Fujifilm X10 vs Pentax 645Z

The Fujifilm X10 and the Pentax 645Z are two digital cameras that were announced, respectively, in September 2011 and April 2014. The X10 is a fixed lens compact, while the 645Z is a DSLR. The cameras are based on a 2/3 (X10) and a medium format (645Z) sensor. The Fujifilm has a resolution of 12 megapixels, whereas the Pentax provides 51.1 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications

Fujifilm X10		Pentax 645Z
Fixed lens compact camera		Digital single lens reflex
28-112mm f/2.0-2.8		Pentax 645 mount lenses
12 MP – Two Thirds sensor		51.1 MP – Medium Format sensor
1080/30p Video		1080/60i Video
ISO 100-3,200 (100 - 12,800)		ISO 100-204,800
Optical viewfinder		Optical viewfinder
2.8" LCD – 460k dots		3.2" LCD – 1037k dots
Fixed screen (not touch-sensitive)		Tilting screen (no touchscreen)
10 shutter flaps per second		3 shutter flaps per second
not weather sealed		Weathersealed body
270 shots per battery charge		650 shots per battery charge
117 x 70 x 57 mm, 350 g		156 x 117 x 123 mm, 1550 g

Check X10 offers at
ebay.com
Check 645Z offers at
ebay.com

Going beyond this snapshot of core features and characteristics, what are the differences between the Fujifilm X10 and the Pentax 645Z? 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.

Body comparison

The physical size and weight of the Fujifilm X10 and the Pentax 645Z are illustrated in the side-by-side display below. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All width, height and depth dimensions are rounded to the nearest millimeter.

The X10 can be obtained in two different colors (black, silver), while the 645Z is only available in black.

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax 645Z is considerably larger (123 percent) than the Fujifilm X10. It is noteworthy in this context that the 645Z is splash and dust-proof, while the X10 does not feature any corresponding weather-sealing.

The above size and weight comparisons are to some extent incomplete and possibly misleading, as the X10 has a lens built in, whereas the 645Z is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup.

Concerning battery life, the X10 gets 270 shots out of its Fujifilm NP-50 battery, while the 645Z can take 650 images on a single charge of its Pentax D-LI90 power pack.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. If you want to switch the focus of the display and review another camera pair, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.

Body Specifications

		Camera Model	Camera Width	Camera Height	Camera Depth	Camera Weight	Battery Life	Weather Sealing	Camera Launch	Launch Price	Street Price
1.		Fujifilm X10	117 mm	70 mm	57 mm	350 g	270	n	Sep 2011	US$ 599	ebay.com
2.		Pentax 645Z	156 mm	117 mm	123 mm	1550 g	650	Y	Apr 2014	US$ 8 499	ebay.com
3.		Canon 5DS	152 mm	116 mm	76 mm	930 g	700	Y	Feb 2015	US$ 3 699	ebay.com
4.		Canon 5DS R	152 mm	116 mm	76 mm	930 g	700	Y	Feb 2015	US$ 3 699	ebay.com
5.		Canon G12	112 mm	76 mm	48 mm	401 g	370	n	Sep 2010	US$ 499	ebay.com
6.		Canon G15	107 mm	76 mm	40 mm	352 g	350	n	Sep 2012	US$ 499	ebay.com
7.		Canon G16	109 mm	76 mm	40 mm	356 g	360	n	Aug 2013	US$ 549	ebay.com
8.		Fujifilm X20	117 mm	70 mm	57 mm	353 g	270	n	Jan 2013	US$ 599	ebay.com
9.		Fujifilm X30	119 mm	72 mm	60 mm	423 g	470	n	Aug 2014	US$ 599	ebay.com
10.		Hasselblad X1D	150 mm	98 mm	71 mm	725 g	..	Y	Jun 2016	US$ 8 995	ebay.com
11.		Leica D-LUX 6	111 mm	68 mm	46 mm	298 g	330	n	Sep 2012	US$ 699	ebay.com
12.		Leica SL	147 mm	104 mm	39 mm	847 g	400	Y	Oct 2015	US$ 7 449	ebay.com
13.		Panasonic G10	124 mm	84 mm	74 mm	388 g	380	n	Mar 2010	US$ 499	ebay.com
14.		Panasonic GF2	113 mm	68 mm	33 mm	310 g	300	n	Nov 2010	US$ 549	ebay.com
15.		Panasonic LX5	110 mm	65 mm	43 mm	271 g	400	n	Jul 2010	US$ 499	ebay.com
16.		Panasonic LX7	111 mm	68 mm	46 mm	298 g	330	n	Jul 2012	US$ 499	ebay.com
17.		Pentax 645D	156 mm	117 mm	119 mm	1480 g	800	Y	Mar 2010	US$ 9 995	ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
Convert to Imperial

Any camera decision will naturally be influenced heavily by the price. 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 X10 was launched at a lower price than the 645Z, despite having a lens built in. 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.

Sensor comparison

The imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Fujifilm X10 features a 2/3 sensor and the Pentax 645Z a medium format sensor. The sensor area in the 645Z is 2378 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 3.9 and 0.79. Both cameras feature a native aspect ratio (sensor width to sensor height) of 4:3.

With 51.1MP, the 645Z offers a higher resolution than the X10 (12MP), but the 645Z nevertheless has larger individual pixels (pixel pitch of 5.30μm versus 2.20μm for the X10) due to its larger sensor. Moreover, the 645Z is a much more recent model (by 2 years and 7 months) than the X10, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixel-units. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.

The resolution advantage of the Pentax 645Z implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the 645Z for good quality output (200 dots per inch) amounts to 41.3 x 31 inches or 104.9 x 78.6 cm, for very good quality (250 dpi) 33 x 24.8 inches or 83.9 x 62.9 cm, and for excellent quality (300 dpi) 27.5 x 20.6 inches or 69.9 x 52.4 cm. The corresponding values for the Fujifilm X10 are 20 x 15 inches or 50.8 x 38.1 cm for good quality, 16 x 12 inches or 40.6 x 30.5 cm for very good quality, and 13.3 x 10 inches or 33.9 x 25.4 cm for excellent quality prints.

The Fujifilm X10 has a native sensitivity range from ISO 100 to ISO 3200, which can be extended to ISO 100-12800. The corresponding ISO settings for the Pentax 645Z are ISO 100 to ISO 204800 (no boost).

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

For many cameras, data on sensor performance has been reported by DXO Mark. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). Of the two cameras under consideration, the 645Z offers substantially better image quality than the X10 (overall score 51 points higher). The advantage is based on 5.5 bits higher color depth, 3.4 EV in additional dynamic range, and 4.2 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.

Sensor Characteristics

		Camera Model	Sensor Class	Resolution (MP)	Horiz. Pixels	Vert. Pixels	Video Format	DXO Portrait	DXO Landscape	DXO Sports	DXO Overall
1.		Fujifilm X10	2/3	12.0	4000	3000	1080/30p	20.5	11.3	245	50
2.		Pentax 645Z	Medium Format	51.1	8256	6192	1080/60i	26.0	14.7	4505	101
3.		Canon 5DS	Full Frame	50.3	8688	5792	1080/30p	24.7	12.4	2381	87
4.		Canon 5DS R	Full Frame	50.3	8688	5792	1080/30p	24.6	12.4	2308	86
5.		Canon G12	1/1.7	10.0	3648	2736	720/24p	20.4	11.2	161	47
6.		Canon G15	1/1.7	12.0	4000	3000	1080/24p	19.9	11.5	165	46
7.		Canon G16	1/1.7	12.0	4000	3000	1080/60p	21.0	11.7	230	54
8.		Fujifilm X20	2/3	12.0	4000	3000	1080/60p	20.1	10.9	-462	46
9.		Fujifilm X30	2/3	12.0	4000	3000	1080/60p	20.4	11.2	-312	49
10.		Hasselblad X1D	Medium Format	51.3	8272	6200	1080/25p	26.2	14.8	4489	102
11.		Leica D-LUX 6	1/1.7	10.0	3648	2736	1080/60p	19.8	10.8	-303	43
12.		Leica SL	Full Frame	24.0	6000	4000	4K/30p	25.0	13.4	1821	88
13.		Panasonic G10	Four Thirds	12.0	4000	3000	720/30p	21.2	10.1	411	52
14.		Panasonic GF2	Four Thirds	12.0	4000	3000	1080/60i	21.2	10.3	506	54
15.		Panasonic LX5	1/1.7	10.0	3648	2736	720/60p	19.6	10.8	132	41
16.		Panasonic LX7	1/1.7	10.0	3648	2736	1080/60p	20.7	11.7	147	50
17.		Pentax 645D	Medium Format	39.5	7264	5440	none	24.6	12.6	1262	82
Note: DXO values in italics represent estimates based on sensor size and age.

Many modern cameras are not only capable of taking still images, but can also record movies. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the 645Z provides a faster frame rate than the X10. It can shoot movie footage at 1080/60i, while the Fujifilm is limited to 1080/30p.

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. The X10 and the 645Z 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 adjacent table lists some of the other core features of the Fujifilm X10 and Pentax 645Z along with similar information for a selection of comparators.

Core Features

		Camera Model	Viewfinder (Type or 000 dots)	Control Panel (yes/no)	LCD Specifications (inch/000 dots)	LCD Attach- ment	Touch Screen (yes/no)	Max Shutter Speed *	Max Shutter Flaps *	Built-in Flash (yes/no)	Built-in Image Stab
1.		Fujifilm X10	optical	n	2.8 / 460	fixed	n	1/4000s	10.0/s	Y	Y
2.		Pentax 645Z	optical	Y	3.2 / 1037	tilting	n	1/4000s	3.0/s	n	n
3.		Canon 5DS	optical	Y	3.2 / 1040	fixed	n	1/8000s	5.0/s	n	n
4.		Canon 5DS R	optical	Y	3.2 / 1040	fixed	n	1/8000s	5.0/s	n	n
5.		Canon G12	optical	n	2.8 / 461	swivel	n	1/4000s	1.1/s	Y	Y
6.		Canon G15	optical	n	3.0 / 922	fixed	n	1/4000s	2.1/s	Y	Y
7.		Canon G16	optical	n	3.0 / 922	fixed	n	1/4000s	2.2/s	Y	Y
8.		Fujifilm X20	optical	n	2.8 / 460	fixed	n	1/4000s	12.0/s	Y	Y
9.		Fujifilm X30	2360	n	3.0 / 920	tilting	n	1/4000s	12.0/s	Y	Y
10.		Hasselblad X1D	2360	n	3.0 / 920	fixed	Y	1/2000s	2.3/s	n	n
11.		Leica D-LUX 6	optional	n	3.0 / 920	fixed	n	1/4000s	11.0/s	Y	Y
12.		Leica SL	4400	Y	3.0 / 1040	fixed	Y	1/8000s	11.0/s	n	n
13.		Panasonic G10	202	n	3.0 / 460	fixed	n	1/4000s	2.6/s	Y	n
14.		Panasonic GF2	optional	n	3.0 / 460	fixed	Y	1/4000s	2.6/s	Y	n
15.		Panasonic LX5	optional	n	3.0 / 460	fixed	n	1/4000s	2.5/s	Y	Y
16.		Panasonic LX7	optional	n	3.0 / 920	fixed	n	1/4000s	11.0/s	Y	Y
17.		Pentax 645D	optical	Y	3.0 / 921	fixed	n	1/4000s	1.1/s	n	n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One difference between the cameras concerns the presence of an on-board flash. The X10 has one, while the 645Z does not. While the built-in flash of the X10 is not very powerful, it can at times be useful as a fill-in light.

The Pentax 645Z 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 X10 and the 645Z write their files to SDXC cards. The 645Z features dual card slots, which can be very useful in case a memory card fails. In contrast, the X10 only has one slot. The 645Z supports UHS-I cards (Ultra High Speed data transfer of up to 104 MB/s), while the X10 cannot take advantage of Ultra High Speed SD cards.

Connectivity comparison

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 Fujifilm X10 and Pentax 645Z and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

Input-Output Connections

		Camera Model	Hotshoe Port	Internal Mic / Speaker	Microphone Port	Headphone Port	HDMI Port	USB Port	WiFi Support	NFC Support	Bluetooth Support
1.		Fujifilm X10	Y	stereo / mono	-	-	mini	2.0	-	-	-
2.		Pentax 645Z	Y	stereo / mono	Y	-	mini	3.0	-	-	-
3.		Canon 5DS	Y	mono / mono	Y	-	mini	3.0	-	-	-
4.		Canon 5DS R	Y	mono / mono	Y	-	mini	3.0	-	-	-
5.		Canon G12	Y	stereo / mono	-	-	mini	2.0	-	-	-
6.		Canon G15	Y	stereo / mono	-	-	mini	2.0	-	-	-
7.		Canon G16	Y	stereo / mono	-	-	mini	2.0	Y	-	-
8.		Fujifilm X20	Y	stereo / mono	-	-	micro	2.0	-	-	-
9.		Fujifilm X30	Y	stereo / mono	-	-	micro	2.0	Y	-	-
10.		Hasselblad X1D	Y	stereo / mono	Y	Y	mini	3.0	Y	-	-
11.		Leica D-LUX 6	Y	stereo / mono	-	-	mini	2.0	-	-	-
12.		Leica SL	Y	stereo / mono	Y	Y	full	3.0	Y	-	-
13.		Panasonic G10	Y	mono / -	-	-	mini	2.0	-	-	-
14.		Panasonic GF2	Y	stereo / mono	-	-	mini	2.0	-	-	-
15.		Panasonic LX5	Y	mono / mono	-	-	mini	2.0	-	-	-
16.		Panasonic LX7	Y	stereo / mono	-	-	mini	2.0	-	-	-
17.		Pentax 645D	Y	stereo / -	-	-	-	2.0	-	-	-

It is notable that the 645Z has a microphone port, which can help to improve the quality of audio recordings by attaching an external microphone. The X10 does not feature such a mic input.

Studio photographers will appreciate that the Pentax 645Z (unlike the X10) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the X10 and the 645Z have been discontinued, but can regularly be found used on ebay. The X10 was replaced by the Fujifilm X20, while the 645Z does not have a direct successor. Further information on the features and operation of the X10 and 645Z can be found, respectively, in the Fujifilm X10 Manual (free pdf) or the online Pentax 645Z Manual.

Review summary

So what is the bottom line? Which of the two cameras – the Fujifilm X10 or the Pentax 645Z – has the upper hand? Is one clearly better than the other? The listing below highlights the relative strengths of the two models.

Arguments in favor of the Fujifilm X10:

• Faster burst: Shoots at higher frequency (10 vs 3 flaps/sec) to capture the decisive moment.
• Ready to shoot: Comes with a built-in lens, while the 645Z requires a separate lens.
• More compact: Is smaller (117x70mm vs 156x117mm) and thus needs less room in the bag.
• Less heavy: Is lighter even though it comes with a built-in lens (unlike the 645Z).
• Sharper images: Has hand-shake reducing image stabilization built-in.
• Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
• More affordable: Was introduced at a lower price, despite coming with a built-in lens.
• More heavily discounted: Has been available for much longer (launched in September 2011).

Advantages of the Pentax 645Z:

• More detail: Has more megapixels (51.1 vs 12MP), which boosts linear resolution by 106%.
• Better image quality: Scores substantially higher (51 points) in the DXO overall evaluation.
• Richer colors: Generates noticeably more natural colors (5.5 bits more color depth).
• More dynamic range: Captures a broader range of light and dark details (3.4 EV of extra DR).
• Better low-light sensitivity: Can shoot in dim conditions (4.2 stops ISO advantage).
• Better video: Provides higher movie framerates (1080/60i versus 1080/30p).
• Better sound: Can connect to an external microphone for higher quality sound recording.
• Easier setting verification: Features a control panel on top to check shooting parameters.
• Larger screen: Has a bigger rear LCD (3.2" vs 2.8") for image review and settings control.
• More detailed LCD: Has a higher resolution rear screen (1037k vs 460k dots).
• More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
• Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
• More flexible: Makes it possible to change lenses and thus to use specialty optics.
• Longer lasting: Gets more shots (650 versus 270) out of a single battery charge.
• Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
• Faster data transfer: Supports a more advanced USB protocol (3.0 vs 2.0).
• 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.
• Faster buffer clearing: Has an SD card interface that supports the UHS-I standard.
• More modern: Reflects 2 years and 7 months of technical progress since the X10 launch.

If the number of relative strengths (bullet points above) is taken as a guide, the 645Z is the clear winner of the contest (20 : 8 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding on a new camera. A professional wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports 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 Fujifilm X10 and the Pentax 645Z place the cameras among the top in their class? Find out in the latest Best Travel-Zoom Camera and Best DSLR Camera listings 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 incomplete and does no justice, for example, to the way the X10 or the 645Z perform in practice. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is where reviews by experts come in. The following table reports the overall ratings of the cameras as published by some of the major camera review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). 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.

Expert Camera Reviews

		Camera   Model	AP   score	CL   score	DCW   score	DPR   score	EPZ   score	PB   score	Camera Launch	Launch Price	Street Price
1.		Fujifilm X10	..	..	..	76/100	4/5	4.5/5	Sep 2011	US$ 599	ebay.com
2.		Pentax 645Z	5/5	..	3.5/5	..	4.5/5	5/5	Apr 2014	US$ 8 499	ebay.com
3.		Canon 5DS	..	+	..	83/100	4.5/5	4.5/5	Feb 2015	US$ 3 699	ebay.com
4.		Canon 5DS R	5/5	+	..	83/100	5/5	4.5/5	Feb 2015	US$ 3 699	ebay.com
5.		Canon G12	4/5	+	..	73/100	4.5/5	4.5/5	Sep 2010	US$ 499	ebay.com
6.		Canon G15	4/5	+	..	76/100	4.5/5	4.5/5	Sep 2012	US$ 499	ebay.com
7.		Canon G16	4/5	+	..	..	4.5/5	4.5/5	Aug 2013	US$ 549	ebay.com
8.		Fujifilm X20	4/5	+ +	..	77/100	4.5/5	5/5	Jan 2013	US$ 599	ebay.com
9.		Fujifilm X30	4/5	..	..	76/100	4.5/5	4.5/5	Aug 2014	US$ 599	ebay.com
10.		Hasselblad X1D	..	o	..	81/100	..	4/5	Jun 2016	US$ 8 995	ebay.com
11.		Leica D-LUX 6	..	..	..	..	4/5	4/5	Sep 2012	US$ 699	ebay.com
12.		Leica SL	4/5	..	4/5	84/100	4.5/5	4/5	Oct 2015	US$ 7 449	ebay.com
13.		Panasonic G10	3/5	..	..	70/100	4/5	4/5	Mar 2010	US$ 499	ebay.com
14.		Panasonic GF2	3/5	82/100	..	70/100	4.5/5	4.5/5	Nov 2010	US$ 549	ebay.com
15.		Panasonic LX5	4/5	+	..	73/100	4.5/5	4.5/5	Jul 2010	US$ 499	ebay.com
16.		Panasonic LX7	3/5	+ +	..	75/100	4/5	4.5/5	Jul 2012	US$ 499	ebay.com
17.		Pentax 645D	5/5	..	..	..	..	..	Mar 2010	US$ 9 995	ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The ratings are only valid when referring to cameras in the same category and of the same age. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparisons of ratings among very different cameras or across long time periods have little meaning. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

Check X10 offers at
ebay.com
Check 645Z offers at
ebay.com

Other camera comparisons

Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just make your choice using the following search menu. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.

~

Check X10 offers at
ebay.com
Check 645Z offers at
ebay.com

Did you notice an error on this page? If so, please get in touch, so that we can correct the information.