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Fujifilm X100S vs Pentax 645Z

The Fujifilm X100S and the Pentax 645Z are two digital cameras that were officially introduced, respectively, in January 2013 and April 2014. The X100S is a fixed lens compact, while the 645Z is a DSLR. The cameras are based on an APS-C (X100S) and a medium format (645Z) sensor. The Fujifilm has a resolution of 16 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 X100S
versus
Pentax 645Z
Fujifilm X100S   Pentax 645Z
Fixed lens compact camera Digital single lens reflex
35mm f/2.0 Pentax 645 mount lenses
16 MP – APS-C sensor 51.1 MP – Medium Format sensor
1080/60p Video 1080/60i Video
ISO 200-6,400 (100 - 25,600) ISO 100-204,800
Electronic viewfinder (2360k dots) Optical viewfinder
2.8" LCD – 460k dots 3.2" LCD – 1037k dots
Fixed screen (not touch-sensitive) Tilting screen (no touchscreen)
6 shutter flaps per second 3 shutter flaps per second
not weather sealedWeathersealed body
330 shots per battery charge650 shots per battery charge
127 x 74 x 54 mm, 445 g 156 x 117 x 123 mm, 1550 g
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Check X100S offers at
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Check 645Z offers at
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Going beyond this snapshot of core features and characteristics, what are the differences between the Fujifilm X100S 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.

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Body comparison

The side-by-side display below illustrates the physical size and weight of the Fujifilm X100S and the Pentax 645Z. 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 X100S can be obtained in two different colors (black, silver), while the 645Z is only available in black.

Size Fujifilm X100S vs Pentax 645Z
Compare X100S versus 645Z top
Comparison X100S or 645Z rear

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 (94 percent) than the Fujifilm X100S. It is noteworthy in this context that the 645Z is splash and dust-proof, while the X100S does not feature any corresponding weather-sealing.

The above size and weight comparisons are to some extent incomplete and possibly misleading, as the X100S 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 X100S gets 330 shots out of its Fujifilm NP-95 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.

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Body Specifications
# image Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Fujifilm X100S 127 mm 74 mm 54 mm 445 g 330 n Jan 2013 1,299ebay.com
2.
 
Pentax 645Z 156 mm 117 mm 123 mm 1550 g 650 Y Apr 2014 8,499ebay.com
3.
 
Canon 5DS 152 mm 116 mm 76 mm 930 g 700 Y Feb 2015 3,699ebay.com
4.
 
Canon 5DS R 152 mm 116 mm 76 mm 930 g 700 Y Feb 2015 3,699ebay.com
5.
 
Canon G1 X 117 mm 81 mm 65 mm 534 g 250 n Jan 2012 799ebay.com
6.
 
Fujifilm X100F 127 mm 75 mm 52 mm 469 g 390 n Jan 2017 1,299ebay.com
7.
 
Fujifilm X-T10 118 mm 83 mm 41 mm 381 g 350 n May 2015 799ebay.com
8.
 
Fujifilm X30 119 mm 72 mm 60 mm 423 g 470 n Aug 2014 599ebay.com
9.
 
Fujifilm X100T 127 mm 74 mm 52 mm 440 g 330 n Sep 2014 1,299ebay.com
10.
 
Fujifilm X-T1 129 mm 90 mm 47 mm 440 g 350 Y Jan 2014 1,299ebay.com
11.
 
Fujifilm X-Pro1 140 mm 82 mm 43 mm 450 g 300 n Jan 2012 1,699ebay.com
12.
 
Fujifilm X100 126 mm 75 mm 54 mm 445 g 300 n Sep 2010 1,199ebay.com
13.
 
Hasselblad X1D 150 mm 98 mm 71 mm 725 g .. Y Jun 2016 8,995ebay.com
14.
 
Leica SL 147 mm 104 mm 39 mm 847 g 400 Y Oct 2015 7,450ebay.com
15.
 
Leica X Typ 113 133 mm 73 mm 78 mm 486 g 350 n Sep 2014 2,295ebay.com
16.
 
Nikon Coolpix A 111 mm 64 mm 40 mm 299 g 230 n Mar 2013 1,099ebay.com
17.
 
Pentax 645D 156 mm 117 mm 119 mm 1480 g 800 Y Mar 2010 9,995ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
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Any camera decision will obviously take relative prices into account. The retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. The X100S 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 size of the sensor inside a digital camera is one of the key determinants 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. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors tend to be more expensive and lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Fujifilm X100S features an APS-C sensor and the Pentax 645Z a medium format sensor. The sensor area in the 645Z is 290 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.5 and 0.79. The sensor in the X100S has a native 3:2 aspect ratio, while the one in the 645Z offers a 4:3 aspect.

Fujifilm X100S and Pentax 645Z sensor measures

With 51.1MP, the 645Z offers a higher resolution than the X100S (16MP), but the 645Z nevertheless has larger individual pixels (pixel pitch of 5.30μm versus 4.80μm for the X100S) due to its larger sensor. Moreover, the 645Z is a somewhat more recent model (by 1 year and 3 months) than the X100S, and its sensor might 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 X100S are 24.5 x 16.3 inches or 62.2 x 41.5 cm for good quality, 19.6 x 13.1 inches or 49.7 x 33.2 cm for very good quality, and 16.3 x 10.9 inches or 41.5 x 27.6 cm for excellent quality prints.

The X100S has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Fujifilm X100S has a native sensitivity range from ISO 200 to ISO 6400, which can be extended to ISO 100-25600. 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. The X100S uses Fujifilm's X-Trans layout of photosites, while the 645Z employs the more common Bayer array.

X100S versus 645Z MP

For many cameras, data on sensor performance has been reported by DXO Mark. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

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Sensor Characteristics
# image Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Fujifilm X100S APS-C 16.0 4896 32641080/60p23.312.5132975
2.
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505101
3.
 
Canon 5DS Full Frame 50.3 8688 57921080/30p24.712.4238187
4.
 
Canon 5DS R Full Frame 50.3 8688 57921080/30p24.612.4230886
5.
 
Canon G1 X 1.5-inch 14.2 4352 32641080/24p21.710.864460
6.
 
Fujifilm X100F APS-C 24.0 6000 40001080/60p23.913.2170481
7.
 
Fujifilm X-T10 APS-C 16.0 4896 32641080/60p23.712.9154679
8.
 
Fujifilm X30 2/3 12.0 4000 30001080/60p20.411.2-31249
9.
 
Fujifilm X100T APS-C 16.0 4896 32641080/60p23.612.8148378
10.
 
Fujifilm X-T1 APS-C 16.0 4896 32641080/60p23.512.7142677
11.
 
Fujifilm X-Pro1 APS-C 16.0 4896 32641080/24p23.112.3123874
12.
 
Fujifilm X100 APS-C 12.2 4288 2848720/30p22.912.4100173
13.
 
Hasselblad X1D Medium Format 51.3 8272 62001080/25p26.214.84489102
14.
 
Leica SL Full Frame 24.0 6000 40004K/30p25.013.4182188
15.
 
Leica X Typ 113 APS-C 16.1 4928 32641080/30p23.612.8149178
16.
 
Nikon Coolpix A APS-C 16.1 4928 32641080/30p23.413.8116480
17.
 
Pentax 645D Medium Format 39.5 7264 5440none24.612.6126282
Note: DXO values in italics represent estimates based on sensor size and age.
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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 X100S provides a higher frame rate than the 645Z. It can shoot video footage at 1080/60p, while the Pentax is limited to 1080/60i.

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Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the X100S has an electronic viewfinder (2360k dots), while the 645Z has an optical one. Both systems have their advantages, with the electronic viewfinder making it possible to project supplementary shooting information into the framing view, whereas the optical viewfinder offers lag-free viewing and a very clear framing image. The viewfinder in the X100S offers a wider field of view (100%) than the one in the 645Z (98%), so that a larger proportion of the captured image is visible in the finder. On the other hand, the viewfinder of the 645Z has a higher magnification (0.78x vs 0.43x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The adjacent table lists some of the other core features of the Fujifilm X100S and Pentax 645Z along with similar information for a selection of comparators.

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Core Features
# image 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 X100S2360 n2.8 / 460 fixed n 1/4000s 6.0/s Y n
2.
 
Pentax 645Zoptical Y3.2 / 1037 tilting n 1/4000s 3.0/s n n
3.
 
Canon 5DSoptical Y3.2 / 1040 fixed n 1/8000s 5.0/s n n
4.
 
Canon 5DS Roptical Y3.2 / 1040 fixed n 1/8000s 5.0/s n n
5.
 
Canon G1 Xoptical n3.0 / 922 swivel n 1/4000s 1.9/s Y Y
6.
 
Fujifilm X100F2360 n3.0 / 1040 fixed n 1/4000s 8.0/s Y n
7.
 
Fujifilm X-T102360 n3.0 / 920 tilting n 1/4000s 8.0/s Y n
8.
 
Fujifilm X302360 n3.0 / 920 tilting n 1/4000s 12.0/s Y Y
9.
 
Fujifilm X100T2360 n3.0 / 1040 fixed n 1/4000s 6.0/s Y n
10.
 
Fujifilm X-T12360 n3.0 / 1040 tilting n 1/4000s 8.0/s n n
11.
 
Fujifilm X-Pro11440 n3.0 / 1230 fixed n 1/4000s 6.0/s n n
12.
 
Fujifilm X1001440 n2.8 / 460 fixed n 1/4000s 5.0/s Y n
13.
 
Hasselblad X1D2360 n3.0 / 920 fixed Y 1/2000s 2.3/s n n
14.
 
Leica SL4400 Y3.0 / 1040 fixed Y 1/8000s 11.0/s n n
15.
 
Leica X Typ 113optional n3.0 / 920 fixed n 1/2000s 5.0/s Y n
16.
 
Nikon Coolpix Aoptional n3.0 / 921 fixed n 1/2000s 4.0/s Y n
17.
 
Pentax 645Doptical Y3.0 / 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.
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One difference between the cameras concerns the presence of an on-board flash. The X100S has one, while the 645Z does not. While the built-in flash of the X100S 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 X100S 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 X100S only has one slot. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.

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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 X100S and Pentax 645Z and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
# image Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Fujifilm X100SYstereo / mono--micro2.0---
2.
 
Pentax 645ZYstereo / monoY-mini3.0---
3.
 
Canon 5DSYmono / monoY-mini3.0---
4.
 
Canon 5DS RYmono / monoY-mini3.0---
5.
 
Canon G1 XYstereo / mono--mini2.0---
6.
 
Fujifilm X100FYstereo / monoY-micro2.0Y--
7.
 
Fujifilm X-T10Ystereo / monoY-micro2.0Y--
8.
 
Fujifilm X30Ystereo / mono--micro2.0Y--
9.
 
Fujifilm X100TYstereo / monoY-micro2.0Y--
10.
 
Fujifilm X-T1Ystereo / monoY-mini2.0Y--
11.
 
Fujifilm X-Pro1Ystereo / mono--mini2.0---
12.
 
Fujifilm X100Ystereo / ---mini2.0---
13.
 
Hasselblad X1DYstereo / monoYYmini3.0Y--
14.
 
Leica SLYstereo / monoYYfull3.0Y--
15.
 
Leica X Typ 113Ystereo / mono--mini2.0---
16.
 
Nikon Coolpix AYstereo / mono---2.0---
17.
 
Pentax 645DYstereo / ----2.0---
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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 X100S does not feature such a mic input.

Studio photographers will appreciate that the Pentax 645Z (unlike the X100S) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the X100S and the 645Z have been discontinued, but can regularly be found used on ebay. The X100S was replaced by the Fujifilm X100T, while the 645Z does not have a direct successor. Further information on the features and operation of the X100S and 645Z can be found, respectively, in the Fujifilm X100S Manual (free pdf) or the online Pentax 645Z Manual.

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Review summary

So what conclusions can be drawn? Is there a clear favorite between the Fujifilm X100S and the Pentax 645Z? Which camera is better? The listing below highlights the relative strengths of the two models.

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Advantages of the Fujifilm X100S:

  • Better video: Provides higher movie framerates (1080/60p versus 1080/60i).
  • Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • More complete view: Has a viewfinder with a larger field of view (100% vs 98%).
  • Faster burst: Shoots at higher frequency (6 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 (127x74mm 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).
  • 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 on the market for longer (launched in January 2013).

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Arguments in favor of the Pentax 645Z:

  • More detail: Has more megapixels (51.1 vs 16MP), which boosts linear resolution by 75%.
  • Better image quality: Is equipped with a larger and more technologically advanced sensor.
  • Richer colors: The sensor size advantage translates into images with better, more accurate colors.
  • More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
  • Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
  • Better sound: Can connect to an external microphone for higher quality sound recording.
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.43x).
  • 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 330) 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.
  • More modern: Was introduced somewhat (1 year and 3 months) more recently.

If the number of relative strengths (bullet points above) is taken as a guide, the 645Z is the clear winner of the contest (20 : 11 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision 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.

X100S 11:20 645Z

How about other alternatives? Do the specifications of the Fujifilm X100S and the Pentax 645Z place the cameras among the top in their class? Find out in the latest Best Prime Lens Compact 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 partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the X100S or the 645Z. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate.

Expert reviews

This is where reviews by experts come in. The adjacent summary-table relays the overall verdicts of several of the most popular 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.

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Expert Camera Reviews
# image  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Fujifilm X100S5/5+ +..81/1004.5/55/5 Jan 2013 1,299ebay.com
2.
 
Pentax 645Z5/5..3.5/5..4.5/55/5 Apr 2014 8,499ebay.com
3.
 
Canon 5DS..+..83/1004.5/54.5/5 Feb 2015 3,699ebay.com
4.
 
Canon 5DS R5/5+..83/1005/54.5/5 Feb 2015 3,699ebay.com
5.
 
Canon G1 X5/5+..76/1004/54.5/5 Jan 2012 799ebay.com
6.
 
Fujifilm X100F5/5+3.9/583/1004.5/54.5/5 Jan 2017 1,299ebay.com
7.
 
Fujifilm X-T104.5/5+ +..80/1005/55/5 May 2015 799ebay.com
8.
 
Fujifilm X304/5....76/1004.5/54.5/5 Aug 2014 599ebay.com
9.
 
Fujifilm X100T5/5+..81/1004.5/55/5 Sep 2014 1,299ebay.com
10.
 
Fujifilm X-T15/5+ +..84/1005/55/5 Jan 2014 1,299ebay.com
11.
 
Fujifilm X-Pro15/5+ +..79/1004.5/54.5/5 Jan 2012 1,699ebay.com
12.
 
Fujifilm X1003/5....75/1004/55/5 Sep 2010 1,199ebay.com
13.
 
Hasselblad X1D..o..81/100..4/5 Jun 2016 8,995ebay.com
14.
 
Leica SL4/5..4/584/1004.5/54/5 Oct 2015 7,450ebay.com
15.
 
Leica X Typ 1133.5/5......3.5/54/5 Sep 2014 2,295ebay.com
16.
 
Nikon Coolpix A4/5+..75/1004/54/5 Mar 2013 1,099ebay.com
17.
 
Pentax 645D5/5.......... Mar 2010 9,995ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.
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Care should be taken when interpreting the review scores above, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

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Other camera comparisons

Did this review help to inform your camera decision process? In case you are interested in seeing how other cameras pair up, just make your choice using the following search menu. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.

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    Specifications: Fujifilm X100S vs Pentax 645Z

    Below is a side-by-side comparison of the specs of the two cameras to facilitate a quick review of their differences and common features.

    Camera Specifications
    Camera Model Fujifilm X100S Pentax 645Z
    Camera Type Fixed lens compact camera Digital single lens reflex
    Camera Lens 35mm f/2.0 Pentax 645 mount lenses
    Launch Date January 2013 April 2014
    Launch Price USD 1,299 USD 8,499
    Sensor Specs Fujifilm X100S Pentax 645Z
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor Medium Format Sensor
    Sensor Size 23.6 x 15.6 mm 43.8 x 32.8 mm
    Sensor Area 368.16 mm2 1436.64 mm2
    Sensor Diagonal 28.3 mm 54.7 mm
    Crop Factor 1.5x 0.79x
    Sensor Resolution 16 Megapixels 51.1 Megapixels
    Image Resolution 4896 x 3264 pixels 8256 x 6192 pixels
    Pixel Pitch 4.80 μm 5.30 μm
    Pixel Density 4.34 MP/cm2 3.56 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 1080/60p Video 1080/60i Video
    ISO Setting 200 - 6,400 ISO 100 - 204,800 ISO
    ISO Boost 100 - 25,600 ISO no Enhancement
    Image Processor EXR Processor II PRIME III
    DXO Sensor Quality (score) .. 101
    DXO Color Depth (bits) .. 26.0
    DXO Dynamic Range (EV) .. 14.7
    DXO Low Light (ISO) .. 4505
    Screen Specs Fujifilm X100S Pentax 645Z
    Viewfinder Type Electronic viewfinder Optical viewfinder
    Viewfinder Field of View 100% 98%
    Viewfinder Magnification 0.43x 0.78x
    Viewfinder Resolution 2360k dots
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 2.8inch 3.2inch
    LCD Resolution 460k dots 1037k dots
    LCD Attachment Fixed screen Tilting screen
    Shooting Specs Fujifilm X100S Pentax 645Z
    Focus System On-Sensor Phase-detect Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/4000s
    Continuous Shooting 6 shutter flaps/s 3 shutter flaps/s
    Time-Lapse Photographyno IntervalometerIntervalometer built-in
    Fill Flash Built-in Flash no On-Board Flash
    Storage Medium SDXC cards SDXC cards
    Single or Dual Card Slots Single card slot Dual card slots
    UHS card support UHS-I UHS-I
    Connectivity Specs Fujifilm X100S Pentax 645Z
    External Flash Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 2.0 USB 3.0
    HDMI Port micro HDMI mini HDMI
    Microphone Port no MIC socket External MIC port
    Wifi Support no Wifi no Wifi
    Body Specs Fujifilm X100S Pentax 645Z
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type Fujifilm NP-95 Pentax D-LI90
    Battery Life (CIPA)330 shots per charge650 shots per charge
    Body Dimensions 127 x 74 x 54 mm
    (5.0 x 2.9 x 2.1 in)
    156 x 117 x 123 mm
    (6.1 x 4.6 x 4.8 in)
    Camera Weight 445 g (15.7 oz) 1550 g (54.7 oz)
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