K R vs. Pentax 645D

What's the Difference?

The K R and Pentax 645D are both digital cameras manufactured by Pentax, but they cater to different photography needs. The K R is a compact DSLR camera designed for entry-level photographers, offering a 12.4-megapixel sensor, 720p HD video recording, and a range of creative shooting modes. On the other hand, the Pentax 645D is a medium format camera aimed at professional photographers, featuring a 40-megapixel sensor, weather-sealed body, and exceptional image quality. While the K R is more affordable and suitable for everyday photography, the Pentax 645D is a high-end option for those seeking superior resolution and advanced features in their images.


AttributeK RPentax 645D
ModelK R645D
Camera TypeDSLRMedium Format
Sensor SizeAPS-CMedium Format (44x33mm)
Resolution12.4 MP40 MP
ISO Range100-25600100-1600 (expandable to 100-12800)
Image StabilizationIn-body Shake ReductionIn-body Shake Reduction
Autofocus System11-point AF system11-point AF system
Viewfinder TypePentamirrorPentaprism
Continuous Shooting Speed6 fps1.1 fps

Further Detail


When it comes to choosing a camera, photographers often find themselves torn between various options. In this article, we will compare the attributes of two popular cameras: the K R and the Pentax 645D. Both cameras have their own unique features and advantages, catering to different photography needs. By understanding their differences, photographers can make an informed decision based on their specific requirements.

Design and Build Quality

The K R boasts a compact and lightweight design, making it highly portable and suitable for on-the-go photography. Its ergonomic grip ensures a comfortable hold, allowing photographers to shoot for extended periods without fatigue. On the other hand, the Pentax 645D is a medium format camera that offers a more robust and sturdy build. Its larger size and weight may not be as convenient for travel, but it provides a professional feel and durability that is ideal for studio or landscape photography.

Image Quality

Both the K R and the Pentax 645D deliver exceptional image quality, but they differ in terms of sensor size. The K R features an APS-C sensor, which is smaller compared to the medium format sensor found in the Pentax 645D. The larger sensor of the 645D allows for greater dynamic range, improved low-light performance, and stunning detail reproduction. However, the K R's APS-C sensor still produces impressive images with excellent color accuracy and sharpness, making it a reliable choice for various photography genres.

Resolution and Megapixels

One of the significant advantages of the Pentax 645D is its high resolution. With a whopping 40 megapixels, it offers incredible detail and the ability to capture large prints without compromising image quality. On the other hand, the K R features a respectable 12.4-megapixel sensor, which is more than sufficient for most photography needs. While the 645D excels in resolution, the K R compensates with its affordability and versatility, making it a popular choice for beginners and enthusiasts.

Autofocus and Performance

When it comes to autofocus, the K R takes the lead with its advanced 11-point AF system. It offers fast and accurate focusing, ensuring that photographers can capture their subjects with precision. The Pentax 645D, although not as quick as the K R, still provides reliable autofocus performance with its 11-point SAFOX IX+ system. Both cameras offer continuous shooting modes, but the K R has a faster burst rate, making it more suitable for capturing fast-paced action or sports photography.

Video Capabilities

While both cameras excel in still photography, the K R surpasses the Pentax 645D in terms of video capabilities. The K R offers Full HD video recording at 1080p, allowing photographers to capture high-quality videos with ease. It also provides various manual controls and autofocus options for videography. On the other hand, the Pentax 645D lacks video recording capabilities altogether, focusing solely on delivering exceptional still images. Therefore, if video recording is a priority, the K R is the clear choice.

Weather Sealing and Durability

Both the K R and the Pentax 645D are known for their weather-sealed bodies, providing protection against dust, moisture, and extreme temperatures. This feature is particularly beneficial for outdoor photographers who often find themselves shooting in challenging conditions. The K R offers a high level of weather sealing, ensuring its durability even in harsh environments. Similarly, the Pentax 645D is built to withstand tough conditions, making it a reliable choice for professional photographers who frequently work in demanding outdoor settings.

Price and Value

When it comes to price, the K R is significantly more affordable compared to the Pentax 645D. The K R's affordability makes it an attractive option for beginners or photographers on a budget who still want to enjoy excellent image quality and versatile features. On the other hand, the Pentax 645D's higher price tag reflects its professional-grade capabilities and medium format sensor. It is a considerable investment for photographers who require the utmost image quality and resolution for their work.


Choosing between the K R and the Pentax 645D ultimately depends on individual preferences and photography needs. The K R offers a compact design, affordability, and excellent autofocus performance, making it suitable for a wide range of photography genres. On the other hand, the Pentax 645D excels in image quality, resolution, and durability, catering to professionals and enthusiasts who prioritize exceptional detail and robust build. By considering the attributes discussed in this article, photographers can make an informed decision and select the camera that best suits their specific requirements.

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