Pentax 645Z vs Nikon D810

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Main
Model
Price
Advantages

launch
Announced
Body type
Camera subcategory
Sensor
Effective pixels
Max resolution
Sensor size
Sensor type
Processor
Image ratio w:h
Other resolutions
Sensor photo detectors
Image
ISO
White balance presets
Custom white balance
Image stabilization
Uncompressed format
JPEG quality levels
Boosted ISO (minimum)
Boosted ISO (maximum)
Photography features
Minimum shutter speed
Maximum shutter speed
Aperture priority
Shutter priority
Manual exposure mode
Subject / scene modes
Built-in flash
External flash
Flash modes
Continuous drive
Self-timer
Metering modes
Exposure compensation
AE Bracketing
Flash range
WB Bracketing
Screen / viewfinder
Articulated LCD
Screen size
Screen dots
Touch screen
Screen type
Live view
Viewfinder type
Viewfinder coverage
Viewfinder magnification
Videography features
Resolutions
File Format
Microphone
Speaker
Videography notes
Optics & Focus
Autofocus
Manual focus
Number of focus points
Lens mount
Focal length multiplier
Physical
Weight (inc. batteries)
Dimensions
Environmentally sealed
Battery
Battery details
Battery Life (CIPA)
Storage
Storage types
Connectivity
USB
HDMI
Microphone port
Headphone port
Remote control
Wireless
Wireless notes
Other features
Orientation sensor
Timelapse recording
GPS
GPS notes
Samples
Videos

Main
Model
Pentax 645Z
Price
Advantages
SENSOR Effective pixels: 51 megapixels
SENSOR Max resolution: 8256 x 6192
SENSOR Sensor size: Medium format (44 x 33 mm)
SENSOR Sensor photo detectors: 53 megapixels
IMAGE ISO: AUto, ISO 100-204800
SCREEN / VIEWFINDER Articulated LCD: Tilting
VIDEOGRAPHY FEATURES Speaker: Stereo
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8.66/10

Main
Model
Nikon D810
Price
Advantages
PHOTOGRAPHY FEATURES Maximum shutter speed: 1/8000 sec
PHOTOGRAPHY FEATURES Built-in flash: Yes
PHOTOGRAPHY FEATURES Continuous drive: 5.0 fps
SCREEN / VIEWFINDER Screen dots: 1,229,000
VIDEOGRAPHY FEATURES Microphone: Stereo
OPTICS & FOCUS Number of focus points: 51
PHYSICAL Weight (inc. batteries): 980 g (2.16 lb / 34.57 oz)
PHYSICAL Battery Life (CIPA): 1200
Go to the Summary

launch
Announced
Apr 15, 2014
Body type
Camera subcategory
Large SLR
Sensor
Effective pixels
51 megapixels
Max resolution
8256 x 6192
Sensor size
Medium format (44 x 33 mm)
Sensor type
CMOS
Processor
PRIME III
Image ratio w:h
4:3
Other resolutions
6912 x 5184, 5376 x4032, 1920 x 1080
Sensor photo detectors
53 megapixels
Image
ISO
AUto, ISO 100-204800
White balance presets
10
Custom white balance
Yes (3 slots)
Image stabilization
No
Uncompressed format
RAW + TIFF
JPEG quality levels
Superfine, fine, normal
Boosted ISO (minimum)
—
Boosted ISO (maximum)
—
Photography features
Minimum shutter speed
30 sec
Maximum shutter speed
1/4000 sec
Aperture priority
Yes
Shutter priority
Yes
Manual exposure mode
Yes
Subject / scene modes
No
Built-in flash
No
External flash
Yes
Flash modes
Flash On, Flash On+Red-eye Reduction, Slow-speed Sync, Slow-speed Sync+Red-eye, P-TTL, Trailing Curtain Sync, contrast-control-sync, high-speed sync, wireless sync
Continuous drive
3.0 fps
Self-timer
Yes (2 or 10 secs)
Metering modes
- Multi
- Center-weighted
- Spot
Exposure compensation
±5 (at 1/3 EV, 1/2 EV steps)
AE Bracketing
±5 (2, 3, 5 frames at 1/3 EV, 1/2 EV, 1 EV, 2 EV steps)
Flash range
—
WB Bracketing
—
Screen / viewfinder
Articulated LCD
Tilting
Screen size
3.2″
Screen dots
1,037,000
Touch screen
No
Screen type
TFT LCD
Live view
Yes
Viewfinder type
Optical (pentaprism)
Viewfinder coverage
98%
Viewfinder magnification
0.62×
Videography features
Resolutions
1920 x 1080 (60i, 50i, 30p, 25p, 24p), 1280 x 720 (60p, 50p, 30p, 25p,24p)
File Format
MPEG-4, H.264
Microphone
Mono
Speaker
Stereo
Videography notes
—
Optics & Focus
Autofocus
- Contrast Detect (sensor)
- Phase Detect
- Multi-area
- Selective single-point
- Tracking
- Single
- Continuous
- Face Detection
- Live View
Manual focus
Yes
Number of focus points
27
Lens mount
Pentax 645AF2
Focal length multiplier
0.8×
Physical
Weight (inc. batteries)
1550 g (3.42 lb / 54.67 oz)
Dimensions
156 x 117 x 123 mm (6.14 x 4.61 x 4.84″)
Environmentally sealed
Yes (Weather and dust sealed, freezeproof to -010C/+14F)
Battery
Battery Pack
Battery details
D-LI90 lithium-ion battery and charger
Battery Life (CIPA)
650
Storage
Storage types
Dual SD/SDHC/SDXC slots
Connectivity
USB
USB 3.0 (5 GBit/sec)
HDMI
Yes (mini-HDMI)
Microphone port
Yes
Headphone port
No
Remote control
Yes
Wireless
—
Wireless notes
—
Other features
Orientation sensor
Yes
Timelapse recording
Yes
GPS
Optional
GPS notes
via O-GPS1
————
Watch video reviews

launch
Announced
Jun 26, 2014
Body type
Camera subcategory
Mid-size SLR
Sensor
Effective pixels
36 megapixels
Max resolution
7360 x 4912
Sensor size
Full frame (35.9 x 24 mm)
Sensor type
CMOS
Processor
EXPEED 4
Image ratio w:h
5:4, 3:2
Other resolutions
FX: 5520 x 3680, 3680 x 2456; 1.2: 6144 x 4080, 4608 x 3056, 3072 x 2040; 5:4: 6144 x 4912, 4608 x 3680, 3072 x 2456; DX: 4800 x 3200, 3600 x 2400, 2400 x 1600
Sensor photo detectors
37 megapixels
Image
ISO
Auto, 64-12800
White balance presets
12
Custom white balance
Yes (6 slots)
Image stabilization
No
Uncompressed format
RAW + TIFF
JPEG quality levels
Fine, normal, basic
Boosted ISO (minimum)
32
Boosted ISO (maximum)
51200
Photography features
Minimum shutter speed
30 sec
Maximum shutter speed
1/8000 sec
Aperture priority
Yes
Shutter priority
Yes
Manual exposure mode
Yes
Subject / scene modes
No
Built-in flash
Yes
External flash
Yes (via hot shoe, flash sync terminal, wireless)
Flash modes
Front-curtain sync, slow sync, rear-curtain sync, redeye reduction, redeye reduction w/slow sync, slow rear-curtain sync
Continuous drive
5.0 fps
Self-timer
Yes (2, 5, 10, 20 secs for up to 9 shots)
Metering modes
- Multi
- Center-weighted
- Highlight-weighted
- Spot
Exposure compensation
±5 (at 1/3 EV, 1/2 EV, 1 EV steps)
AE Bracketing
±5 (2, 3, 5, 7 frames at 1/3 EV, 2/3 EV, 1 EV steps)
Flash range
12.00 m (at ISO 100)
WB Bracketing
Yes (2-9 exposures in 1-3 increments)
Screen / viewfinder
Articulated LCD
Fixed
Screen size
3.2″
Screen dots
1,229,000
Touch screen
No
Screen type
TFT-LCD (WRGB)
Live view
Yes
Viewfinder type
Optical (tunnel)
Viewfinder coverage
100%
Viewfinder magnification
0.7×
Videography features
Resolutions
1920 x 1080 (60p, 50p, 30p, 25p, 24p), 1280 x 720 (60p, 50p)
File Format
MPEG-4, H.264
Microphone
Stereo
Speaker
Mono
Videography notes
Uncompressed output over HDMI with simultaneous writing to memory card
Optics & Focus
Autofocus
- Contrast Detect (sensor)
- Phase Detect
- Multi-area
- Center
- Selective single-point
- Tracking
- Single
- Continuous
- Face Detection
- Live View
Manual focus
Yes
Number of focus points
51
Lens mount
Nikon F
Focal length multiplier
1×
Physical
Weight (inc. batteries)
980 g (2.16 lb / 34.57 oz)
Dimensions
146 x 123 x 82 mm (5.75 x 4.84 x 3.23″)
Environmentally sealed
Yes
Battery
Battery Pack
Battery details
EN-EL15 lithium-ion battery & charger
Battery Life (CIPA)
1200
Storage
Storage types
SD/SDHC/SDXC, CompactFlash (UDMA compliant)
Connectivity
USB
USB 3.0 (5 GBit/sec)
HDMI
Yes (mini-HDMI)
Microphone port
—
Headphone port
—
Remote control
Yes
Wireless
Optional
Wireless notes
via WT-5A or Eye-Fi
Other features
Orientation sensor
—
Timelapse recording
—
GPS
Optional
GPS notes
via GP-1 or GP-1A
Watch sample photos
Watch video reviews

Summary

The Nikon D810 highest resolution of 7360 x 4912 pixels (36 megapixels) is better in comparison with the 645Z maximum resolution of 8256 x 6192 pixels (51 megapixels).

The Nikon D810 display is better as it has more number of screen dots 1,229,000 in comparison to 1,037,000 dots of the 645Z screen. The higher dot count display is better for reviewing photos on your camera.

The Nikon D810 has built-in flash. The Nikon D810 weighs 980g which is 570g less in comparison with the weight of the 645Z.

As you can see the Nikon D810 is the best buy. Get the list of the best offers on Amazon.