Pentax 645Z vs Sony Alpha A77

(46)
Pentax 645Z
Sony Alpha A77

Top Prices

MobiCity UK
Out of stock
Photovideodirect
Delivery unknown
In stock
DigitalRev UK
Delivery unknown
In stock
Amazon UK
FREE Standard delivery
In stock

Reasons For

6 Reasons For
Vastly higher megapixel count Edit
The Pentax 645Z has a megapixel count 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 megapixel count Edit
The Pentax 645Z has a total megapixel count of 52.99MP, whereas the Sony Alpha A77 is only a 24.7MP digital camera (28.29MP less).
Hugely higher maximum ISO speed Edit
The Pentax 645Z has a maximum ISO speed of 204,800, but the Sony Alpha A77 is only a 51,200 maximum ISO speed digital camera (153,600 lower).
0.2" larger screen size Edit
The Pentax 645Z has a screen size 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.

One hundred and seventy more shots per battery charge Edit
The Pentax 645Z is a digital camera that takes 650.00 shots per battery charge, whereas the Sony Alpha A77 only takes 480.00 shots per battery charge. 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.

Available from 6 shops
The more stores stock this digital camera, the greater competition amongst stores to keep prices low.
5 Reasons For
50 smaller minimum ISO speed 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 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.

Cheaper by £4,928
The Sony Alpha A77 costs £950.71, whereas the Pentax 645Z is £5,878.95.

Reasons Against

6 Reasons Against
A lot bigger minimum ISO speed Edit
The Pentax 645Z has a minimum ISO speed of 100, 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 Edit
The Pentax 645Z has a display resolution of 1,037,000 pixels, 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.

£4,928 more expensive
The Pentax 645Z is more expensive than the Sony Alpha A77 by £4,928.24.
Three months older
The Pentax 645Z is older than the Sony Alpha A77 by three months.
6 Reasons Against
27.1MP lower megapixel count 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 megapixel count Edit
The Sony Alpha A77 is a 24.7MP digital camera. That's 28.29MP less than the Pentax 645Z (24.7MP).
153,600 lower maximum ISO speed Edit
The Sony Alpha A77 is a 51,200 maximum ISO speed digital camera. That's 153,600 lower than the Pentax 645Z (51,200).
Smaller screen size Edit
The Sony Alpha A77 has a screen size 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.

Only 480.00 shots per battery charge Edit
The Sony Alpha A77 is a digital camera that takes 480.00 shots per battery charge, whereas the Pentax 645Z only takes 650.00 shots per battery charge. 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.

Not as many stockists
The Sony Alpha A77 is only stocked by 1 retailer, however the Pentax 645Z is stocked by 7 stores. Read more
Fewer numbers of sellers reduces the chances of the product remaining in stock and also reduces the price competition amongst retailers for this digital camera.

Awards

4 Awards
Ephotozine: Highly Recommended
Imaging Resource.com: Dave's Pick
PC Mag: Editor's Choice
PhotographyBlog.com: Essential
No awards found

Average Expert Rating

No reviews found

Average User Rating

No reviews found

Date Released

27 months Ago 23 months Ago

Picture Quality

Camera Type
 SLR
 SLR
Megapixel Count
51.4MP
BEST
24.3MP
Image Stabiliser
 Image stabiliser
 Image stabiliser
Sensor Type
 CMOS
 CMOS
Still Image Resolution
 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 Format
 RAW
 JPG
 TIF
 EXIF
 RAW
 JPG
 TIF
 EXIF
Full-Frame Sensor Size
44 x 33 23.5 x 15.6
Total Megapixel Count
52.99MP
BEST
24.7MP
Sensor Format
 Advanced Photo System type-C (APS-C)
 Advanced Photo System type-C (APS-C)
Aspect Ratio
 16:9
 3:2
 16:9
 3:2
BEST

Design

Colour
 Black
 Black

Lens System

Digital Zoom
Unknown - Click to provide data 4x
Maximum Aperture
Unknown - Click to provide data 22
Minimum Aperture
Unknown - Click to provide data 3.5
Focal Length Range
Unknown - Click to provide data 18 - 250
Lens Structure
Unknown - Click to provide data 16/13
Lens Mount Interface
 Pentax K
 Pentax KA
 Pentax KAF
 Pentax KAF2
 Sony A
 Pentax K
 Pentax KA
 Pentax KAF
 Pentax KAF2
 Sony A
Diaphragm Blades
Unknown - Click to provide data 7
Filter Size
Unknown - Click to provide data 62mm

Focusing

Auto Focus
 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 Lock
 Auto focus lock
 Auto focus lock
Auto Focus Assist Beam
 Auto focus assist beam
Unknown - Click to provide data
Auto Focus Point
27 Unknown - Click to provide data
Focus
 Auto
 Manual
 Auto/Manual
 Auto
 Manual
 Auto/Manual
Focus Mode
 TTL
 TTL

Light Exposure

Light Exposure Mode
 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 Speed
 Auto
 50
 80
 100
 200
 800
 12800
 51200
 25600
 25
 Auto
 50
 80
 100
 200
 800
 12800
 51200
 25600
 25
Maximum ISO Speed
204,800
BEST
51,200
Minimum ISO Speed
100 50
BEST
Auto Exposure Lock
 Auto exposure lock
Unknown - Click to provide data
Light Metering Mode
 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

Maximum Camera Shutter Speed
30s 30s
Minimum Camera Shutter Speed
1s 1s
Camera Shutter
 Electronic
 Electronic

Flash

Flash Mode
 Flash on
 Red-eye reduction
 Slow synchronization
 Fill-in
 Flash off
 Auto
 Flash on
 Red-eye reduction
 Slow synchronization
 Fill-in
 Flash off
 Auto
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

Maximum Video Resolution
 1920 x 1080
 1920 x 1080
Video Format
 AVI
 M-JPEG
 MPEG
 MPEG4
 H.264
BEST
 AVI
 M-JPEG
 MPEG
 MPEG4
 H.264
Video Resolution
 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 Format
 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

Memory Card
 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 Slot
2 Unknown - Click to provide data

Display

Screen Size
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
1,037,000 pixels 1,228,800 pixels
BEST

Viewfinder

Viewfinder Screen Size
Unknown - Click to provide data 0.5"
Viewfinder
 Electronic
 Electronic

Ports & Interfaces

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

Camera

White Balance Mode
 Auto
 Tungsten
 Fluorescent
 Cloudy
 Daylight
 Shade
 Flash
 Fluorescent L
 Incandescent
 Auto
 Tungsten
 Fluorescent
 Cloudy
 Daylight
 Shade
 Flash
 Fluorescent L
 Incandescent
Shooting Mode
 Auto
 Program
 Shutter priority
 Aperture priority
 Manual
 Auto
 Program
 Shutter priority
 Aperture priority
 Manual
Photo Effect
 Black&White
 Neutral
 Sepia
 Vivid
 Black&White
 Neutral
 Sepia
 Vivid
Self-Timer
2,12 2,10
Histogram
 Histogram
 Histogram
Maximum Playback Zoom
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 Mode
 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
Playback Mode
 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
-3.5 - 2 -4 - 3
Scene Mode
 Snow
 Landscape
 Portrait
 Night
 Night portrait
 Sports
 Sunset
 Twilight
 Snow
 Landscape
 Portrait
 Night
 Night portrait
 Sports
 Sunset
 Twilight
Display Language
 Multi
 Multi

Weight & Dimensions

Weight
1.5kg 647g
BEST
Height
117mm 104.2mm
Depth
123mm 80.9mm
Width
156mm 142.6mm
Lens Weight
Unknown - Click to provide data 470g
Lens Length
Unknown - Click to provide data 88.6mm
Lens Diameter
Unknown - Click to provide data 73.5mm
Weight Including Battery
1.6kg 726g
BEST

Battery

Power Source
 USB
 Battery
 USB
 Battery
Battery
 Lithium-Ion (Li-Ion)
BEST
 Lithium-Ion (Li-Ion)
Supported Battery
1 1
Battery Size
D-LI90 NP-FM500H
Battery Capacity
Unknown - Click to provide data 1,650mAh
Shot Per Battery Charge
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
Included Cable
 AC
 USB
 Micro-USB
 AC
 USB
 Micro-USB
Battery Included
 Battery included
 Battery included
Included Battery Charger
 Included battery charger
 Included battery charger
Hand Strap
 Hand strap
Unknown - Click to provide data
Quick Start Guide
 Quick start guide
Unknown - Click to provide data

Networking

WiFi Connectivity
Unknown - Click to provide data
 WiFi connectivity
Near Field Communication
Unknown - Click to provide data
 Near field communication

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