Canon EOS 5DS R vs Pentax K20D

In this comparison, we will evaluate the Canon EOS 5DS R and the Pentax K20D, 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 5DS R was introduced in February 2015 and Pentax K20D was introduced in June 2008. 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 5DS R over Pentax K20D.

This section shows those features and specifications which are the reason to choose Pentax K20D over Canon EOS 5DS R.

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 5DS R has a 3.2" screen with 1,040k dot resolution and Pentax K20D has a 2.7" screen with 230k dot resolution. Both have Fixed screens.

Viewfinder

Cameras have built-in Optical (pentaprism) viewfinders. Canon EOS 5DS R has 100% coverage with 0.71x magnification and Pentax K20D has 95% coverage with 0.95x (0.63x 35mm equivalent) magnification.

Canon EOS 5DS R features a 50.6 megapixel Full Frame CMOS sensor with dimensions of 36 x 24 mm and a total area of 864 mm². Its native ISO range is 100 - 6,400 and expands to 100 - 12,800 in boosted mode. Pentax K20D features a 14.6 megapixel APS-C CMOS sensor with dimensions of 23.4 x 15.6 mm and a total area of 243.4 mm². Its native ISO range is 100 - 3,200 and expands to 100 - 6,400 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 5DS R is equipped with Dual DIGIC 6 processor and can take pictures up to 8688 x 5792 resolution. Pentax K20D can take pictures up to 4672 x 3104 resolution. It can also take pictures with lower resolution like 3872 x 2592, 3008 x 2000, 1824 x 1216 with 3:2 aspect ratios.

Lens Mount

Canon EOS 5DS R has Canon EF lens mount and Pentax K20D has Pentax K_AF2 lens mount. Due to Full Frame sensor in Canon EOS 5DS R its crop factor is equal to 1x, this means that a 35mm equivalent focal length of the mounted lens will be equal to its actual focal length. Due to APS-C sensor in Pentax K20D its crop factor is equal to 1.5x, this means that a 35mm equivalent focal length of the mounted lens will be equal to its actual focal length times 1.5.

No Low-Pass Filter on Canon EOS 5DS R

There is no optical low-pass filter (OLPF), also known as an anti-aliasing filter, in front of the sensor on Canon EOS 5DS R. 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.

In-Body Image Stabilization on Pentax K20D

Pentax K20D has a built-in Sensor Shift in-body image stabilization (IBIS). This means that you are still getting vibration reduction when camera is paired with non-image stabilizied lenses. It also works with lenses with optical image stabilization and in combination can achieve even better compensation.

USB Inputs and HDMI Outputs

Both models have USB inputs for data transfer. connector for video signal output.

Battery

Canon EOS 5DS R comes with LP-E6 battery pack with battery life of 700 shots and Pentax K20D comes with D-LI50 battery pack.

External Storage Slots

Canon EOS 5DS R has two card slots - one for SD/SDHC/SDXC (UHS-I) and one for CompactFlash (UDMA 7). Pentax K20D has a single SD/SDHC card slot.

Shutter

Canon EOS 5DS R has Electronic shutter and Mechanical Focal Plane shutter. Pentax K20D has Electronically controlled Vertical Run Focal Plane shutter. Shutter speed can go up to 1/8000 sec on Canon EOS 5DS R, and up to 1/4000 sec on Pentax K20D. Canon EOS 5DS R can shoot continuously up to 5.0 fps. Pentax K20D can shoot continuously up to 3.0 fps.

Focusing

Canon EOS 5DS R has Dual Pixel CMOS AF system with 61 (41 cross-type) focusing points and Pentax K20D has 11 focusing points. Canon EOS 5DS R has detection range from -2 to +18 EV.

Exposure

Exposure meterings of Canon EOS 5DS R ranges from 0 to +20 EV and you can set the exposure compensation within the ±5 EV range on Canon EOS 5DS R and ±3 EV range on Pentax K20D. You can also do exposure bracketing and manual exposure adjustment on Canon EOS 5DS R and exposure lock, exposure bracketing and manual exposure adjustment on Pentax K20D.

Flash

Pentax K20D has a built-in flash with maximum range of 13.00 m at ISO 100 and also accepts external flash which can be connected via Hot Shoe or PC Terminal. Canon EOS 5DS R has no built-in flash but an external flash may be connected via Hot Shoe or PC Terminal. The fastest flash synchronization speed is 1/200 sec on Canon EOS 5DS R and 1/180 sec on Pentax K20D.

Canon EOS 5DS R body has dimensions of 152 x 116 x 76 mm (5.98 x 4.57 x 2.99") and Pentax K20D body has dimensions of 142 x 101 x 70 mm (5.59 x 3.98 x 2.76"). Canon EOS 5DS R weighs 930 g (2.05 lb / 32.80 oz) and Pentax K20D weighs 800 g (1.76 lb / 28.22 oz).

Canon EOS 5DS R

Pentax K20D

152 mm

116 mm

142 mm

101 mm

116 mm

101 mm

76 mm

70 mm