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Pentax K-x vs Sony A33

Portability
69
Imaging
52
Features
47
Overall
50
Pentax K-x front
 
Sony SLT-A33 front
Portability
67
Imaging
54
Features
80
Overall
64

Pentax K-x vs Sony A33 Key Specs

Pentax K-x
(Full Review)
  • 12MP - APS-C Sensor
  • 2.7" Fixed Display
  • ISO 100 - 6400 (Bump to 12800)
  • Sensor based Image Stabilization
  • 1/6000s Maximum Shutter
  • 1280 x 720 video
  • Pentax KAF2 Mount
  • 580g - 123 x 92 x 68mm
  • Launched December 2009
Sony A33
(Full Review)
  • 14MP - APS-C Sensor
  • 3" Fully Articulated Screen
  • ISO 100 - 12800 (Raise to 25600)
  • Sensor based Image Stabilization
  • 1920 x 1080 video
  • Sony/Minolta Alpha Mount
  • 500g - 124 x 92 x 85mm
  • Announced August 2010
  • Newer Model is Sony A35
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Pentax K-x vs Sony A33 Overview

Let's take a more detailed look at the Pentax K-x vs Sony A33, both Entry-Level DSLR cameras by rivals Pentax and Sony. The image resolution of the K-x (12MP) and the A33 (14MP) is pretty comparable and they enjoy the exact same sensor dimensions (APS-C).

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The K-x was introduced 8 months earlier than the A33 so they are of a similar age. Each of the cameras come with the identical body type (Compact SLR).

Before delving through a more detailed comparison, below is a short summary of how the K-x grades versus the A33 with respect to portability, imaging, features and an overall mark.

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Reasons to pick Pentax K-x over the Sony A33

 K-x A33 

Reasons to pick Sony A33 over the Pentax K-x

 A33 K-x 
AnnouncedAugust 2010December 2009Newer by 8 months
Screen typeFully ArticulatedFixed Fully Articulating screen
Screen dimension3"2.7"Bigger screen (+0.3")
Screen resolution921k230kCrisper screen (+691k dot)
Selfie screen Easy selfies

Common features in the Pentax K-x and Sony A33

 K-x A33 
Manual focus Dial precise focus
Touch friendly screen Neither offers Touch friendly screen

Pentax K-x vs Sony A33 Physical Comparison

In case you're going to travel with your camera frequently, you need to consider its weight and dimensions. The Pentax K-x offers outer dimensions of 123mm x 92mm x 68mm (4.8" x 3.6" x 2.7") with a weight of 580 grams (1.28 lbs) and the Sony A33 has dimensions of 124mm x 92mm x 85mm (4.9" x 3.6" x 3.3") having a weight of 500 grams (1.10 lbs).

Examine the Pentax K-x vs Sony A33 in our brand new Camera plus Lens Size Comparison Tool. Camera Size Comparison with Lenses

Bear in mind, the weight of an ILC will change depending on the lens you are utilizing during that time. Below is the front view physical size comparison of the K-x vs the A33.

Pentax K-x vs Sony A33 size comparison

Taking into consideration dimensions and weight, the portability grade of the K-x and A33 is 69 and 67 respectively.

Pentax K-x vs Sony A33 top view buttons comparison

Pentax K-x vs Sony A33 Sensor Comparison

Quite often, its difficult to see the gap in sensor dimensions simply by checking out a spec sheet. The image underneath will give you a much better sense of the sensor sizes in the K-x and A33.

Clearly, both of the cameras have got the exact same sensor measurements albeit not the same MP. You can expect the Sony A33 to produce extra detail using its extra 2MP. Higher resolution can also let you crop pictures much more aggressively. The more aged K-x will be behind in sensor tech.

Pentax K-x vs Sony A33 sensor size comparison

Pentax K-x vs Sony A33 Screen and ViewFinder

Pentax K-x vs Sony A33 Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Pentax K-x Portrait photography information
Sony A33 Portrait photography information
63
has manual focus
sensor size is good (APS-C)
includes face detect autofocus
saves RAW files
low resolution sensor (12MP)
72
focusing manually
good resolution (14 megapixels)
good sensor size (APS-C)
features face detect focus
supports RAW files
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Street Comparison

Pentax K-x Street photography factors
Sony A33 Street photography factors
67
built in image stabilization (Sensor based)
sensor size is good (APS-C)
saves RAW files
screen does not articulate
76
screen can move to multiple angles
image stabilization (Sensor based)
good sensor size (APS-C)
supports RAW files
Photography Glossary

Sports Comparison

Pentax K-x Sports photography advice
Sony A33 Sports photography advice
61
max shutter speed is good (1/6,000s)
built in image stabilization (Sensor based)
sensor size is good (APS-C)
good battery (1,900 CIPA)
supports phase detect autofocus
max frames per second very slow (5.0 fps)
low resolution sensor (12 megapixels)
67
image stabilization (Sensor based)
good resolution (14 megapixels)
good sensor size (APS-C)
comes with phase detect auto focus
not so great battery pack (340 CIPA)
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Travel Comparison

Travel photography with Pentax K-x
Travel photography with Sony A33
54
good battery (1,900 shots)
flash built-in
lack of Time Lapse function
low resolution sensor (12MP)
screen isn't selfie friendly
61
good resolution (14MP)
built-in flash
screen is selfie friendly
does not have Timelapse function
not so great battery pack (340 CIPA)
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Landscape Comparison

Landscape photography with Pentax K-x
Landscape photography with Sony A33
61
has manual focus
swap lenses (Pentax KAF2 mount)
built in image stabilization (Sensor based)
sensor size is good (APS-C)
saves RAW files
good battery (1,900 shots)
screen is small (2.7 inches)
low resolution sensor (12 megapixels)
lack of Time Lapse function
67
focusing manually
interchangeable lenses (Sony/Minolta Alpha mount)
screen size is good (3 inches)
image stabilization (Sensor based)
good resolution (14MP)
good sensor size (APS-C)
supports RAW files
not so great battery pack (340 shots)
does not have Timelapse function
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Vlogging Comparison

Pentax K-x Vlogging advice
Sony A33 Vlogging advice
27
built in image stabilization (Sensor based)
includes face detect autofocus
screen isn't selfie friendly
low quality video (1280 x 720 pixels)
lack of mic port
77
screen is selfie friendly
image stabilization (Sensor based)
features face detect focus
high res video (1920 x 1080 resolution)
does have microphone support
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Pentax K-x vs Sony A33 Specifications

Detailed spec comparison table for Pentax K-x and Sony A33
 Pentax K-xSony SLT-A33
General Information
Company Pentax Sony
Model Pentax K-x Sony SLT-A33
Class Entry-Level DSLR Entry-Level DSLR
Launched 2009-12-23 2010-08-24
Physical type Compact SLR Compact SLR
Sensor Information
Processor Chip Prime Bionz
Sensor type CMOS CMOS
Sensor size APS-C APS-C
Sensor measurements 23.6 x 15.8mm 23.5 x 15.6mm
Sensor surface area 372.9mm² 366.6mm²
Sensor resolution 12MP 14MP
Anti aliasing filter
Aspect ratio 3:2 3:2 and 16:9
Max resolution 4288 x 2848 4592 x 3056
Max native ISO 6400 12800
Max enhanced ISO 12800 25600
Minimum native ISO 100 100
RAW data
Autofocusing
Focus manually
Autofocus touch
Continuous autofocus
Single autofocus
Autofocus tracking
Selective autofocus
Center weighted autofocus
Autofocus multi area
Autofocus live view
Face detect focus
Contract detect focus
Phase detect focus
Number of focus points 11 15
Cross focus points - 3
Lens
Lens mounting type Pentax KAF2 Sony/Minolta Alpha
Total lenses 151 143
Focal length multiplier 1.5 1.5
Screen
Display type Fixed Type Fully Articulated
Display diagonal 2.7" 3"
Resolution of display 230 thousand dots 921 thousand dots
Selfie friendly
Liveview
Touch display
Display tech TFT LCD monitor -
Viewfinder Information
Viewfinder type Optical (pentamirror) Electronic
Viewfinder resolution - 1,150 thousand dots
Viewfinder coverage 96% 100%
Viewfinder magnification 0.57x 0.73x
Features
Min shutter speed 30 secs 30 secs
Max shutter speed 1/6000 secs 1/4000 secs
Continuous shutter rate 5.0fps 7.0fps
Shutter priority
Aperture priority
Expose Manually
Exposure compensation Yes Yes
Change white balance
Image stabilization
Integrated flash
Flash range 16.00 m 10.00 m (@ ISO 100)
Flash options Auto, On, Off, Red-Eye, Slow Sync, Rear curtain, Wireless Auto, On, Off, Red-Eye, Slow Sync, High Speed Sync, Rear Curtain, Fill-in, Wireless
Hot shoe
Auto exposure bracketing
WB bracketing
Max flash synchronize 1/180 secs 1/160 secs
Exposure
Multisegment metering
Average metering
Spot metering
Partial metering
AF area metering
Center weighted metering
Video features
Video resolutions 1280 x 720 (24 fps), 640 x 416 (24 fps) 1920 x 1080 (60, 29.97 fps), 1440 x 1080 (30fps), 640 x 424 (29.97 fps)
Max video resolution 1280x720 1920x1080
Video data format Motion JPEG MPEG-4, AVCHD, H.264
Microphone support
Headphone support
Connectivity
Wireless None Eye-Fi Connected
Bluetooth
NFC
HDMI
USB USB 2.0 (480 Mbit/sec) USB 2.0 (480 Mbit/sec)
GPS None None
Physical
Environmental sealing
Water proof
Dust proof
Shock proof
Crush proof
Freeze proof
Weight 580 grams (1.28 pounds) 500 grams (1.10 pounds)
Dimensions 123 x 92 x 68mm (4.8" x 3.6" x 2.7") 124 x 92 x 85mm (4.9" x 3.6" x 3.3")
DXO scores
DXO Overall score 72 70
DXO Color Depth score 22.8 22.8
DXO Dynamic range score 12.5 12.6
DXO Low light score 811 591
Other
Battery life 1900 photos 340 photos
Type of battery Battery Pack Battery Pack
Battery model 4 x AA NP-FW50
Self timer Yes (2 or 12 sec) Yes (2 or 10 sec)
Time lapse recording
Type of storage SD/SDHC card SD/SDHC/SDXC/Memory Stick Pro Duo/ Pro-HG Duo
Card slots 1 1
Pricing at release $600 $230