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Press Release

Sep 17, 2009

A High-Performance Entry-Class Digital SLR Camera,
Packaging Movie Recording, High-Speed Continuous Shooting
and User-Friendly Operation in Compact, Lightweight Body


HOYA CORPORATION PENTAX Products is pleased to announce the launch of the PENTAX K-x, a new lens-interchangeable digital SLR camera. This new model combines solid photographic performance with a wide array of advanced features, including Live View function and high-quality movie recording, extending high-quality digital SLR photography to all users. Its compact, lightweight body also enhances portability and maneuverability, making it ideal for many different photographic occasions.

The K-x design is based on the PENTAX K-m, an entry-class digital SLR camera launched in October 2008 that early on gained popularity for its compact, lightweight body and simple, user-friendly operations. With the addition of a newly designed CMOS image sensor and an upgraded high-performance imaging engine, the K-x offers outstanding photographic performance at nearly the same level as upper-class models. This includes high-resolution, fine-detailed images delivered by approximately 12.4 effective megapixels, super-high-sensitivity photography and high-speed continuous shooting. The K-x also features an array of advanced functions, including Live View shooting and movie recording. It also provides a pair of handy functions designed to produce highly personalized images with great ease: an upgraded digital filter function to accommodate more sophisticated image processing, and a new cross process mode to produce unexpected, eye-catching finishing touches with unique, intriguing colors. The K-x is not only the perfect camera for first-time digital SLR camera users, but also serves as the ideal backup camera for more experienced photographers.

Along with the K-x, PENTAX will also launch the smc PENTAX-DA L 55-300mmF4-5.8ED super-telephoto zoom lens as part of the K-x Twin Lens Kit package. This zoom lens was designed to be lightweight without compromising the exceptional optical performance common to all PENTAX lenses, making super-telephoto photography easier and smoother for K-x users.

PENTAX K-x Color Variation
♦ White [ ⇒ Product Image] ♦ Red [ ⇒ Product Image] ♦ Black [ ⇒ Product Image]
PENTAX K-x Twin Lens Kit package
♦ smc PENTAX-DA L 55-300mmF4-5.8ED [ ⇒ Product Image]
Major Features
  1. High-quality image reproduction

    1. Approximately 12.4 effective megapixels for true-to-life image reproduction
      The K-x incorporates a newly developed CMOS image sensor to assure high-speed image data readout and more flexible response to varying ISO sensitivity levels. With approximately 12.4 effective megapixels, this image sensor can faithfully and accurately reproduce true-to-life images with fine detail and rich depth of colors. The K-x not only offers a wide sensitivity range between ISO 200 and ISO 6400, but also allows the user to expand the sensitivity range between ISO 100 and ISO 12800 via a custom function, giving greater creative freedom to more adventurous photographers.
    2. High-performance, high-speed PRIME II imaging engine
      The K-x features the newly developed PRIME (PENTAX Real Image Engine) II, an upgrade of the original PRIME imaging engine. Thanks to new technologies supplied by Fujitsu Microelectronics Limited, this new imaging engine offers greater data processing speed and enhanced capability to produce higher-quality images with richer, more accurate color rendition, as well as faster transmission speed of movie data.
  2. Compact, lightweight body

    Despite the incorporation of the large 23.6mm x 15.8mm image sensor, the K-x is one of the most compact, lightweight digital SLR camera in its class. This is due to the combination of a compact, lightweight stainless-steel chassis, a downsized in-body shake reduction mechanism, and state-of-the-art, highly-integrated packaging methodologies that assure the most space-efficient positioning and layout of various parts.
  3. Live View function, with Face detection of up to 16 faces

    The K-x features the Live View function, which allows the user to view the image on its LCD monitor during shooting, just as for a digital compact camera. The K-x also offers a choice of three different focusing modes during Live View shooting: Contrast AF, which optimizes the focus based on the subject’s contrast; Face Detection AF, which automatically detects up to 16 faces, selects the main subject’s face from multiple faces, then captures it in sharp focus; and Phase Difference AF, which uses the AF sensor positioned in the camera body to optimize focus on the subject.
  4. High-quality recording at 1280 x 720 pixels, with HDTV-proportion movie recording at 24 frames per second

    The K-x provides a movie recording function* which captures beautiful, true-to-life movie clips in 16:9 high-definition TV proportions (1280 x 720 pixels) at a frame rate of 24 frames per second. This extends the benefits of high-quality SLR photography to the world of movie shooting: For example, reduce the depth of field to make a subject stand out, or use different interchangeable lenses to create distinctive visual effects.

    * When the PENTAX K-x's AV output terminal is used, movie clips are output at normal resolution. The data must be transferred to a PC for the playback of movie clips at high-definition TV proportions (1280 x 720 pixels).

  5. PENTAX-original SR mechanism for sharp, blur-free images

    The K-x features the PENTAX-developed SR (Shake Reduction) mechanism, which effectively compensates the adverse effect of camera shake by as much as approximately four shutter steps. This innovative mechanism extends its benefits to almost all PENTAX interchangeable lenses — even those designed for film-format cameras.** Thanks to this mechanism, the K-x produces sharp, blur-free images even under demanding conditions prone to camera shake, such as when using a telephoto lens, shooting in the dark without a flash illumination, and taking pictures of sunset scenes.

    ** Lenses compatible with this mechanism: PENTAX K-, KA-, KAF-, KAF2- and KAF3-mount lenses; screw-mounted lenses (with an adapter); and 645- and 67-system lenses (with an adapter). Some functions may not be available with certain lenses.

  6. High-speed continuous shooting at approximately 4.7 images per second

    The K-x’s high-speed continuous shooting mode records as many as 17 images (in JPEG recording format) at a maximum speed of approximately 4.7 images per second — the fastest of all entry-class models. The K-x also features a new, reliable shutter unit, which proved its dependability and ruggedness through a demanding action test of more than 100,000 shutter releases. Its top shutter speed of 1/6000 second allows the photographer to preserve sharp, crisp images of fast-moving subjects.
  7. Innovative image processing functions to produce distinctive photographic expressions

    1. Digital filter function
      The K-x’s digital filter function allows the user to process recorded images in a variety of creative ways within the camera and produce highly creative visual expressions. With a choice of 16 different filters, the user can even apply different filters one after another to a single image to create more personalized visual effects.
    2. Cross process mode
      The K-x features the new cross process mode, in which the camera automatically and randomly shifts photographic parameters for each exposure to create eye-catching images with unique, fanciful colors — just like pictures treated with the cross process*** in film photography. This playful mode adds the elements of surprise and unpredictability to digital photography, since the photographer cannot expect the outcome until the captured image is actually displayed on the camera’s LCD monitor

    *** A film development technique that takes advantage of unconventional film developers to create a distinctive finishing touch with intriguing colors.

  8. High-precision 11-point AF sensor

    The K-x’s high-precision, wide-frame SAFOX VIII autofocus system features 11 sensor points (with nine cross-type sensors positioned in the middle) to automatically capture even off-centered subjects in sharp, crisp focus. The photographer can also select one of the sensors as a focusing point to accommodate specialized applications.
  9. Other features

    1. Energy efficient circuit design for longer battery life, capable of capturing approximately 1,900 images with four AA-size lithium batteries
    2. Custom Image function to create unique finishing touches
    3. DR (Dust Removal) mechanism to eliminate annoying dust spots on recorded images and visually check for the adhesion of dust to the image sensor
    4. 2.7-inch, high-resolution color LCD monitor with approximately 230,000 dots
    5. Auto Picture mode for effortless, automatic selection of the most appropriate shooting mode, even during Live View shooting
    6. HDR (high dynamic range) function to create one composite image with an extra-wide dynamic range from three images with different exposures
    7. White balance control, featuring a new CTE mode to emphasize the color components of sunset scenes
    8. Status screen for easy, at-a-glance confirmation of various settings on the LCD monitor
    9. Ten scene modes, with selection via simple icons
    10. Automatic compensation of distortion and lateral chromatic aberration (available only with DA and D FA series lenses)
    11. PENTAX Digital Camera Utility 4 software package, with RAW-data processing and browser applications

Major Features of the smc PENTAX-DA L 55-300mmF4-5.8ED lens

  1. A lightweight super-telephoto zoom lens for focal lengths between 84.5mm and 460mm (in the 35mm format)
  2. ED (Extra-low Dispersion) glass optical elements to assure true-to-life image descriptions and faithful color renditions through effective compensation of chromatic aberrations over the entire zoom range.
Type TTL autofocus, auto-exposure digital SLR digital-still camera with built-in retractable P-TTL auto pop-up flash
Effective Pixels approx. 12.4 megapixels
Image Sensor Total pixels approx. 12.9 megapixels
Type CMOS with a primary color filter
Size 23.6mm x 15.8mm
Recorded Pixels Still Picture JPEG: [12M] 4288x2848 pixels, [10M] 3936x2624 pixels, [6M] 3072x2048 pixels, [2M] 1728x1152 pixels
RAW: [12M] 4288x2848 pixels
Movie [0.9M] 1280x720, 16:9, [0.3M] 640x416, 3:2
Sensitivity ( Standard output 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
Recording Format Still Picture RAW (Original/DNG), JPEG (Conforms to Exif 2.21), Conforms to DCF (Design rule of Camera File system) 2.0
Movie Motion JPEG (AVI) 24FPS
Image Formats JPEG - Baseline (starstarstar: Best, starstar: Better, star: Good)
RAW (12bit) (PEF, DNG )
RAW+JPEG: available
Storage Media SD memory card , SDHC memory card
White Balance Auto, Daylight, Shade, Cloudy, Tungsten Light, Fluorescent Light (W, D, N, L (Light Bulb) ), Flash, CTE, Manual setting, with WB fine adjustment
Viewfinder Type Fixed molded penta-mirror type
Focusing screen Natural-Bright-Matte II focusing screen
Field of view approx. 96%
Magnification approx. 0.85X (with 50mm F1.4 lens, infinity, -1m-1)
Diopter adjustment approx. -2.5 - +1.5m-1
Live View Type TTL by Image sensor
Display Enlargement (2X, 4X, 6X in case of AF mode, 2X, 4X, 6X, 8X, 10X in case of MF mode), Grid pattern, white/black out warning display, Histogram display
Autofocus Mode Contrast detection + Face detection / Contrast detection / Phase difference detection
Monitor Type TFT color LCD monitor, Brightness adjustable, Wide angle view
Size 2.7 inch
Dots approx. 230,000 dots
Preview Method Optical/Digital preview *This function can be allocated to green button through Menu.
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
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
Focusing System Type TTL phase difference detection, 11-point wide autofocus system (SAFOX VIII)
Focus Mode 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 selectable
Focus Point 5-point auto, 11-point auto, AF point select, Center
AF assist lamp avaiable (by Built-in Flash)
Exposure Control Metering System TTL open-aperture 16-segment metering (coupled with lens and AF information)
Metering Mode (1) Multi-segment metering (2) Center-weighted metering (3) Spot metering
Exposure Range EV1-21.5 (Standard Output Sensitivity 200 50mmF1.4)
Modes (1) Auto Picture mode (2) Picture mode (3) Scene mode (4) Program AE (5) Sensitivity-Priority AE (6) Shutter-Priority AE (7) Aperture-Priority AE (8) Metered Manual (9) Bulb
Picture mode: Portrait, Landscape, Macro, Action, Night scene portrait, Standard Flash-Off
Scene mode: Night Scene, Surf & Snow, Food, Sunset, Kids, Pet, Candlelight, Museum, Stage lighting*, Night snap* *The image is fixed to only JPEG.
Exposure 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)
AE Lock This function can be allocated to AF button in Menu.
Shutter Shutter Type Electronically controlled vertical-run focal plane shutter
Shutter Speed Auto: 1/6000 - 30 sec. and bulb, Manual: 1/6000 - 30 sec., and bulb
Drive Modes Continuous shooting Single-frame , Continuous (Hi, Lo), Self-timer (12s, 2s), Remote control (0s, 3s), Auto bracket
approx. 4.7 fps, sequence: 17 frame (JPEG and Continuous (Hi)) 5 frame (RAW)
approx. 2 fps , sequence: until the memory card becomes full (JPEG and Continuous (Lo)) 11 frame (RAW)
Built-in flash 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)
Flash Exposure
-2 EV - +1EV (1/2EV steps)
Flash Synchronization Hot shoe, sync-speed: 1/180 sec., P-TTL, high-speed-sync, wireless-sync with PENTAX dedicated flash
Image Stabilizer Type Image sensor shift mechanism, Max 4 steps
Dust Removal Type Image sensor moving mechanism and SP Coating
Time World Time 75 cities (28 time zones)
Data Folder Folder Name Date (100_MMDD•••), PENTX (100PENTX, 101PENTX•••)
Power Sources Four AA (lithium, alkaline, and rechargeable Ni-MH) batteries
Optional AC adapter also available.
Battery Life 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
Interfaces USB/Video
Video Output Compatible with NTSC and PAL formats
Lens Mount PENTAX KAF2 bayonet mount
Usable Lens 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.

Dimensions approx. 122.5(W) x 91.5(H) x 67.5(D)mm (4.8 x 3.6 x 2.7 inches)
Weight approx. 515g (18.2 oz.) without battery and SD memory card
approx. 580g (20.5 oz.) loaded and ready with lithium battery and SD memory card
approx. 615g (21.7 oz.) loaded and ready with alkaline battery and SD memory card
Included accessories USB cable I-USB7 , Strap O-ST53 , AA lithium battey 4pcs. , CD-ROM S-SW99
Eyecup FQ , Hot shoe cover FK, Body mount cover
Bundle software PENTAX Digital Camera Utility 4.0

*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.

[ Storage capacity ]

Still   128MB 256MB 512MB 1GB 2GB 4GB 6GB 8GB 12GB 16GB 32GB
RAW 4288 × 2848 PEF 6 12 24 48 98 194 295 394 595 794 1593
RAW 4288 × 2848 DNG 6 12 24 48 98 192 293 392 591 789 1583
4288 × 2848
starstarstar 17 35 69 138 281 553 841 1126 1699 2266 4547
starstar 31 61 122 244 495 973 1479 1980 2987 3985 7994
star 61 120 239 479 975 1915 2912 3898 5880 7844 15735
3936 × 2624
starstarstar 21 41 81 163 332 652 991 1327 2002 2671 5358
starstar 37 72 144 289 585 1149 1747 2339 3528 4706 9441
star 73 142 282 564 1138 2234 3398 4548 6860 9151 18358
3072 × 2048
starstarstar 34 67 133 267 543 1068 1623 2173 3278 4373 8772
starstar 60 118 234 468 945 1856 2823 3778 5699 7602 15251
star 116 227 450 902 1807 3549 5397 7224 10896 14535 29157
1728 × 1152
starstarstar 104 203 402 805 1617 3176 4829 6463 9749 13005 26088
starstar 177 346 686 1373 2793 5485 8341 11164 16840 22463 45061
star 325 634 1258 2518 5121 10057 15292 20468 30873 41182 82612

Movie   128MB 256MB 512MB 1GB 2GB 4GB 6GB 8GB 12GB 16GB 32GB
(1280 × 720,
starstarstar 00:00'22" 00:00'44" 00:01'28" 00:02'56" 00:05'49" 00:11'45" 00:17'53" 00:23'56" 00:36'06" 00:48'10" 01:36'37"
starstar 00:00'32" 00:01'02" 00:02'04" 00:04'08" 00:08'23" 00:16'29" 00:25'04" 00:33'33" 00:50'36" 01:07'30" 02:15'25"
star 00:00'45" 00:01'28" 00:02'54" 00:05'49" 00:11'46" 00:23'07" 00:35'09" 00:47'03" 01:10'58" 01:34'40" 03:09'54"
(640 × 416,
starstarstar 00:01'16" 00:02'29" 00:04'56" 00:09'52" 00:20'05" 00:39'26" 00:59'58" 01:20'16" 02:01'04" 02:41'30" 05:23'58"
starstar 00:01'47" 00:03'28" 00:06'53" 00:13'47" 00:27'41" 00:54'21" 01:22'39" 01:50'38" 02:46'52" 03:42'36" 07:26'33"
star 00:02'27" 00:04'47" 00:09'29" 00:19'00" 00:37'56" 01:14'29" 01:53'16" 02:31'36" 03:48'41" 05:05'03" 10:11'56"

The maximum file size is 4GB for movie.
The maximum length is 25 minutes for movie.

  • PENTAX,K-x and smc PENTAX are trademarks of HOYA CORPORATION.
  • PENTAX Digital Camera Utility and SDM are trademarks of HOYA CORPORATION..
  • All other brands or product names are trademarks or registered trademarks of their respective companies
  • Designs and specifications are subjects to change without notice
smc PENTAX-DA L 55-300mmF4-5.8ED Specifications
Focal Length 55-300mm (Equivalent to 84.5-460mm in 35mm format)
Aperture F4-5.8
Minimum Aperture F22-32
Lens Construction 12 elements in 8 groups
Angle of View 29 - 5.4° (wiith PENTAX D-SLR camera body)
Minimum Focusing Distance 1.4m (4.6 ft.)
Maximum Magnification 0.28x
Filter Diameter 58mm
Diaphragm control Fully Automatic
Number of Diaphragm Blades 6
Lens hood PH-RBG58mm (Optional)
Lens cap O-LC58
Lens case S80-160 (Optional)
Maximum Diameter & Minimum Length 71mm x 111.5mm (2.8 inch x 4.4 inch)
Weight approx. 425 g (15.0 oz.)
Remarks SP (Super Protect) Coating
  • PENTAX and smc PENTAX are trademarks of HOYA CORPORATION.
  • Design and Specifications is subject to change without notice.
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