Pentax K-x vs Sony A57
69 Imaging
52 Features
47 Overall
50
64 Imaging
57 Features
85 Overall
68
Pentax K-x vs Sony A57 Key Specs
(Full Review)
- 12MP - APS-C Sensor
- 2.7" Fixed Screen
- ISO 100 - 6400 (Raise to 12800)
- Sensor based Image Stabilization
- 1/6000s Maximum Shutter
- 1280 x 720 video
- Pentax KAF2 Mount
- 580g - 123 x 92 x 68mm
- Introduced December 2009
(Full Review)
Meta to Introduce 'AI-Generated' Labels for Media starting next month Pentax K-x vs Sony A57 Overview
Here, we are matching up the Pentax K-x and Sony A57, both Entry-Level DSLR cameras by manufacturers Pentax and Sony. There exists a huge gap among the sensor resolutions of the K-x (12MP) and A57 (16MP) but both cameras posses the identical sensor sizes (APS-C).
Photography GlossaryThe K-x was launched 3 years earlier than the A57 and that is a fairly significant gap as far as camera technology is concerned. The two cameras feature the same body design (Compact SLR).
Before delving straight to a comprehensive comparison, here is a concise synopsis of how the K-x matches up vs the A57 for portability, imaging, features and an overall grade.
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The following is a sample of the gallery pictures for Pentax K-x and Sony SLT-A57. The complete galleries are viewable at Pentax K-x Gallery and Sony A57 Gallery.
Reasons to pick Pentax K-x over the Sony A57
| K-x | A57 |
|---|
Reasons to pick Sony A57 over the Pentax K-x
| A57 | K-x | |||
|---|---|---|---|---|
| Announced | September 2012 |  | December 2009 | More recent by 33 months |
| Display type | Fully Articulated |  | Fixed | Fully Articulating display |
| Display size | 3" |  | 2.7" | Larger display (+0.3") |
| Display resolution | 921k |  | 230k | Crisper display (+691k dot) |
| Selfie screen |  | Take selfies |
Common features in the Pentax K-x and Sony A57
| K-x | A57 | |||
|---|---|---|---|---|
| Manual focus |  | Dial exact focusing | ||
| Touch display |  | Neither offers Touch display |
Pentax K-x vs Sony A57 Physical Comparison
For those who are intending to lug around your camera often, you have to take into account its weight and proportions. The Pentax K-x offers exterior dimensions of 123mm x 92mm x 68mm (4.8" x 3.6" x 2.7") having a weight of 580 grams (1.28 lbs) whilst the Sony A57 has measurements of 132mm x 98mm x 81mm (5.2" x 3.9" x 3.2") and a weight of 618 grams (1.36 lbs).
Examine the Pentax K-x and Sony A57 in the new Camera with Lens Size Comparison Tool.
Take into account, the weight of an Interchangeable Lens Camera will differ based on the lens you choose at the time. Underneath is a front view sizing comparison of the K-x compared to the A57.
Factoring in dimensions and weight, the portability rating of the K-x and A57 is 69 and 64 respectively.
Pentax K-x vs Sony A57 Sensor Comparison
Typically, its hard to visualise the difference in sensor measurements only by viewing technical specs. The graphic here might provide you a much better sense of the sensor dimensions in the K-x and A57.
As you have seen, both of these cameras feature the identical sensor size but not the same megapixels. You should anticipate the Sony A57 to provide you with greater detail utilizing its extra 4MP. Greater resolution can also make it easier to crop photos way more aggressively. The older K-x will be disadvantaged in sensor technology.
Pentax K-x vs Sony A57 Screen and ViewFinder
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Pentax K-x vs Sony A57 Specifications
| Pentax K-x | Sony SLT-A57 | |
|---|---|---|
| General Information | ||
| Brand | Pentax | Sony |
| Model | Pentax K-x | Sony SLT-A57 |
| Type | Entry-Level DSLR | Entry-Level DSLR |
| Introduced | 2009-12-23 | 2012-09-13 |
| Physical type | Compact SLR | Compact SLR |
| Sensor Information | ||
| Processor | Prime | - |
| Sensor type | CMOS | CMOS |
| Sensor size | APS-C | APS-C |
| Sensor dimensions | 23.6 x 15.8mm | 23.5 x 15.6mm |
| Sensor area | 372.9mm² | 366.6mm² |
| Sensor resolution | 12MP | 16MP |
| Anti aliasing filter | ||
| Aspect ratio | 3:2 | 3:2 and 16:9 |
| Full resolution | 4288 x 2848 | 4912 x 3264 |
| Max native ISO | 6400 | 16000 |
| Max boosted ISO | 12800 | 25600 |
| Lowest native ISO | 100 | 100 |
| RAW images | ||
| Autofocusing | ||
| Manual focus | ||
| AF touch | ||
| Continuous AF | ||
| Single AF | ||
| Tracking AF | ||
| Selective AF | ||
| Center weighted AF | ||
| AF multi area | ||
| AF live view | ||
| Face detection focusing | ||
| Contract detection focusing | ||
| Phase detection focusing | ||
| Number of focus points | 11 | 15 |
| Cross focus points | - | 3 |
| Lens | ||
| Lens mounting type | Pentax KAF2 | Sony/Minolta Alpha |
| Available lenses | 151 | 143 |
| Crop factor | 1.5 | 1.5 |
| Screen | ||
| Type of screen | Fixed Type | Fully Articulated |
| Screen diagonal | 2.7 inches | 3 inches |
| Screen resolution | 230k dots | 921k dots |
| Selfie friendly | ||
| Liveview | ||
| Touch friendly | ||
| Screen technology | TFT LCD monitor | Xtra Fine TFT drive with TruBlack technology |
| Viewfinder Information | ||
| Viewfinder type | Optical (pentamirror) | Electronic |
| Viewfinder resolution | - | 1,440k dots |
| Viewfinder coverage | 96 percent | 100 percent |
| Viewfinder magnification | 0.57x | 0.7x |
| Features | ||
| Lowest shutter speed | 30s | 30s |
| Highest shutter speed | 1/6000s | 1/4000s |
| Continuous shooting rate | 5.0 frames/s | 12.0 frames/s |
| Shutter priority | ||
| Aperture priority | ||
| Expose Manually | ||
| Exposure compensation | Yes | Yes |
| Change WB | ||
| Image stabilization | ||
| Built-in 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 | ||
| AEB | ||
| White balance bracketing | ||
| Highest flash synchronize | 1/180s | 1/160s |
| Exposure | ||
| Multisegment exposure | ||
| Average exposure | ||
| Spot exposure | ||
| Partial exposure | ||
| AF area exposure | ||
| Center weighted exposure | ||
| Video features | ||
| Supported video resolutions | 1280 x 720 (24 fps), 640 x 416 (24 fps) | 1920 x 1080 (60p, 24p), 1440 x 1080 (30p), 640 x 480 (30 fps) |
| Max video resolution | 1280x720 | 1920x1080 |
| Video file format | Motion JPEG | MPEG-4, AVCHD, H.264 |
| Mic port | ||
| Headphone port | ||
| 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 | ||
| Environment sealing | ||
| Water proof | ||
| Dust proof | ||
| Shock proof | ||
| Crush proof | ||
| Freeze proof | ||
| Weight | 580 gr (1.28 lb) | 618 gr (1.36 lb) |
| Physical dimensions | 123 x 92 x 68mm (4.8" x 3.6" x 2.7") | 132 x 98 x 81mm (5.2" x 3.9" x 3.2") |
| DXO scores | ||
| DXO All around score | 72 | 75 |
| DXO Color Depth score | 22.8 | 23.4 |
| DXO Dynamic range score | 12.5 | 13.0 |
| DXO Low light score | 811 | 785 |
| Other | ||
| Battery life | 1900 photographs | 550 photographs |
| Battery type | Battery Pack | Battery Pack |
| Battery model | 4 x AA | NP-FM500H |
| Self timer | Yes (2 or 12 sec) | Yes (2 or 10 sec) |
| Time lapse recording | ||
| Storage type | SD/SDHC card | SD/SDHC/SDXC/Memory Stick Pro Duo/ Pro-HG Duo |
| Card slots | One | One |
| Launch price | $600 | $1,000 |