Canon EOS Rebel T7i vs Pentax 645D

In this comparison, we will evaluate the Canon EOS Rebel T7i and the Pentax 645D, highlighting the advantages of each over the other, discussing their pros and cons, shared strengths and weaknesses, and providing a rating based on their available features and specifications to assist you in choosing the one that best suits your needs.

Canon EOS Rebel T7i was introduced in February 2017 and Pentax 645D was introduced in March 2010. Let us first list highlights of the models.

Now that we've looked at the most essential specifications and gained a basic understanding of these cameras, we can delve into more details and see the differences between them.

This section shows those features and specifications which are the reason to choose Canon EOS Rebel T7i over Pentax 645D.

This section shows those features and specifications which are the reason to choose Pentax 645D over Canon EOS Rebel T7i.

We already listed pros and cons of each model. However, you may also find useful to look at their common strengths and weaknesses shown side-by-side.

Screen

Canon EOS Rebel T7i and Pentax 645D have 3.0" screens with 1,040k dot and 921k dot resolutions respectively. Canon EOS Rebel T7i has a Fully Articulated screen which makes it selfie and vlogger friendly and generally very useful for video shooting. Pentax 645D has a Fixed screen Canon EOS Rebel T7i also features touchscreen which has advantages such as easy menu navigation, intuitive controls, quick setting adjustment and most importantly a Touch-to-Focus functionality allowing users to select a specific point on the screen where they want the camera to focus. This feature can be helpful for achieving precise focus in both photo and video recording.

Viewfinder

Canon EOS Rebel T7i has a built-in Optical (pentamirror) viewfinderPentax 645D has a built-in Optical (pentaprism) viewfinder. Canon EOS Rebel T7i has 95% coverage with 0.82x (0.51x 35mm equivalent) magnification and Pentax 645D has 98% coverage with 0.56x (0.71x 35mm equivalent) magnification.

Canon EOS Rebel T7i features a 24.2 megapixel APS-C CMOS sensor with dimensions of 22.3 x 14.9 mm and a total area of 332.3 mm². Its native ISO range is 100 - 25,600 and expands to 100 - 51,200 in boosted mode. Pentax 645D features a 40 megapixel Medium format CCD sensor with dimensions of 44 x 33 mm and a total area of 1089 mm². Its native ISO range is 200 - 1,600 and expands to 100 - 1,600 in boosted mode.

Here is a sensor size comparison chart where you can see how different sensors compare with each other:

Sensor size chart

	Sensor	Dimensions	Area	Aspect Ratio	Crop Factor
	Medium Format	44 x 33 mm	1452 mm2	4:3	0.79x
	Full Frame	36 x 24 mm	864 mm2	3:2	1x
	APS-H	27 x 18 mm	486 mm2	3:2	1.3x
	APS-C	23.6 x 15.6 mm	368.2 mm2	3:2	1.5x
	APS-C (Canon)	22.3 x 14.9 mm	332.3 mm2	3:2	1.6x
	Micro Four Thirds	17.4 x 13 mm	226.2 mm2	4:3	2x
	1-inch	13.2 x 8.8 mm	116.2 mm2	3:2	2.7x
	1/1.7-inch	7.44 x 5.58 mm	41.5 mm2	4:3	4.7x
	1/2.3-inch	6.17 x 4.55 mm	28.1 mm2	4:3	5.6x

Canon EOS Rebel T7i is equipped with DIGIC 7 processor and can take pictures up to 6000 x 4000 resolution. Pentax 645D is equipped with PRIME II processor and can take pictures up to 7264 x 5440 resolution.

Lens Mount

Canon EOS Rebel T7i has Canon EF/EF-S lens mount and Pentax 645D has Pentax 645_AF2 lens mount. Due to APS-C sensor in Canon EOS Rebel T7i its crop factor is equal to 1.6x, this means that a 35mm equivalent focal length of the mounted lens will be equal to its actual focal length times 1.6. Due to Medium format sensor in Pentax 645D its crop factor is equal to 0.79x, this means that a 35mm equivalent focal length of the mounted lens will be equal to its actual focal length times 0.79.

No Low-Pass Filter on Pentax 645D

There is no optical low-pass filter (OLPF), also known as an anti-aliasing filter, in front of the sensor on Pentax 645D. This results in a slightly sharper image but may also introduce moiré patterns and aliasing artifacts when photographing subjects with fine, repetitive patterns or details.

No Image Stabilization

The cameras do not have image stabilization. On Canon EOS Rebel T7i it means that you need lenses with optical image stabilization for vibration reduction. As for Pentax 645D nothing can be done. On Pentax 645D it means that you need lenses with optical image stabilization for vibration reduction. As for Canon EOS Rebel T7i nothing can be done.

Built-in Wi-Fi on Canon EOS Rebel T7i

Canon EOS Rebel T7i has a built-in Wi-Fi which allows to easily transfer photos and videos from the camera to other Wi-Fi-enabled devices, such as smartphones, tablets, printers, or computers. This eliminates the need for cables and allows for quick and convenient media sharing and social media integration. It gives you the ability to control your camera remotely using a smartphone or tablet. This is particularly useful for taking self-portraits, group shots, or capturing images in challenging conditions without having to touch the camera. Firmware updates can also be downloaded and installed wirelessly.
  Check out the cameras in our database that have built-in WiFi.

Bluetooth on Canon EOS Rebel T7i

Canon EOS Rebel T7i has a built-in Bluetooth which lets you to connect the camera to a smartphone or a dedicated remote control device. This allows you to remotely trigger the camera, adjust settings and controls remotely through a paired mobile app. While Wi-Fi is generally faster for transferring larger files, Bluetooth can be used for small, selective transfers, it can provide real-time information about your camera's battery status, memory card capacity, and other key settings directly on your paired smartphone or smartwatch.
  Check out the cameras in our database that have built-in Bluetooth.

NFC on Canon EOS Rebel T7i

Canon EOS Rebel T7i has Near Field Communication (NFC) technology which simplifies the process of pairing it with other NFC-enabled devices like smartphones or tablets. It allows to quickly transfer photos and videos or remotely control the camera from compatible device. NFC can also be used for authentication and security purposes. It can verify your identity before accessing certain features or transferring sensitive data. It can be used with NFC-enabled accessories as well, such as lenses, flashes and GPS devices.

USB Inputs and HDMI Outputs

Both models have USB 2.0 (480 Mbit/sec) inputs for data transfer. connector for video signal output.

Battery

Canon EOS Rebel T7i comes with LP-E17 battery pack with battery life of 600 shots and Pentax 645D comes with D-LI90 battery pack with battery life of 800 shots.

External Storage Slots

Canon EOS Rebel T7i has a single SD/SDHC/SDXC (UHS-I) card slot. Pentax 645D has Dual SD/SDHC card slots.

Shutter

Canon EOS Rebel T7i has Electronic shutter and Mechanical Focal Plane shutter. Shutter speed can go up to 1/4000 sec on Canon EOS Rebel T7i, and up to 1/4000 sec on Pentax 645D. Canon EOS Rebel T7i can shoot continuously up to 6.0 fps. Pentax 645D can shoot continuously up to 1.1 fps.

Focusing

Canon EOS Rebel T7i has Dual Pixel CMOS AF system with 45 focusing points and Pentax 645D has 11 focusing points. Canon EOS Rebel T7i has detection range from -3 to +18 EV.

Exposure

Exposure meterings of Canon EOS Rebel T7i and Pentax 645D range from +1 to +20 EV and +2 to +21 EV respectively and you can set the exposure compensation within the ±5 EV range. You can also do exposure lock, exposure bracketing and manual exposure adjustment on Canon EOS Rebel T7i and exposure lock, exposure bracketing and manual exposure adjustment on Pentax 645D.

Flash

Canon EOS Rebel T7i has a built-in flash with maximum range of 12.00 m at ISO 100 and also accepts external flash which can be connected via Hot Shoe. Pentax 645D has no built-in flash but an external flash may be connected via Hot Shoe (P-TTL or high speed sync available) or wireless with PENTAX dedicated flash or X-sync socket. The fastest flash synchronization speed is 1/200 sec on Canon EOS Rebel T7i and 1/125 sec on Pentax 645D.

Canon EOS Rebel T7i body has dimensions of 131 x 100 x 76 mm (5.16 x 3.94 x 2.99") and Pentax 645D body has dimensions of 156 x 117 x 119 mm (6.14 x 4.61 x 4.69"). Canon EOS Rebel T7i weighs 532 g (1.17 lb / 18.77 oz) and Pentax 645D weighs 1480 g (3.26 lb / 52.21 oz).

Canon EOS Rebel T7i

Pentax 645D

131 mm

100 mm

156 mm

117 mm

100 mm

117 mm

76 mm

119 mm