Pentax K-x Review

October 28, 2009 | Mark Goldstein |


Camera Type TTL autofocus, auto-exposure digital SLR digital-still camera with built-in retractable P-TTL auto pop-up flash
Type 23.6mm x 15.8mm CMOS with a primary colour filter
Total Pixels approx. 12.9 megapixels
Effective Pixels approx. 12.4 megapixels
Still RAW: [12M] 4288x2428 pixels. JPEG: [12M] 4288x2428 pixels, [10M] 3936x2624 pixels, [6M] 3072x2048 pixels, [2M] 1728x1152 pixels.
Movie [0.9M] 1280x720(16:9),  [0.3M] 640x416(3:2) 
Colour Depth 12 bit x 3 colours
Sensitivity Auto, Manual: 200-6400 (1EV steps or 1/2EV steps or 1/3EV steps).  Bulb mode: up to ISO1600, Could be expanded to ISO 100-12800
Sensor Cleaning Image sensor moving mechanism and SP Coating Dust alert function
Mount PENTAX KAF2 bayonet mount
Usable lenses PENTAX KAF3-, KAF2-, KAF-, and KA-mount lenses.  * Power zoom function is not available. K-mount lenses usable with restrictions.  S-mount lenses, 67/645 lenses usable with adapter and with restrictions.
Focusing System
Type TTL phase difference detection
Functions AF.A(auto), AF.S(single, with focus lock), AF-C(continuous)*, Manual focus.  * Auto Picture and Picture mode: only when the Action mode is selected.
* Scene mode: only when the Kids, Pet, Stage lighting and Night snap mode are selected. 
* P/Sv/Tv/Av/M/B: AF.A, AF.S or AF.C selectable11-point wide autofocus system (SAFOX VIII)
AF assist avaiable (by Built-in Flash)
Type Fixed molded penta-mirror type
Field of View approx. 96%
Magnification approx. 0.85X (with 50mm F1.4 lens, infinity, -1m-1)
Focusing screen Natural-Bright-Matte II focusing screen
Diopter adjustment approx. -2.5 - +1.5m-1
Type 2.7" TFT colour LCD monitor
Brightness adjustable
Wide angle view
approx. 230,000 dots
Playback Single frame, 4-image display, 9-image display, 16-image display, 36-image display, Zoom display (up to 16 times, scrolling possible), Image comparison, Rotating, Folder, Calendar, Slideshow, Histogram, Bright/Dark area, Resize, Trimming, Index
Type Electronically controlled vertical-run focal plane shutter
Speed Auto: 1/6000 - 30 sec. and bulb,  Manual: 1/6000 - 30 sec., and bulb
X-Synchronization Hot shoe, sync-speed: 1/180 sec., P-TTL, high-speed-sync, wireless-sync with PENTAX dedicated flash
Exposure system
Metering TTL open-aperture 16-segment metering (coupled with lens and AF information)Multi-segment metering
Centre-weighted metering
Spot metering
Exposure Modes Auto Picture mode
Picture mode
Scene mode
Program AE
Sensitivity-Priority AE
Shutter-Priority AE
Aperture-Priority AE
Metered Manual
Bulb Picture modes: Portrait, Landscape, Macro, Action, Night scene portrait, Standard Flash-Off Scene Modes: Night Scene, Surf & Snow, Food, Sunset, Kids, Pet, Candlelight, Museum.
Metering Range EV1-21.5 (Standard Output Sensitivity 200 with 50mm F1.4 lens)
Auto Exposure Lock This function can be allocated to AF button in Menu.
Compensation ±3EV (0.5EV steps or 0.3EV steps)
Auto Bracketing 3 frames within range of ±0.5EV,  ±1.0EV, ±1.5EV (0.5EV steps) or ±0.3EV, ±0.7EV, ±1.0EV (0.3EV steps)
Type Built-in retractable P-TTL pop-up flash
Guide Number approx. 16 (Standard Output Sensitivity 200/m) 12 (Standard Output Sensitivity 100/m)
Angle of View Coverage 28mm wide-angle (equivalent to 35mm)
Exposure Compensation -2 EV - +1EV (1/2EV steps)
Exposure Parameters
Modes Single-frame , Continuous (Hi, Lo), Self-timer (12s, 2s), Remote control (0s, 3s), Auto bracket
White Balance Auto, Daylight, Shade, Cloudy, Tungsten Light, Fluorescent Light (W, D, N, L (Light Bulb) ), Flash, CTE, Manual setting, with WB fine adjustment
Digital Filter Rec. mode: Toy camera, High contrast, Soft, Star burst, Retro, Extract color, Fish eye, Custom Playback: Toy camera, High contrast, Soft, Star burst, Retro, Extract color, Illustration(Pastel, Water color), Fish Eye, HDR, B&W, Sepia, Color, Slim, Miniature, Brightness, Base Tweaking, Custom
Recording [0.9M] 1280x720, 16:9,  [0.3M] 640x416, 3:2
External SD memory card , SDHC memory card compattible
File Format RAW (Original/DNG), JPEG (Conforms to Exif 2.21), Conforms to DCF (Design rule of Camera File system) 2.0Motion JPEG (AVI) 24FPSYes. Built in microphoneStill:*(Good), **(Better), ***(Best), ****(Excellent)
Special Features
Features 75 cities (28 time zones)
Interface USB/Video; USB 2.0 (HI-SPEED)Compatible with NTSC and PAL formats
Source Four AA (lithium, alkaline, and rechargeable Ni-MH) batteries Optional AC adapter also available.
Performance Number of recordable images (Lithium): approx. 1900 (Normal Recording)*2 , 1100 (50% use Flash)*1
Playback time: approx. 680 minutes*2 Number of recordable images (Ni-MH 1900mAh): approx. 640 (Normal Recording)*2 , 420 (50% use Flash)*1
Playback time: approx. 390 minutes*2 Number of recordable images (Alkaline): approx. 210 (Normal Recording)*2 , 130 (50% use Flash)*1
Playback time: approx. 350 minutes*2 *1 Recording capacity shows approximate number of shots recorded during CIPA-compliant testing. Actual performance may vary depending on operating conditions.
*2 According to the result of PENTAX in-house testing.
Height 91.5mm
Width 122.5mm
Depth 67.5mm
Weight approx. 515g without battery and SD memory card approx. 580g loaded and ready with lithium battery and SD memory card approx. 615g loaded and ready with alkaline battery and SD memory card