Compare Pentax 645Z vs Nikon D850 vs Nikon D6
Connectivity
Ports
HDMI + Microphone + Remote Control + USB 3.0
HDMI + Headphone + Microphone + Remote Control + USB 3.0
HDMI + Headphone + Microphone + Remote Control + USB 3.2 Gen 1
Wireless Connectivity
802.11b/g + NFC + Bluetooth 4.1 LE
802.11ac + Bluetooth
Construction
Form Factor
DSLR camera
DSLR camera
Image Size
Medium format (645)
Full frame (35.9 x 23.9 mm)
Full frame (35.9 x 23.9 mm)
Lens Mount
PENTAX 645AF2
Nikon F-mount
Nikon F-mount
Microphone
Mono
Stereo
Stereo
Sensor | Resolution
51 MP (8256 x 6192)
45 MP (8256 x 5504)
21 MP (5568 x 3712)
Sensor | Type
CMOS
BSI-CMOS
CMOS
Speakers
Stereo
Mono
Mono
Dimensions
Size | Depth
123 mm / 4.84 in
79 mm / 3.11 in
92 mm / 3.62 in
Size | Height
117 mm / 4.61 in
124 mm / 4.88 in
163 mm / 6.42 in
Size | Width
156 mm / 6.14 in
146 mm / 5.75 in
160 mm / 6.30 in
Weight
1550 g / 54.77 oz
1005 g / 35.51 oz
1450 g / 51.24 oz
Display
Display Diagonal
3.2 inch
3.2 inch
3.2 inch
Display Type
Tilting TFT LCD
Tilting TFT LCD
Fixed TFT LCD
Resolution
1,037,000 dots
2,359,000 dots
2,359,000 dots
Viewfinder | Coverage
98%
100%
100%
Viewfinder | Magnification
0.62x
0.75x
0.72x
Viewfinder | Type
Optical (pentaprism)
Optical (pentaprism)
Optical (pentaprism)
Function
AE Bracketing
±5 (2, 3, 5 frames at 1/3 EV, 1/2 EV, 1 EV, 2 EV steps)
±5 (2, 3, 5, 7 frames at 1/3 EV, 1/2 EV, 2/3 EV, 1 EV steps)
Autofocus
27 focus points
151 focus points
105 focus points (105 cross type)
Crop Factor
0.6
1.0
1.0
Exposure Compensation
±5 (at 1/3 EV, 1/2 EV steps)
±5 (at 1/3 EV, 1/2 EV, 1 EV steps)
±5 (at 1/3 EV, 1/2 EV, 1 EV steps)
Exposure Mode
Auto / Aperture Priority / Shutter Priority / Manual
Auto / Aperture Priority / Shutter Priority / Manual
Auto / Aperture Priority / Shutter Priority / Manual
Flash Sync Speed
1/250 s
GPS
Optional via O-GPS1
No
Yes
ISO Range
to, ISO 100 ~ 204800
64 ~ 25600 (expands to 32 ~ 102400)
100 ~ 102400 (expands to 50 ~ 3280000)
Image Stabilization
No
No
No
Intervalometer
Yes
Yes
Yes
Processor
PRIME III
Expeed 5
Expeed 6
Touch Screen
No
Yes
Yes
Video Codecs
MPEG-4, H.264
MPEG-4
MPEG-4, H.264
Video Recording
4K 30p, FHD 60p
Weather Resistance
Yes
Yes
Yes
Performance
Battery Life
650 shots
1840 shots
3580 shots
Max Burst Rate
3.0 fps
7.0 fps
14.0 fps
Shutter Speed
1/8000 - 30 s
Storage
Dual SD/SDHC/SDXC slots
SD/SDHC/SDXC (UHS-II supported) + XQD
Dual XQD/CFexpress slots
Production
Battery
D-LI90 lithium-ion battery and charger
EN-EL15a lithium-ion battery & charger
EN-EL18c lithium-ion battery & charager
Debut
2014-04-15
2017-07-25
2019-09-04
Made In
Japan
Reviews
Neofiliac score
62%
73%
73%
Pros
- Long battery life
- Medium format look
- Exceptionally high 51 MP resolution
- Weather-sealed
- Affordable for a 645 DSLR
- Exceptional battery life
- 64 base ISO
- High 45 MP resolution
- Weather-sealed
- Supports both WiFi and Bluetooth
- Exceptional ergonomics
- Exceptional battery life
- Built-in GPS functionality
- Good 14.0 fps burst rate
- Weather-sealed
- Supports CFExpress card
- Supports both WiFi and Bluetooth
Cons
- Menu not touch-enabled
- Very low 3.0 fps burst rate
- Very large in size
- Very heavy
- Viewfinder coverage is cropped at 98%
- Viewfinder with low 0.62x magnification
- Low 7.0 fps burst rate
- Very heavy
- Viewfinder with low 0.75x magnification
- Very large in size
- Very heavy
- Viewfinder with low 0.72x magnification
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