Pentax K-x

Released September, 2009
  • 12.2 MP
  • APS-C 23.6 x 15.8 mm CMOS
  • 2.7" LCD
It records a large, high quality image with smooth motion.
by DPReview (Dec, 2009)
9.3 Out of 10

Camera Rocket Review Our evaluation of the Pentax K-x

Image Quality

RAW image quality independent of lens

Pentax K-x
DxOMark Low light, DxOMark Color depth and DxOMark Dynamic range


How fast and easily does the camera nail focus

Pentax K-x
Focus lag, cross type focus points and focus points


How much delay is there between you and your photo?

Pentax K-x
Focus lag, continuous shooting and Startup delay


What do the experts think?

Pentax K-x
Reviews from,,, and 1 more


Camera Rocket Score

Image Quality, Focusing, Responsiveness and Reviews

Pentax K-x

Benchmarks Real world tests of the Pentax K-x

Low light image quality Highest ISO setting that still achieves great image quality

Pentax K-x
811 ISO
1,131 ISO
Pentax K-30
1,129 ISO

Resolution Results from photos of standard resolution charts

Pentax K-x
2,600 LPH
EOS 550D
2,100 LPH
Pentax K-30
3,000 LPH

Focus lag Delay between fully pressing shutter to image capture

Pentax K-x
97 ms
EOS 600D
283 ms
276 ms

Shutter lag Delay to take a photo when prefocused

Pentax K-x
82 ms
114 ms
EOS 1100D
113 ms

Startup delay Delay from power on to first photo

Pentax K-x
600 ms
EOS 600D
1,500 ms
Pentax K-30
1,100 ms

Continuous shooting Delay between fully pressing shutter to image capture

Pentax K-x
4.7 fps
2.8 fps
EOS 1100D
3 fps

Photo Gallery Wallpaper quality closeups of the camera

Reviews Word on the street for the Pentax K-x

The K-x's sensor is APS-C size and therefore you can't quite create the same depth of field effects as on a full-frame-camera such as the Canon EOS 5D Mark II but you still get a much shallower, more cinematic depth of field than with any digital compact camera.

The Pentax K-x lets you dial in shutter speeds of up to 30 seconds and has a Bulb mode as well, which is very good news if you are seriously interested in night photography.

Pentax rightfully considers ISO 12,800 (and ISO 100) an expanded mode, though I'd probably add ISO 6,400 to that as well.

The K-x gives you control over the aperture by default - just like in still mode, the aperture blinks on the display if you're going to end up with an under-exposed video.


8.5 Out of 10

What People Are Saying Give it to me straight


Pentax's 18-55mm kit lens doesn't display a lot of distortion at its widest, and the body's optional internal distortion correction does a pretty good job of fixing what little there is.
by c|net (Mar, 2010)
This extra speed isn't much use on its own, but if you plan on buying particularly bright lenses it could come into its own for shallow depth-of-field jobs.
by TechRadar (Oct, 2009)
In addition to the traditional PASM exposure modes, Pentax offers a Sensitivity-Priority option (Sv), which automatically adjusts shutter speed and aperture as you scroll through a user-determined range of ISO sensitivity values.
by c|net (Mar, 2010)


For everyday shooting this is not much of an issue but as soon as very precise or selective focusing is required you might run into problems.
by DPReview (Dec, 2009)
If you use single-point AF, there's no reminder if you've moved it (without routinely looking at the LCD for confirmation).
by c|net (Mar, 2010)
The K-x doesn't have a dedicated AF assist lamp, instead it strobes the flash unit (if raised) to provide additional illumination to the AF system.
by DPReview (Dec, 2009)


You can define a behavior for any given scenario: the function depends upon whether the camera is set for JPEG, raw only, or raw+JPEG, and you can define the override you want for each as well as whether it's sticky or cancels after one shot.
by c|net (Mar, 2010)
For instance, the ISO screen lets you choose Auto or a fixed value, as well as the auto range it can choose from; the latter is usually buried in a menu somewhere.
by c|net (Mar, 2010)
The Pentax K-x has 3 different JPEG file quality settings available, with Best being the highest quality option, and it also supports RAW (Pentax's PEF format and Adobe DNG).
by Photography Blog (Oct, 2009)

Image quality

It's fast, with good photo quality and an excellent noise profile.
by c|net (Mar, 2010)
All in all the K-x is perfectly capable of producing high quality image output, especially in low light.
by DPReview (Dec, 2009)
The E-620 achieves the largest dynamic range but does so by applying technology similar to Highlight Expansion on the Pentax by default.
by DPReview (Dec, 2009)


On the control dial you can choose from the PASM and an abundance of scene modes, or switch the camera into movie mode.
by DPReview (Dec, 2009)
On the other hand, it's the cheapest video-capable dSLR (at least at the time of this review), and it's fine in a pinch.
by c|net (Mar, 2010)
On the other hand, it's the cheapest video-capable dSLR (at least at the time of this review), and it's fine in a pinch.
by c|net (Mar, 2010)

Specifications Full list of technical specs


Megapixels 12.2 MP
Resolution 4288 x 2848
Size APS-C
Area 23.6 x 15.8 mm
Crop factor 1.5x
Pixel size 30.5 microns
Light sensitivity 200 ISO to 6,400 ISO
Light sensitivity (Boost) 6,400 ISO to 12,800 ISO
  1. RAW
  2. JPEG
Self cleaning sensor Yes
Tested vertical resolution 2,600 LPH
Tested horizontal resolution 2,600 LPH

focus system

Type Phase detection
Focus points 11
Cross type focus points 9
Supports continuous No


Min 30 s
Max 1/6000 s

form factor

Size 123 x 92 x 68 mm
Thickness 68 mm
Weight 580 g
Is weather sealed No


Is a smart camera No
Includes a GPS No
Supports HDR Yes
Automatic panorama No
Create realistic 3D images No
Image stabilization Sensor shift


Video 1280 x 720 @ 24 fps
Shoots video in 24p Yes
Shoots high speed video No
External mic jack None
Autofocus while shooting video None


Type LCD
Size 2.7"
Resolution 230 k dots
Has a touch screen No
Has a flip out screen No
Supports live view Yes


Viewfinder mirror Opaque
Viewfinder Viewfinder
Type Pentamirror
Coverage 96%
Magnification 0.85x
Viewfinder size 0.56x


Max continuous shooting 4.7 fps
Battery life 420 photos
Continuous shooting 4.7 fps, JPEG
Focus lag 97 ms
Shutter lag 82 ms
Startup delay 600 ms
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