Fujifilm X-S10 vs Pentax 645D

In this comparison, we will evaluate the Fujifilm X-S10 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.

Fujifilm X-S10 was introduced in October 2020 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 Fujifilm X-S10 over Pentax 645D.

This section shows those features and specifications which are the reason to choose Pentax 645D over Fujifilm X-S10.

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

Fujifilm X-S10 and Pentax 645D have 3.0" screens with 1,040k dot and 921k dot resolutions respectively. Fujifilm X-S10 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 Fujifilm X-S10 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

Fujifilm X-S10 has a built-in 0.5" Electronic (OLED) viewfinder with 2,360k dot resolution and Pentax 645D has a built-in Optical (pentaprism) viewfinder. Fujifilm X-S10 has 100% coverage with 0.93x (0.62x 35mm equivalent) magnification and Pentax 645D has 98% coverage with 0.56x (0.71x 35mm equivalent) magnification.

Fujifilm X-S10 features a 26.1 megapixel APS-C BSI-CMOS sensor with dimensions of 23.5 x 15.6 mm and a total area of 366.6 mm². Its native ISO range is 160 - 12,800 and expands to 80 - 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.

Fujifilm X-S10 has BSI-CMOS sensor, short for Backside Illuminated Complementary Metal-Oxide-Semiconductor sensor. In traditional CMOS sensors, the wiring and circuitry are located on the front side of the sensor, which can block some of the incoming light. BSI technology flips this design by placing the photosensitive elements (pixels) on the backside of the sensor, allowing more light to reach the pixels. This significantly enhances light sensitivity and improves low-light performance. BSI-CMOS sensors are particularly effective in low-light conditions, as they can capture more light, resulting in brighter and less noisy images. This makes them well-suited for indoor and night photography. BSI-CMOS sensors deliver a higher SNR and reduced cross-talk.

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

Fujifilm X-S10 is equipped with X-Processor 4 processor and can take pictures up to 6240 x 4160 resolution. Pentax 645D is equipped with PRIME II processor and can take pictures up to 7264 x 5440 resolution.

Lens Mount

Fujifilm X-S10 has Fujifilm X lens mount and Pentax 645D has Pentax 645_AF2 lens mount. Due to APS-C sensor in Fujifilm X-S10 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. 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

There is no optical low-pass filter (OLPF), also known as an anti-aliasing filter, in front of the sensor on either of the cameras. 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 Fujifilm X-S10

Fujifilm X-S10 has a built-in 5-Axis Sensor Shift in-body image stabilization (IBIS) with 6 stops of compensation. 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.

Built-in Wi-Fi on Fujifilm X-S10

Fujifilm X-S10 has a built-in Wi-Fi (802.11b/g/n, 2.4 GHz) 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 Fujifilm X-S10

Fujifilm X-S10 has a built-in Bluetooth (version 4.2 LE) 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.

USB Inputs and HDMI Outputs

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

Battery

Fujifilm X-S10 comes with NP-W126 battery pack with battery life of 325 shots and Pentax 645D comes with D-LI90 battery pack with battery life of 800 shots.

External Storage Slots

Fujifilm X-S10 has a single SD/SDHC/SDXC (UHS-I) card slot. Pentax 645D has Dual SD/SDHC card slots.

Shutter

Fujifilm X-S10 has Electronic shutter and Mechanical Focal Plane shutter. Shutter speed can go up to 1/32000 sec with electronic shutter and up to 1/4000 sec with mechanical shutter on Fujifilm X-S10, and up to 1/4000 sec on Pentax 645D. Fujifilm X-S10 can shoot continuously up to 20.0 fps with electronic shutter and up to 8.0 fps with mechanical shutter. Pentax 645D can shoot continuously up to 1.1 fps.

Focusing

Fujifilm X-S10 has Intelligent Hybrid AF (TTL contrast AF / TTL phase detection AF) system with 425 focusing points and Pentax 645D has 11 focusing points..

Exposure

Exposure meterings of Pentax 645D ranges from +2 to +21 EV and you can set the exposure compensation within the ±5 EV range on Fujifilm X-S10 and ±5 EV range on Pentax 645D. You can also do exposure bracketing and manual exposure adjustment on Fujifilm X-S10 and exposure lock, exposure bracketing and manual exposure adjustment on Pentax 645D.

Flash

Fujifilm X-S10 has a built-in flash with maximum range of 7.00 m at ISO 200 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 1/180 sec on Fujifilm X-S10 and 1/125 sec on Pentax 645D.

Fujifilm X-S10 body has dimensions of 126 x 85 x 65 mm (4.96 x 3.35 x 2.56") and Pentax 645D body has dimensions of 156 x 117 x 119 mm (6.14 x 4.61 x 4.69"). Fujifilm X-S10 weighs 465 g (1.03 lb / 16.40 oz) and Pentax 645D weighs 1480 g (3.26 lb / 52.21 oz).

Fujifilm X-S10

Pentax 645D

126 mm

85 mm

156 mm

117 mm

85 mm

117 mm

65 mm

119 mm