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Nikon P900 vs Pentax 645Z

The Nikon Coolpix P900 and the Pentax 645Z are two digital cameras that were revealed to the public, respectively, in March 2015 and April 2014. The P900 is a fixed lens compact, while the 645Z is a DSLR. The cameras are based on a 1/2.3-inch (P900) and a medium format (645Z) sensor. The Nikon has a resolution of 15.9 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
Nikon P900
versus
Pentax 645Z
Nikon P900   Pentax 645Z
Fixed lens compact camera Digital single lens reflex
24-2000mm f/2.8-6.5 Pentax 645 mount lenses
15.9 MP – 1/2.3" sensor 51.1 MP – Medium Format sensor
1080/60p Video 1080/60i Video
ISO 100-6,400 (100 - 12,800) ISO 100-204,800
Electronic viewfinder (921k dots) Optical viewfinder
3.0" LCD – 921k dots 3.2" LCD – 1037k dots
Swivel screen (not touch-sensitive) Tilting screen (no touchscreen)
7 shutter flaps per second 3 shutter flaps per second
not weather sealedWeathersealed body
360 shots per battery charge650 shots per battery charge
140 x 103 x 137 mm, 899 g 156 x 117 x 123 mm, 1550 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon Coolpix P900 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 physical size and weight of the Nikon P900 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.

Size Nikon P900 vs Pentax 645Z
Compare P900 versus 645Z top
Comparison P900 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 notably larger (27 percent) than the Nikon P900. It is noteworthy in this context that the 645Z is splash and dust-proof, while the P900 does not feature any corresponding weather-sealing.

The above size and weight comparisons are to some extent incomplete and possibly misleading, as the P900 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 P900 gets 360 shots out of its Nikon EN-EL23 battery, while the 645Z can take 650 images on a single charge of its Pentax D-LI90 power pack. The power pack in the P900 can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. If you would like to visualize and compare a different camera combination, you can navigate to the CAM-parator app and make your selection from a broad list of cameras 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.
 
Nikon P900 140 mm 103 mm 137 mm 899 g 360 n Mar 2015 599ebay.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 SX60 128 mm 93 mm 114 mm 650 g 340 n Sep 2014 549ebay.com
6.
 
Hasselblad X1D 150 mm 98 mm 71 mm 725 g .. Y Jun 2016 8,995ebay.com
7.
 
Kodak AZ901 139 mm 104 mm 119 mm 777 g 400 n Jan 2016 499 amazon.com
8.
 
Leica SL 147 mm 104 mm 39 mm 847 g 400 Y Oct 2015 7,450ebay.com
9.
 
Nikon P950 140 mm 110 mm 150 mm 1005 g 290 n Jan 2020 799 amazon.com
10.
 
Nikon P1000 146 mm 119 mm 181 mm 1415 g 250 n Jul 2018 999 amazon.com
11.
 
Nikon B700 125 mm 85 mm 107 mm 565 g 350 n Feb 2016 499ebay.com
12.
 
Nikon B500 114 mm 78 mm 95 mm 541 g 600 n Jan 2016 299ebay.com
13.
 
Nikon L840 113 mm 78 mm 96 mm 538 g 590 n Feb 2015 299ebay.com
14.
 
Panasonic FZ100 124 mm 82 mm 92 mm 540 g 410 n Jul 2010 499ebay.com
15.
 
Pentax 645D 156 mm 117 mm 119 mm 1480 g 800 Y Mar 2010 9,995ebay.com
16.
 
Ricoh GR II 117 mm 63 mm 35 mm 251 g 320 n Jun 2015 699ebay.com
17.
 
Sony HX400V 130 mm 93 mm 103 mm 660 g 300 n Feb 2014 499ebay.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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The price is, of course, an important factor in any camera decision. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The P900 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 generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have richer color-depth than smaller pixels 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 associated with larger, more expensive camera bodies and lenses.

Of the two cameras under consideration, the Nikon P900 features a 1/2.3-inch sensor and the Pentax 645Z a medium format sensor. The sensor area in the 645Z is 5032 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 5.6 and 0.79. Both cameras feature a native aspect ratio (sensor width to sensor height) of 4:3.

Nikon P900 and Pentax 645Z sensor measures

With 51.1MP, the 645Z offers a higher resolution than the P900 (15.9MP), but the 645Z nevertheless has larger individual pixels (pixel pitch of 5.30μm versus 1.33μm for the P900) due to its larger sensor. However, the P900 is a somewhat more recent model (by 10 months) than the 645Z, and its sensor might have benefitted from technological advances during this time that 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 Nikon P900 are 23 x 17.3 inches or 58.5 x 43.9 cm for good quality, 18.4 x 13.8 inches or 46.8 x 35.1 cm for very good quality, and 15.4 x 11.5 inches or 39 x 29.3 cm for excellent quality prints.

The Nikon Coolpix P900 has a native sensitivity range from ISO 100 to ISO 6400, which can be extended to ISO 100-12800. The corresponding ISO settings for the Pentax 645Z are ISO 100 to ISO 204800 (no boost).

In terms of underlying technology, the P900 is build around a BSI-CMOS sensor, while the 645Z uses a CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

P900 versus 645Z MP

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"). 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.
 
Nikon P900 1/2.3 15.9 4608 34561080/60p20.211.672747
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 SX60 1/2.3 14.2 4608 30721080/60p19.210.812739
6.
 
Hasselblad X1D Medium Format 51.3 8272 62001080/25p26.214.84489102
7.
 
Kodak AZ901 1/2.3 20.2 5184 38881080/30p20.311.780648
8.
 
Leica SL Full Frame 24.0 6000 40004K/30p25.013.4182188
9.
 
Nikon P950 1/2.3 15.9 4608 34564K/30p20.712.3118952
10.
 
Nikon P1000 1/2.3 15.9 4608 34564K/30p20.612.1104451
11.
 
Nikon B700 1/2.3 20.2 5184 38884K/30p20.411.881848
12.
 
Nikon B500 1/2.3 15.9 4608 34561080/60i20.311.781048
13.
 
Nikon L840 1/2.3 15.9 4608 34561080/60i20.211.672147
14.
 
Panasonic FZ100 1/2.3 14.0 4320 32401080/60i19.410.730639
15.
 
Pentax 645D Medium Format 39.5 7264 5440none24.612.6126282
16.
 
Ricoh GR II APS-C 16.1 4928 32641080/30p23.613.7107880
17.
 
Sony HX400V 1/2.3 20.2 5184 38881080/60p20.111.462945
Note: DXO values in italics represent estimates based on sensor size and age.
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Many modern cameras cannot only take still pictures, but also record videos. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the P900 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 P900 has an electronic viewfinder (921k 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 following table reports on some other key feature differences and similarities of the Nikon P900, the Pentax 645Z, and comparable cameras.

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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.
 
Nikon P900921 n3.0 / 921 swivel n 1/4000s 7.0/s Y Y
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 SX60922 n3.0 / 922 swivel n 1/2000s 6.4/s Y Y
6.
 
Hasselblad X1D2360 n3.0 / 920 fixed Y 1/2000s 2.3/s n n
7.
 
Kodak AZ901202 n3.0 / 920 swivel n 1/2000s 5.0/s Y Y
8.
 
Leica SL4400 Y3.0 / 1040 fixed Y 1/8000s 11.0/s n n
9.
 
Nikon P9502359 n3.2 / 921 swivel n 1/4000s 7.0/s Y Y
10.
 
Nikon P10002359 n3.2 / 921 swivel n 1/4000s 7.0/s Y Y
11.
 
Nikon B700921 n3.0 / 921 swivel n 1/4000s 5.0/s Y Y
12.
 
Nikon B500none n3.0 / 921 tilting n 1/4000s 7.4/s Y Y
13.
 
Nikon L840none n3.0 / 921 tilting n 1/4000s 7.4/s Y Y
14.
 
Panasonic FZ100202 n3.0 / 460 swivel n 1/2000s 11.0/s Y Y
15.
 
Pentax 645Doptical Y3.0 / 921 fixed n 1/4000s 1.1/s n n
16.
 
Ricoh GR IIoptional n3.0 / 1230 fixed n 1/4000s 4.0/s Y n
17.
 
Sony HX400V210 n3.0 / 921 tilting n 1/4000s 10.0/s Y Y
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 P900 has one, while the 645Z does not. While the built-in flash of the P900 is not very powerful, it can at times be useful as a fill-in light.

The P900 has an articulated LCD that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in snapping selfies. In contrast, the 645Z does not have a selfie-screen.

The Nikon P900 and the Pentax 645Z both have 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 P900 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 P900 only has one slot. The 645Z supports UHS-I cards (Ultra High Speed data transfer of up to 104 MB/s), while the P900 cannot take advantage of Ultra High Speed SD cards.

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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 Nikon Coolpix P900 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.
 
Nikon P900-stereo / mono--micro2.0YY-
2.
 
Pentax 645ZYstereo / monoY-mini3.0---
3.
 
Canon 5DSYmono / monoY-mini3.0---
4.
 
Canon 5DS RYmono / monoY-mini3.0---
5.
 
Canon SX60Ystereo / monoY-mini2.0YY-
6.
 
Hasselblad X1DYstereo / monoYYmini3.0Y--
7.
 
Kodak AZ901-stereo / mono--micro2.0Y--
8.
 
Leica SLYstereo / monoYYfull3.0Y--
9.
 
Nikon P950Ystereo / monoY-micro2.0Y-Y
10.
 
Nikon P1000Ystereo / monoY-micro2.0Y-Y
11.
 
Nikon B700-stereo / mono--micro2.0YYY
12.
 
Nikon B500-stereo / mono--micro2.0YYY
13.
 
Nikon L840-stereo / mono--micro2.0YY-
14.
 
Panasonic FZ100Ystereo / mono--mini2.0---
15.
 
Pentax 645DYstereo / ----2.0---
16.
 
Ricoh GR IIYstereo / mono--micro2.0YY-
17.
 
Sony HX400VYstereo / mono--micro2.0YY-
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It is notable that the P900 offers wifi support, while the 645Z does not. Wifi can be a very convenient means to transfer image data to an off-camera location.

Studio photographers will appreciate that the Pentax 645Z (unlike the P900) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Travel and landscape photographers will find it useful that the P900 has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.

Both the P900 and the 645Z have been discontinued, but can regularly be found used on ebay. The P900 was replaced by the Nikon P950, while the 645Z does not have a direct successor. Further information on the features and operation of the P900 and 645Z can be found, respectively, in the Nikon P900 Manual (free pdf) or the online Pentax 645Z Manual.

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Review summary

So what conclusions can be drawn? Which of the two cameras – the Nikon P900 or the Pentax 645Z – has the upper hand? Is one clearly better than the other? Below is a summary of the relative strengths of each of the two contestants.

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Arguments in favor of the Nikon Coolpix P900:

  • Better video: Provides higher movie framerates (1080/60p versus 1080/60i).
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • More flexible LCD: Has a swivel screen for odd-angle shots in portrait or landscape orientation.
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Faster burst: Shoots at higher frequency (7 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 (140x103mm 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 travel charging: Can be conveniently charged via its USB port.
  • 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.
  • Easier geotagging: Features an internal GPS sensor to log localization data.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
  • More affordable: Was introduced at a lower price, despite coming with a built-in lens.
  • More modern: Is somewhat more recent (announced 10 months after the 645Z).

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Reasons to prefer the Pentax 645Z:

  • More detail: Has more megapixels (51.1 vs 15.9MP), which boosts linear resolution by 79%.
  • Better image quality: Features bigger pixels on a larger sensor for higher quality imaging.
  • Richer colors: The pixel size advantage translates into images with better, more accurate colors.
  • More dynamic range: Larger pixels capture a wider spectrum of light and dark details.
  • Better low-light sensitivity: Larger pixels means good image quality even under poor lighting.
  • Better sound: Can connect to an external microphone for higher quality sound recording.
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Easier setting verification: Features a control panel on top to check shooting parameters.
  • Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
  • More detailed LCD: Has a higher resolution rear screen (1037k vs 921k dots).
  • More flexible: Makes it possible to change lenses and thus to use specialty optics.
  • Longer lasting: Gets more shots (650 versus 360) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • Better lighting: Features a hotshoe and can thus hold and trigger an external flash gun.
  • 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 heavily discounted: Has been on the market for longer (launched in April 2014).

If the count of relative strengths (bullet points above) is taken as a measure, the 645Z emerges as the winner of the match-up (19 : 16 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 wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

P900 16:19 645Z

How about other alternatives? Do the specifications of the Nikon P900 and the Pentax 645Z place the cameras among the top in their class? Find out in the latest Best Superzoom Camera and Best DSLR Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains incomplete and does no justice, for example, to the way the P900 or the 645Z perform in practice. 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 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.

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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.
 
Nikon P900......77/1004/54/5 Mar 2015 599ebay.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 SX603/5+ +..75/1004/54.5/5 Sep 2014 549ebay.com
6.
 
Hasselblad X1D..o..81/100..4/5 Jun 2016 8,995ebay.com
7.
 
Kodak AZ901........3.5/53/5 Jan 2016 499 amazon.com
8.
 
Leica SL4/5..4/584/1004.5/54/5 Oct 2015 7,450ebay.com
9.
 
Nikon P950....3/5..4/54/5 Jan 2020 799 amazon.com
10.
 
Nikon P1000..+3.5/573/1003.5/53.5/5 Jul 2018 999 amazon.com
11.
 
Nikon B700..+....4/54/5 Feb 2016 499ebay.com
12.
 
Nikon B500..+....4/53.5/5 Jan 2016 299ebay.com
13.
 
Nikon L840..+ +....3.5/54/5 Feb 2015 299ebay.com
14.
 
Panasonic FZ100..+....4.5/54.5/5 Jul 2010 499ebay.com
15.
 
Pentax 645D5/5.......... Mar 2010 9,995ebay.com
16.
 
Ricoh GR II........4.5/54.5/5 Jun 2015 699ebay.com
17.
 
Sony HX400V4/5+ +....4/54/5 Feb 2014 499ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.
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The above review scores should be interpreted with care, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. Hence, a score should always be seen in the context of the camera's market launch date and its price, 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 would like to check on the differences and similarities of other camera models, just use the search menu below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Nikon P900 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 Nikon P900 Pentax 645Z
    Camera Type Fixed lens compact camera Digital single lens reflex
    Camera Lens 24-2000mm f/2.8-6.5 Pentax 645 mount lenses
    Launch Date March 2015 April 2014
    Launch Price USD 599 USD 8,499
    Sensor Specs Nikon P900 Pentax 645Z
    Sensor Technology BSI-CMOS CMOS
    Sensor Format 1/2.3" Sensor Medium Format Sensor
    Sensor Size 6.17 x 4.55 mm 43.8 x 32.8 mm
    Sensor Area 28.0735 mm2 1436.64 mm2
    Sensor Diagonal 7.7 mm 54.7 mm
    Crop Factor 5.6x 0.79x
    Sensor Resolution 15.9 Megapixels 51.1 Megapixels
    Image Resolution 4608 x 3456 pixels 8256 x 6192 pixels
    Pixel Pitch 1.33 μm 5.30 μm
    Pixel Density 56.73 MP/cm2 3.56 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 1080/60p Video 1080/60i Video
    ISO Setting 100 - 6,400 ISO 100 - 204,800 ISO
    ISO Boost 100 - 12,800 ISO no Enhancement
    Image Processor EXPEED C2 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 Nikon P900 Pentax 645Z
    Viewfinder Type Electronic viewfinder Optical viewfinder
    Viewfinder Field of View 100% 98%
    Viewfinder Magnification 0.78x
    Viewfinder Resolution 921k dots
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.2inch
    LCD Resolution 921k dots 1037k dots
    LCD Attachment Swivel screen Tilting screen
    Shooting Specs Nikon P900 Pentax 645Z
    Focus System Contrast-detect AF Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/4000s
    Continuous Shooting 7 shutter flaps/s 3 shutter flaps/s
    Time-Lapse PhotographyIntervalometer built-inIntervalometer 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 no UHS-I
    Connectivity Specs Nikon P900 Pentax 645Z
    External Flash no 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 Wifi built-in no Wifi
    Near-Field Communication NFC built-in no NFC
    Geotagging GPS built-in no internal GPS
    Body Specs Nikon P900 Pentax 645Z
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type Nikon EN-EL23 Pentax D-LI90
    Battery Life (CIPA)360 shots per charge650 shots per charge
    In-Camera Charging USB charging no USB charging
    Body Dimensions 140 x 103 x 137 mm
    (5.5 x 4.1 x 5.4 in)
    156 x 117 x 123 mm
    (6.1 x 4.6 x 4.8 in)
    Camera Weight 899 g (31.7 oz) 1550 g (54.7 oz)
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