Camera Rocket Review Our evaluation of 645Z vs D810

Image Quality

RAW image quality independent of lens

DxOMark Low light, DxOMark Color depth and DxOMark Dynamic range


How fast and easily does the camera nail focus

focus points


How much delay is there between you and your photo?

continuous shooting


What do the experts think?

Reviews from and

No winner declared

Too close to call

Benchmarks Real world tests of Pentax 645Z vs Nikon D810

Low light image quality Highest ISO setting that still achieves great image quality

Pentax 645Z
1,216 ISO
Nikon D810
2,979 ISO

Shutter lag Delay to take a photo when prefocused

Pentax 645Z
112 ms
Nikon D810
54 ms

Continuous shooting Delay between fully pressing shutter to image capture

Pentax 645Z
3 fps
Nikon D810
5 fps

Battery life How many photos per battery charge (CIPA)

Pentax 645Z
650 photos
Nikon D810
1,200 photos

Color depth The number of variations of color the camera can capture

Pentax 645Z
23.7 bits
Nikon D810
25.7 bits

Dynamic range Maximum range a camera can capture in one image from light to dark

Pentax 645Z
13.4 ev
Nikon D810
14.8 ev

Features Key features of the Pentax 645Z  vs Nikon D810 

Megapixels Maximum resolution images are captured at

Pentax 645Z
51 MP
Nikon D810
36.2 MP

Focus points How many different points the camera can focus on

Screen size Larger screens make it easier to preview and review photos

Viewfinder size Large viewfinders are brighter and more comfortable to use

Pentax 645Z
Nikon D810

Pixel size How much area of the sensor is dedicated to each pixel

Pentax 645Z
28.5 microns
Nikon D810
23.8 microns

Specifications Full list of technical specs


Pentax 645Z  vs
Nikon D810 
Megapixels 51 MP 36.2 MP
Resolution 8248 x 6184 7360 x 4912
Area 44 x 33 mm 35.9 x 24 mm
Crop factor 0.8x 1.0x
Pixel size 28.5 microns 23.8 microns
Light sensitivity 100 ISO to 204,800 ISO 64 ISO to 12,800 ISO
Light sensitivity (Boost) None 32 ISO to 51,200 ISO
DCF 2.0
Self cleaning sensor Yes Yes

focus system

Type Phase detection Phase detection
Focus points 27 51
Cross type focus points 25 15
Supports continuous No Yes


Viewfinder mirror Opaque Opaque
Viewfinder Yes Yes
Type Pentaprism Pentaprism
Coverage 98% 100%
Magnification 0.62x 0.7x
Viewfinder size 0.76x 0.7x


Max continuous shooting 3 fps 5 fps
Battery life 650 1,200
Continuous shooting
5 fps
3 fps
Shutter lag 112 ms 54 ms


Pentax 645Z  vs
Nikon D810 
Video 1920 x 1080 @ 30 fps (MP4, MPEG-4) 1920 x 1080 @ 60 fps
Shoots video in 24p Yes Yes
Shoots high speed video No No
External mic jack 3.5mm 3.5mm
Autofocus while shooting video Contrast detection Contrast detection
Autofocus type Contrast detection Contrast detection
Autofocus supports continuous Yes Yes


Size 3.2" 3.2"
Resolution 1,037 k dots 1,229 k dots
Has a touch screen No No
Has a flip out screen No No
Supports live view Yes Yes


Min 30 s 30 s
Max 1/4000 s 1/8000 s

form factor

Size 156 x 117 x 123 mm 146 x 123 x 81.5 mm
Thickness 123 mm 81.5 mm
Weight 1,550 g 880 g
Is weather sealed Yes Yes


Includes a GPS No No
Supports HDR Yes Yes
WiFi None None
Automatic panorama No No
Create realistic 3D images No No
Image stabilization
Sensor shift
Pentax 645Z
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Nikon D810
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