Pentax 645Z vs Sony Alpha A77

(46)
(233)
Pentax 645Z
Sony Alpha A77

Top Prices

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Reasons For

10 Reasons For
Vastly higher megapixel Edit
The Pentax 645Z has a megapixel of 51.4MP, however the Sony Alpha A77 is only a 24.3MP digital camera (27.1MP lower). Read more

The resolution of the images a digital camera produces is measured in megapixels (MP). One megapixel is equal to 1 million pixels and is a result of the pixel width multiplied by the pixel height of the image. While a higher image resolution generally results in sharper images, only a relatively low megapixel count is required when printing the image at a small size or to display it on a computer screen.

A sensor with more megapixels will be able to capture more detailed photos and the image will appear sharper. Images with more megapixels can also be printed at a larger size.

Significantly more total megapixels Edit
The Pentax 645Z has a total megapixels of 52.99MP, whereas the Sony Alpha A77 is only a 24.7MP digital camera (28.29MP less).
26% smaller minimum aperture number Edit
Pentax 645Z is 2.8 minimum aperture. That's 0.7 smaller than the Sony Alpha A77 (3.5).
Nine number of diaphragm bladess Edit
The Pentax 645Z is a nine number of diaphragm blades digital camera, whereas the Sony Alpha A77 only has seven number of diaphragm bladess.
Hugely higher ISO sensitivity (max) Edit
Pentax 645Z is 204,800 maximum ISO speed, but the Sony Alpha A77 is only a 51,200 maximum ISO speed digital camera (153,600 lower).
0.2" larger display diagonal Edit
The Pentax 645Z has a display diagonal of 3.2", however the Sony Alpha A77 is only a 3" screen digital camera (0.2" smaller). Read more

The display diagonal is the size the size of the screen integrated in to the back of the camera. A larger display diagonal makes it easier to see if a shot has turned out as intended. Pocket cameras have smaller display diagonals as full size digital SLRs.

A larger display diagonal makes it easier to take photos and to see if a shot has turned out as intended.

2% smaller lens diameter Edit
The Pentax 645Z is a 68.2mm lens diameter digital camera. That's 1.3mm smaller than the Sony Alpha A77 (69.5mm).
One hundred and seventy more battery life (CIPA standard)s Edit
The Pentax 645Z is a digital camera that takes 650.00 battery life (CIPA standard)s, whereas the Sony Alpha A77 only takes 480.00 battery life (CIPA standard)s. Read more

The number of shots per battery charge is the number of photos that the camera will typically take on a single charge of the battery.

More shots per battery charge means you will have to recharge the battery less frequently and reduces the need to carry a second back up battery.

Expert reviews are slightly better
The Pentax 645Z has an average expert review score of 89% based on 30 reviews, but the Sony Alpha A77 has an average rating of 86% (based on 121 reviews).
User reviews are slightly better
The Pentax 645Z has an average user review score of 100% based on 16 reviews, but the Sony Alpha A77 has an average rating of 97% (based on 112 reviews).
10 Reasons For
39% smaller maximum aperture number Edit
The Sony Alpha A77 has a maximum aperture number of 36. That's 14 smaller than the Pentax 645Z (36).
50 smaller ISO sensitivity (min) Edit
The Sony Alpha A77 is a 50 minimum ISO speed digital camera. That's 50 smaller than the Pentax 645Z (50).
Wider field of view Edit
The Sony Alpha A77 is a 100% field of view digital camera. That's 2% wider than the Pentax 645Z (100%).
191,800 pixels higher display resolution (numeric) Edit
The Sony Alpha A77 is a 1,228,800 pixels display resolution digital camera. That's 191,800 pixels higher than the Pentax 645Z (1,228,800 pixels).
Two times lighter Edit
The Sony Alpha A77 has a weight of 647g, whereas the Pentax 645Z is a 1.5kg digital camera (823g heavier). Read more

The camera's weight will depend on the type and size of camera. Compact cameras are usually the lightest while digital SLRs will be heavier. Also consider the number and weight of lenses to take when using a SLR.

The lower the camera weight, the easier it will be to carry around and it will also reduce your hand luggage weight when flying.

Significantly lighter lens weight Edit
The Sony Alpha A77 has a lens weight of 210g, whereas the Pentax 645Z is a 416g lens weight digital camera (206g heavier).
18% shorter lens length Edit
The Sony Alpha A77 is a 69mm lens length digital camera. That's 12.3mm shorter than the Pentax 645Z (69mm).
Cheaper by £4,806
The Sony Alpha A77 costs £925.92, whereas the Pentax 645Z is £5,731.88.
1 shops are selling it
The more sellers stock the product, the greater competition amongst sellers to keep prices low.
Twenty-one more awards
The Sony Alpha A77 has 25 awards from expert review sites, however the Pentax 645Z has 4 awards.

Reasons Against

11 Reasons Against
Vastly bigger maximum aperture number Edit
The Pentax 645Z has a maximum aperture number of 22, however the Sony Alpha A77 is a 36 maximum aperture digital camera (14 smaller).
A lot bigger ISO sensitivity (min) Edit
The Pentax 645Z is a 100 minimum ISO speed digital camera, whereas the Sony Alpha A77 is a 50 minimum ISO speed digital camera (50 smaller).
2% narrower field of view Edit
The Pentax 645Z has a field of view of 98%, whereas the Sony Alpha A77 is a 100% field of view digital camera (2% wider).
191,800 pixels lower display resolution (numeric) Edit
The Pentax 645Z is a 1,037,000 pixels display resolution digital camera, whereas the Sony Alpha A77 is a 1,228,800 pixels display resolution digital camera (191,800 pixels higher).
Heavier Edit
The Pentax 645Z is a 1.5kg digital camera. That's 823g heavier than the Sony Alpha A77 (647g). Read more

The camera's weight will depend on the type and size of camera. Compact cameras are usually the lightest while digital SLRs will be heavier. Also consider the number and weight of lenses to take when using a SLR.

The lower the camera weight, the easier it will be to carry around and it will also reduce your hand luggage weight when flying.

Heavier lens weight Edit
The Pentax 645Z is a 416g lens weight digital camera. That's 206g heavier than the Sony Alpha A77 (210g).
16% longer lens length Edit
The Pentax 645Z has a lens length of 81.3mm, however the Sony Alpha A77 is a 69mm lens length digital camera (12.3mm shorter).
£4,806 more expensive
The Pentax 645Z is more expensive than the Sony Alpha A77 by £4,805.96.
Not as many stockists
Only 6 stores sells the Pentax 645Z, however 7 shops sell the Sony Alpha A77. Read more
Smaller numbers of stores reduces the chances of this digital camera remaining in stock and also reduces the price competition amongst retailers for the product.
Three months older
The Pentax 645Z is older than the Sony Alpha A77 by three months.
Fewer awards
Whilst the Pentax 645Z has received 4 awards, the Sony Alpha A77 has received 25 awards.
10 Reasons Against
27.1MP lower megapixel Edit
The Sony Alpha A77 is a 24.3MP digital camera. That's 27.1MP lower than the Pentax 645Z (24.3MP). Read more

The resolution of the images a digital camera produces is measured in megapixels (MP). One megapixel is equal to 1 million pixels and is a result of the pixel width multiplied by the pixel height of the image. While a higher image resolution generally results in sharper images, only a relatively low megapixel count is required when printing the image at a small size or to display it on a computer screen.

A sensor with more megapixels will be able to capture more detailed photos and the image will appear sharper. Images with more megapixels can also be printed at a larger size.

Two times less total megapixels Edit
The Sony Alpha A77 is a 24.7MP digital camera. That's 28.29MP less than the Pentax 645Z (24.7MP).
Larger minimum aperture number Edit
Sony Alpha A77 is 3.5 minimum aperture, but the Pentax 645Z is a 2.8 minimum aperture digital camera (0.7 smaller).
Two less number of diaphragm bladess Edit
The Sony Alpha A77 is a seven number of diaphragm blades digital camera, whereas the Pentax 645Z only has nine number of diaphragm bladess.
153,600 lower ISO sensitivity (max) Edit
Sony Alpha A77 is only 51,200 maximum ISO speed. That's 153,600 lower than the Pentax 645Z (51,200).
Smaller display diagonal Edit
The Sony Alpha A77 has a display diagonal of 3". That's 0.2" smaller than the Pentax 645Z (3"). Read more

The display diagonal is the size the size of the screen integrated in to the back of the camera. A larger display diagonal makes it easier to see if a shot has turned out as intended. Pocket cameras have smaller display diagonals as full size digital SLRs.

A larger display diagonal makes it easier to take photos and to see if a shot has turned out as intended.

1.3mm bigger lens diameter Edit
The Sony Alpha A77 has a lens diameter of 69.5mm, but the Pentax 645Z is a 68.2mm lens diameter digital camera (1.3mm smaller).
Only 480.00 battery life (CIPA standard)s Edit
The Sony Alpha A77 is a digital camera that takes 480.00 battery life (CIPA standard)s, whereas the Pentax 645Z only takes 650.00 battery life (CIPA standard)s. Read more

The number of shots per battery charge is the number of photos that the camera will typically take on a single charge of the battery.

More shots per battery charge means you will have to recharge the battery less frequently and reduces the need to carry a second back up battery.

Expert review Rating is marginally Worse
The Sony Alpha A77 has an average expert score of 86%, but the Pentax 645Z has an average expert rating of 89% (based on 30 reviews).
User review Rating is marginally Worse
The Sony Alpha A77 has an average user score of 97%, but the Pentax 645Z has an average user rating of 100% (based on 16 reviews).

Awards

4 Awards
Ephotozine: Highly Recommended
Imaging Resource.com: Dave's Pick
PC Mag: Editor's Choice
PhotographyBlog.com: Essential
25 Awards
01net.com: 5 Star
Akam.no: Recommended
buy-n-shoot.com: Platinum
camcorderinfo.com: Editor's Choice
Camera Labs: Highly Recommended
chip.com.my: Outstanding
Digital Versus: 5 Star
Digitaltrends.com: Editor's Choice
DP Review: Silver
Ephotozine: Highly Recommended
gagadget.com: Recommended
Les Numeriques.com: 5 Star
ljudochbild.se: Especially Recommended
log.com.tr: Editor's Choice
Lydogbilde.no: Especially Recommended 5 star
lydogbillede.dk: Especially Recommended 5 Star
M3.idg.se: Recommended
Magnus.de: Test Winner
PC Mag: Editor's Choice
PhotographyBlog.com: Essential
photoreview.com.au: Editor's Choice
Pocket Lint: Hot Product
reviewed.com: Editor's Choice
Trusted Reviews: Recommended
What Digital Camera: Gold

Average Expert Rating

Average User Rating

Date Released

28 months Ago 25 months Ago

Picture Quality

Camera Type
 SLR
 SLR
Megapixel
51.4MP
BEST
24.3MP
Image Stabilizer
 Image stabilizer
 Image stabilizer
Sensor Type
 CMOS
 CMOS
Still Image Resolution(s)
 6000 x 4000
 12416 x 1856
 6000 x 3376
 8192 x 1856
 4240 x 2832
 5536 x 2160
 4240 x 2400
 3872 x 2160
 3008 x 2000
 3008 x 1688
 6000 x 4000
 12416 x 1856
 6000 x 3376
 8192 x 1856
 4240 x 2832
 5536 x 2160
 4240 x 2400
 3872 x 2160
 3008 x 2000
 3008 x 1688
BEST
Maximum Image Resolution
 8256 x 6192
BEST
 8256 x 6192
Image Formats Supported
 RAW
 JPG
 TIF
 EXIF
 RAW
 JPG
 TIF
 EXIF
Image Sensor Size (W X H)
44 x 33 23.5 x 15.6
Total Megapixels
52.99MP
BEST
24.7MP
Image Stabilizer Location
 Body
 Body
Sensor Format
 Advanced Photo System type-C (APS-C)
 Advanced Photo System type-C (APS-C)
Supported Aspect Ratios
 16:9
 3:2
 16:9
 3:2
BEST

Design

Colour of Product
 Black
 Black

Lens System

Digital Zoom
Unknown - Click to provide data 4x
Maximum Aperture Number
22 36
BEST
Minimum Aperture Number
2.8
BEST
3.5
Maximum Focal Length (35mm Film Equiv)
Unknown - Click to provide data 82.5mm
Minimum Focal Length (35mm Film Equiv)
Unknown - Click to provide data 27mm
Focal Length Range (f-F)
Unknown - Click to provide data 18 - 55
Fixed Focal Length
55mm Unknown - Click to provide data
Lens Type
 Standard
 Standard
Lens Structure (elements/groups)
9/7 8/7
Lens Mount Interface
 Pentax K
 Pentax KA
 Pentax KAF
 Pentax KAF2
 Sony A
 Pentax K
 Pentax KA
 Pentax KAF
 Pentax KAF2
 Sony A
Number of Diaphragm Blades
9
BEST
7
Filter Size
67mm 55mm
Mounting Type
 Bayonet
 Bayonet

Focusing

Auto Focusing (AF) Modes
 single
 continuous
 spot
 Single Auto Focus
 Continuous Auto Focus
 Spot Auto Focus
 single
 continuous
 spot
 Single Auto Focus
 Continuous Auto Focus
 Spot Auto Focus
Auto Focus (AF) Lock
 Auto Focus (AF) lock
 Auto Focus (AF) lock
Auto Focus (AF) Assist Beam
 Auto Focus (AF) assist beam
Unknown - Click to provide data
Closest Focusing Distance
0.5m Unknown - Click to provide data
Auto Focus (AF) Points
27 Unknown - Click to provide data
Focus Adjustment
 Auto
 Manual
 Auto/Manual
 Auto
 Manual
 Auto/Manual
Focus
 TTL
 TTL

Light Exposure

Light Exposure Modes
 shutter priority
 aperture priority
 Auto
 Manual
 Shutter priority AE
 Aperture priority AE
 shutter priority
 aperture priority
 Auto
 Manual
 Shutter priority AE
 Aperture priority AE
ISO Sensitivity
 Auto
 50
 80
 100
 200
 800
 12800
 51200
 25600
 25
 Auto
 50
 80
 100
 200
 800
 12800
 51200
 25600
 25
ISO Sensitivity (max)
204,800
BEST
51,200
ISO Sensitivity (min)
100 50
BEST
Auto Exposure (AE) Lock
 Auto Exposure (AE) lock
Unknown - Click to provide data
Light Metering
 Evaluative (Multi-pattern)
 Centre-weighted
 Spot
 Evaluative (Multi-pattern)
 Centre-weighted
 Spot
Light Exposure Correction
 ±5EV (1/2; 1/3 EV step)
 ±5EV (1/2; 1/3 EV step)
Light Exposure Control
 Program AE
 Program AE

Shutter

Slowest Camera Shutter Speed
30s 30s
Fastest Camera Shutter Speed
1s 1s
Camera Shutter Type
 Electronic
 Electronic

Flash

Flash Modes
 Flash on
 Red-eye reduction
 Slow synchronization
 Auto
 Fill-in
 Flash off
 Flash on
 Red-eye reduction
 Slow synchronization
 Auto
 Fill-in
 Flash off
Flash Sync-Speed
1s Unknown - Click to provide data
Flash Exposure Compensation
 Flash exposure compensation
Unknown - Click to provide data
Flash Exposure Lock
 Flash exposure lock
Unknown - Click to provide data
Flash Exposure Correction
 ±3EV (1/2; 1/3 EV step)
 ±3EV (1/2; 1/3 EV step)
BEST

Video

Full HD Video
Unknown - Click to provide data
 Full HD video
Maximum Video Resolution
 1920 x 1080
 1920 x 1080
Video Formats Supported
 AVI
 M-JPEG
 MPEG
 MPEG4
 H.264
BEST
 AVI
 M-JPEG
 MPEG
 MPEG4
 H.264
Video Resolutions
 1920 x 1080
 1280 x 720
BEST
 1920 x 1080
 1280 x 720
Video Recording
 Video recording
 Video recording
HD Type
 Full HD
 Full HD

Audio

Built-In Microphone
 Built-in microphone
 Built-in microphone
Audio Formats Supported
 MP4
 AC3
 LC-AAC
 AAC++
 MP4
 AC3
 LC-AAC
 AAC++
BEST
Voice Recording
 Voice recording
 Voice recording
Noise Reduction
 Noise reduction
Unknown - Click to provide data

Memory

Compatible Memory Cards
 SDXC
 SDHC
 SD
 Eye-Fi
 FLU
 MS PRO
 MS PRO Duo
 MSXC
 MS XC-HG Duo
 SDXC
 SDHC
 SD
 Eye-Fi
 FLU
 MS PRO
 MS PRO Duo
 MSXC
 MS XC-HG Duo
Memory Slots
2 Unknown - Click to provide data

Display

Display Diagonal
3.2"
BEST
3"
Display
 LCD
 LCD
Vari-Angle LCD Display
Unknown - Click to provide data
 Vari-angle LCD display
Field of View
98% 100%
BEST
Display Resolution (numeric)
1,037,000 pixels 1,228,800 pixels
BEST

Viewfinder

Viewfinder Screen Size
Unknown - Click to provide data 0.5"
Magnification
0.17x Unknown - Click to provide data
Viewfinder Type
 Electronic
 Electronic

Ports & Interfaces

DC-In Jack
 DC-in jack
Unknown - Click to provide data
USB Connector Type
 Micro-USB B
 Micro-USB B
HDMI
 HDMI
 HDMI
HDMI Connector Type
 Micro
 Micro
USB Version
 3.0
BEST
 3.0
USB Connector
 Micro-USB
 Micro-USB B
 Micro-USB
 Micro-USB B

Camera

White Balance
 Auto
 Tungsten
 Fluorescent
 Cloudy
 Daylight
 Shade
 Flash
 Fluorescent L
 Incandescent
 Auto
 Tungsten
 Fluorescent
 Cloudy
 Daylight
 Shade
 Flash
 Fluorescent L
 Incandescent
Shooting Modes
 Auto
 Program
 Shutter priority
 Aperture priority
 Manual
 Auto
 Program
 Shutter priority
 Aperture priority
 Manual
Photo Effects
 Black&White
 Neutral
 Sepia
 Vivid
 Black&White
 Neutral
 Sepia
 Vivid
Self-Timer Delay
2,12 2,10
Histogram
 Histogram
 Histogram
Playback Zoom (max)
16x Unknown - Click to provide data
Dioptre Correction
 Dioptre correction
 Dioptre correction
Anti-Dust Function
Unknown - Click to provide data
 Anti-dust function
Image Editing
 Resizing
 Rotating
 Crop
 Resizing
 Rotating
 Crop
Camera File System
 DCF 2.0
 Exif 2.3
 RAW
 DCF
 Exif
 DCF 2.0
 Exif 2.3
 RAW
 DCF
 Exif
Live View
 Live view
 Live view
Camera Playback
 Movie
 Single image
 Slide show
 Movie
 Single image
 Slide show
Saturation Adjustment
 Saturation adjustment
 Saturation adjustment
Contrast Adjustment
 Contrast adjustment
 Contrast adjustment
Brightness Adjustment
 Brightness adjustment
 Brightness adjustment
Built-In Processor
PRIME III Unknown - Click to provide data
Diopter Adjustment (D-D)
-3.5 - 2 -4 - 3
Scene Modes
 Snow
 Landscape
 Portrait
 Night
 Night portrait
 Sports
 Sunset
 Twilight
 Snow
 Landscape
 Portrait
 Night
 Night portrait
 Sports
 Sunset
 Twilight
Languages Support
 Multi
 Multi

Weight & Dimensions

Weight
1.5kg 647g
BEST
Height
117mm 104.2mm
Depth
123mm 80.9mm
Width
156mm 142.6mm
Lens Weight
416g 210g
BEST
Lens Length
81.3mm 69mm
BEST
Lens Diameter
68.2mm
BEST
69.5mm
Weight (including Battery)
1.6kg 726g
BEST

Battery

Power Source Type
 USB
 Battery
 USB
 Battery
Battery Technology
 Lithium-Ion (Li-Ion)
BEST
 Lithium-Ion (Li-Ion)
Number of Batteries Supported
1 1
Battery Type
D-LI90 NP-FM500H
Battery Capacity
Unknown - Click to provide data 1,650mAh
Battery Life (CIPA Standard)
650 shots
BEST
480 shots
Battery Voltage
Unknown - Click to provide data 7.2V

Packaging Content

Bundled Software
Digital Camera Utility 4 (Ver.4.20) Unknown - Click to provide data
Cables Included
 AC
 USB
 Micro-USB
 AC
 USB
 Micro-USB
Batteries Included
 Batteries included
 Batteries included
Battery Charger Included
 Battery charger included
 Battery charger included
Hand Strap
 Hand strap
Unknown - Click to provide data
Quick Start Guide
 Quick start guide
Unknown - Click to provide data

Networking

Wi-Fi
Unknown - Click to provide data
 Wi-Fi
Near Field Communication (NFC)
Unknown - Click to provide data
 Near Field Communication (NFC)

Other Features

Built-In Flash
 Built-in flash
 Built-in flash

Technical Details

Image Processor
 BIONZ
 BIONZ
Self-Timer
Unknown - Click to provide data
 Self-timer
Feedback