
|3.7 shutter flaps per second||1.1 shutter flaps per second|
|Not weather sealed||Weathersealed body|
|440 shots per battery charge||800 shots per battery charge|
|129 x 98 x 62 mm, 530 g||156 x 117 x 119 mm, 1480 g|
Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS Rebel T2i 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.
The physical size and weight of the Canon T2i and the Pentax 645D are illustrated 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 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 Pentax 645D is considerably larger (44 percent) than the Canon T2i. Moreover, the 645D is substantially heavier (179 percent) than the T2i. It is noteworthy in this context that the 645D is splash and dust-proof, while the T2i 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 following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. In case you want to display and compare another camera duo, just click on the right or left arrow next to the camera that you would like to inspect. Alternatively, you can also use the CAM-parator to select your camera combination among a larger number of options.
|Canon T2i»||5.1 in||3.9 in||2.4 in||18.7 oz||440||n||Feb 2010||699||Canon T2i|
|Pentax 645D«||6.1 in||4.6 in||4.7 in||52.2 oz||800||Y||Mar 2010||9,995||Pentax 645D|
|Canon T100« »||5.1 in||4.0 in||3.0 in||15.4 oz||500||n||Feb 2018||399||Canon T100|
|Canon T6s« »||5.2 in||4.0 in||3.1 in||19.9 oz||440||n||Feb 2015||649||Canon T6s|
|Canon T5« »||5.1 in||3.9 in||3.1 in||16.9 oz||500||n||Feb 2014||449||Canon T5|
|Canon T5i« »||5.2 in||3.9 in||3.1 in||20.5 oz||440||n||Mar 2013||649||Canon T5i|
|Canon T4i« »||5.2 in||3.9 in||3.1 in||20.3 oz||440||n||Jun 2012||849||Canon T4i|
|Canon 1D X« »||6.2 in||6.6 in||3.3 in||54.7 oz||1120||Y||Oct 2011||6,799||Canon 1D X|
|Canon T3« »||5.1 in||3.9 in||3.1 in||17.5 oz||700||n||Feb 2011||449||Canon T3|
|Canon T3i« »||5.2 in||3.9 in||3.1 in||20.1 oz||440||n||Feb 2011||599||Canon T3i|
|Canon 1D Mark IV« »||6.1 in||6.2 in||3.1 in||43.4 oz||1500||Y||Oct 2009||4,999||Canon 1D Mark IV|
|Canon T1i« »||5.1 in||3.9 in||2.4 in||18.3 oz||400||n||Mar 2009||799||Canon T1i|
|Canon XSi« »||5.1 in||3.9 in||2.4 in||18.5 oz||500||n||Jan 2008||799||Canon XSi|
|Canon XTi« »||5.0 in||3.3 in||2.6 in||19.6 oz||370||n||Aug 2006||799||Canon XTi|
|Leica S Typ 006« »||6.3 in||4.7 in||3.1 in||44.4 oz||..||Y||Sep 2012||21,950||Leica S Typ 006|
|Nikon D3S« »||6.3 in||6.2 in||3.5 in||43.7 oz||4200||Y||Oct 2009||5,199||Nikon D3S|
|Pentax 645Z« »||6.1 in||4.6 in||4.8 in||54.7 oz||650||Y||Apr 2014||8,499||Pentax 645Z|
|Note: Measurements and pricing do not include easily detachable parts, such as interchangeable lenses or optional viewfinders.|
The price is, of course, an important factor in any camera decision. 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 T2i was launched at a markedly lower price (by 93 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.
The size of the imaging sensor is a crucial determinant 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. 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 associated with larger, more expensive camera bodies and lenses.
Of the two cameras under consideration, the Canon T2i features an APS-C sensor and the Pentax 645D a medium format sensor. The sensor area in the 645D is 337 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.6 and 0.79. The sensor in the T2i has a native 3:2 aspect ratio, while the one in the 645D offers a 4:3 aspect.
With 39.5MP, the 645D offers a higher resolution than the T2i (17.9MP), but the 645D nevertheless has larger individual pixels (pixel pitch of 6.06μm versus 4.31μm for the T2i) due to its larger sensor. It is noteworthy in this context that the two cameras were released in close succession, so that their sensors are from the same technological generation. 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 inch or 92.3 x 69.1 cm, for very good quality (250 dpi) 29.1 x 21.8 inch or 73.8 x 55.3 cm, and for excellent quality (300 dpi) 24.2 x 18.1 inch or 61.5 x 46.1 cm. The corresponding values for the Canon T2i are 25.9 x 17.3 inch or 65.8 x 43.9 cm for good quality, 20.7 x 13.8 inch or 52.7 x 35.1 cm for very good quality, and 17.3 x 11.5 inch or 43.9 x 29.3 cm for excellent quality prints.
The Canon EOS Rebel T2i has a native sensitivity range from ISO 100 to ISO 6400, which can be extended to ISO 100-12800. The corresponding ISO settings for the Pentax 645D are ISO 100 to ISO 1600 (no boost).
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 645D offers substantially better image quality than the T2i (overall score 16 points higher). The advantage is based on 2.5 bits higher color depth, 1.1 EV in additional dynamic range, and 0.7 stops in additional low light sensitivity. The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.
|Canon T2i||APS-C||17.9||5184||3456||1080/30p||22.1||11.5||784||66||Canon T2i|
|Pentax 645D||Medium Format||39.5||7264||5440||none||24.6||12.6||1262||82||Pentax 645D|
|Canon T100||APS-C||17.9||5184||3456||1080/30p||21.9||11.4||695||63||Canon T100|
|Canon T6s||APS-C||24.0||6000||4000||1080/30p||22.6||12.0||915||70||Canon T6s|
|Canon T5||APS-C||17.9||5184||3456||1080/30p||21.9||11.3||724||63||Canon T5|
|Canon T5i||APS-C||17.9||5184||3456||1080/30p||21.7||11.2||681||61||Canon T5i|
|Canon T4i||APS-C||17.9||5184||3456||1080/30p||21.7||11.2||722||62||Canon T4i|
|Canon 1D X||Full Frame||17.9||5184||3456||1080/30p||23.8||11.8||2786||82||Canon 1D X|
|Canon T3||APS-C||12.2||4272||2848||720/30p||21.9||11.0||755||62||Canon T3|
|Canon T3i||APS-C||17.9||5184||3456||1080/30p||22.1||11.5||793||65||Canon T3i|
|Canon 1D Mark IV||APS-H||16.0||4896||3264||1080/30p||22.8||12.0||1320||74||Canon 1D Mark IV|
|Canon T1i||APS-C||15.1||4752||3168||1080/20p||21.7||11.5||663||63||Canon T1i|
|Canon XSi||APS-C||12.2||4272||2848||none||21.9||10.8||692||61||Canon XSi|
|Canon XTi||APS-C||10.1||3888||2592||none||22.1||11.0||664||62||Canon XTi|
|Leica S Typ 006||Medium Format||37.5||7500||5000||none||23.9||12.2||824||76||Leica S Typ 006|
|Nikon D3S||Full Frame||12.1||4256||2832||720/24p||23.5||12.0||3253||82||Nikon D3S|
|Pentax 645Z||Medium Format||51.1||8256||6192||1080/60i||26.0||14.7||4505||101||Pentax 645Z|
Many modern cameras are not only capable of taking still images, but also of capturing video footage. The T2i indeed provides movie recording capabilities, while the 645D does not. The highest resolution format that the T2i can use is 1080/30p.
Beyond body and sensor, cameras can and do differ across a range of features. The T2i 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 T2i (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 0.54x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The following table reports on some other key feature differences and similarities of the Canon T2i, the Pentax 645D, and comparable cameras.
|Canon T2i||optical||n||3.0||1040||fixed||n||1/4000s||3.7||Y||n||Canon T2i|
|Pentax 645D||optical||Y||3.0||921||fixed||n||1/4000s||1.1||n||n||Pentax 645D|
|Canon T100||optical||n||2.7||230||fixed||n||1/4000s||3.0||Y||n||Canon T100|
|Canon T6s||optical||Y||3.0||1040||swivel||Y||1/4000s||5.0||Y||n||Canon T6s|
|Canon T5||optical||n||3.0||460||fixed||n||1/4000s||3.0||Y||n||Canon T5|
|Canon T5i||optical||n||3.0||1040||swivel||Y||1/4000s||5.0||Y||n||Canon T5i|
|Canon T4i||optical||n||3.0||1040||swivel||Y||1/4000s||5.0||Y||n||Canon T4i|
|Canon 1D X||optical||Y||3.2||1040||fixed||n||1/8000s||14.0||n||n||Canon 1D X|
|Canon T3||optical||n||2.7||230||fixed||n||1/4000s||3.0||Y||n||Canon T3|
|Canon T3i||optical||n||3.0||1040||swivel||n||1/4000s||3.7||Y||n||Canon T3i|
|Canon 1D Mark IV||optical||Y||3.0||920||fixed||n||1/8000s||10.0||n||n||Canon 1D Mark IV|
|Canon T1i||optical||n||3.0||920||fixed||n||1/4000s||3.4||Y||n||Canon T1i|
|Canon XSi||optical||n||3.0||230||fixed||n||1/4000s||3.5||Y||n||Canon XSi|
|Canon XTi||optical||n||2.5||230||fixed||n||1/4000s||3.0||Y||n||Canon XTi|
|Leica S Typ 006||optical||Y||3.0||922||fixed||n||1/4000s||1.5||n||n||Leica S Typ 006|
|Nikon D3S||optical||Y||3.0||921||fixed||n||1/8000s||11.0||n||n||Nikon D3S|
|Pentax 645Z||optical||Y||3.2||1037||tilting||n||1/4000s||3.0||n||n||Pentax 645Z|
One difference between the cameras concerns the presence of an on-board flash. The T2i has one, while the 645D does not. While the built-in flash of the T2i 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.
Concerning the storage of imaging data, both the T2i and the 645D write their files to SDXC cards. The 645D features dual card slots, which can be very useful in case a memory card fails. In contrast, the T2i only has one slot.
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 Canon EOS Rebel T2i and Pentax 645D and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
|Canon T2i||Y||stereo||none||Y||-||mini||2.0||-||-||-||Canon T2i|
|Pentax 645D||Y||stereo||none||-||-||none||2.0||-||-||-||Pentax 645D|
|Canon T100||Y||mono||mono||-||-||mini||2.0||Y||Y||-||Canon T100|
|Canon T6s||Y||stereo||mono||Y||-||mini||2.0||Y||Y||-||Canon T6s|
|Canon T5||Y||mono||mono||-||-||mini||2.0||-||-||-||Canon T5|
|Canon T5i||Y||stereo||mono||Y||-||mini||2.0||-||-||-||Canon T5i|
|Canon T4i||Y||stereo||mono||Y||-||mini||2.0||-||-||-||Canon T4i|
|Canon 1D X||Y||mono||none||Y||-||mini||2.0||-||-||-||Canon 1D X|
|Canon T3||Y||stereo||mono||-||-||mini||2.0||-||-||-||Canon T3|
|Canon T3i||Y||mono||mono||Y||-||mini||2.0||-||-||-||Canon T3i|
|Canon 1D Mark IV||Y||stereo||none||Y||-||mini||2.0||-||-||-||Canon 1D Mark IV|
|Canon T1i||Y||mono||mono||-||-||mini||2.0||-||-||-||Canon T1i|
|Canon XSi||Y||none||none||-||-||mini||2.0||-||-||-||Canon XSi|
|Canon XTi||Y||none||none||-||-||none||2.0||-||-||-||Canon XTi|
|Leica S Typ 006||Y||none||none||-||-||mini||2.0||-||-||-||Leica S Typ 006|
|Nikon D3S||Y||stereo||none||-||-||mini||2.0||-||-||-||Nikon D3S|
|Pentax 645Z||Y||stereo||mono||Y||-||mini||3.0||-||-||-||Pentax 645Z|
Studio photographers will appreciate that the Pentax 645D (unlike the T2i) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
Both the T2i and the 645D have been discontinued, but can regularly be found used on eBay. The T2i was replaced by the Canon T3i, 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 Canon and Pentax websites.
So how do things add up? Which of the two cameras – the Canon T2i or the Pentax 645D – has the upper hand? Is one clearly better than the other? A synthesis of the relative strong points of each of the models is listed below.
Arguments in favor of the Canon EOS Rebel T2i:
- Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
- Broader imaging potential: Can record not only still images but also 1080/30p movies.
- More detailed LCD: Has a higher resolution rear screen (1040k vs 921k dots).
- Faster burst: Shoots at higher frequency (3.7 vs 1.1 flaps/sec) to capture the decisive moment.
- More compact: Is smaller (129x98mm vs 156x117mm) and thus needs less room in the bag.
- Less heavy: Is lighter (by 950g or 64 percent) and hence easier to carry around.
- Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
- More affordable: Was introduced into a lower priced category (93 percent cheaper at launch).
Reasons to prefer the Pentax 645D:
- More detail: Has more megapixels (39.5 vs 17.9MP), which boosts linear resolution by 46%.
- Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
- Better image quality: Scores substantially higher (16 points) in the DXO overall evaluation.
- Richer colors: Generates noticeably more natural colors (2.5 bits more color depth).
- More dynamic range: Captures a broader range of light and dark details (1.1 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (0.7 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 0.54x).
- Easier setting verification: Features a control panel on top to check shooting parameters.
- Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
- Longer lasting: Gets more shots (800 versus 440) out of a single battery charge.
- 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.
- Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
If the count of individual advantages (bullet points above) is taken as a guide, the 645D is the clear winner of the contest (14 : 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. 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 Canon T2i 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 specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the T2i or the 645D. 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 where reviews by experts come in. The adjacent summary-table relays the overall verdicts of several of the most popular camera 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.
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. 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, 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 your choice using the following search menu. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.
- Canon 750D vs Pentax 645D
- Canon T2i vs Panasonic GM1
- Canon T2i vs Sony A6100
- Canon T2i vs Sony NEX-6
- Fujifilm GFX 50R vs Pentax 645D
- Fujifilm X-T20 vs Pentax 645D
- Nikon B500 vs Pentax 645D
- Nikon D700 vs Pentax 645D
- Nikon D750 vs Pentax 645D
- Olympus E-P1 vs Pentax 645D
- Panasonic GX850 vs Pentax 645D
- Pentax 645D vs Sony HX400V
Specifications: Canon T2i 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 Model||Canon T2i||Pentax 645D|
|Camera Type||Digital single lens reflex||Digital single lens reflex|
|Camera Lens||Canon EF mount lenses||Pentax 645 mount lenses|
|Launch Date||February 2010||March 2010|
|Launch Price||USD 699||USD 9995|
|Sensor Specs||Canon T2i||Pentax 645D|
|Sensor Format||APS-C Sensor||Medium Format Sensor|
|Sensor Size||22.3 x 14.9 mm||44.0 x 33.0 mm|
|Sensor Area||332.27 mm2||1452 mm2|
|Sensor Diagonal||26.8 mm||55 mm|
|Sensor Resolution||17.9 Megapixels||39.5 Megapixels|
|Image Resolution||5184 x 3456 pixels||7264 x 5440 pixels|
|Pixel Pitch||4.31 μm||6.06 μm|
|Pixel Density||5.39 MP/cm2||2.72 MP/cm2|
|Moiré control||Anti-Alias filter||no AA filter|
|Movie Capability||1080/30p Video||no Video|
|ISO Setting||100-6400 ISO||100-1600 ISO|
|ISO Boost||100-12800 ISO||no Enhancement|
|Image Processor||DIGIC 4||PRIME II|
|DXO Sensor Quality (score)||66||82|
|DXO Color Depth (bits)||22.1||24.6|
|DXO Dynamic Range (EV)||11.5||12.6|
|DXO Low Light (ISO)||784||1262|
|Screen Specs||Canon T2i||Pentax 645D|
|Viewfinder Type||Optical viewfinder||Optical viewfinder|
|Viewfinder Field of View||95%||98%|
|Top-Level Screen||no Top Display||Control Panel|
|LCD Framing||Live View|
|Rear LCD Size||3.0 inch||3.0 inch|
|LCD Resolution||1040k dots||921k dots|
|LCD Attachment||Fixed screen||Fixed screen|
|Shooting Specs||Canon T2i||Pentax 645D|
|Autofocus System||Phase-detect AF||Phase-detect AF|
|Continuous Shooting||3.7 shutter flaps/s||1.1 shutter flaps/s|
|Shutter Life Expectancy||100 000 actuations||50 000 actuations|
|Time-Lapse Photography||no Intervalometer||Intervalometer built-in|
|Fill Flash||Build-in Flash||no On-Board Flash|
|Storage Medium||SDXC cards||SDXC cards|
|Second Storage Option||Single card slot||Dual card slots|
|UHS card support||no||no|
|Connectivity Specs||Canon T2i||Pentax 645D|
|Studio Flash||no PC Sync||PC Sync socket|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||mini HDMI||no HDMI|
|Microphone Port||External MIC port||no MIC socket|
|Wifi Support||no Wifi||no Wifi|
|Body Specs||Canon T2i||Pentax 645D|
|Environmental Sealing||Not weather sealed||Weathersealed body|
|Battery Life (CIPA)||440 shots per charge||800 shots per charge|
129 x 98 x 62 mm
(5.1 x 3.9 x 2.4 in)
156 x 117 x 119 mm
(6.1 x 4.6 x 4.7 in)
|Camera Weight||530 g (18.7 oz)||1480 g (52.2 oz)|
Did you notice an error on this page? If so, please get in touch, so that we can correct the information.