Pentax K20D

The Pentax K20D were 14.6 megapixel digital single-lens reflex cameras manufactured by Pentax that were announced on January 23, 2008.

Pentax K20D

Type	digital single-lens reflex camera
Image sensor	CMOS active pixel sensor with a primary color filter
Maximum resolution	14.6 megapixels
Lens	Interchangeable Pentax K mount compatible with Pentax auto-aperture lenses; older lenses supported in stop-down metering mode.
Shutter speed range	1/4000 sec – 30 sec, Bulb
Exposure (photography) metering	through-the-lens [TTL] open-aperture metering with choice of: 16-segment, center-weighted & spot meter
Exposure modes	Program, Sensitivity Priority, Shutter-Speed Priority, Aperture Priority, Shutter-Speed and Aperture Priority, Manual, Bulb
Film speed	ISO Auto, 100, 200, 400, 800, 1600, 3200, boosted: 6400
Rear LCD monitor	2.7″, 230,000 pixels
Storage	Secure Digital card, Secure Digital card#SDHC
Battery	Rechargeable D-LI50 Lithium-ion battery, Optional AC adapter
Weight	715 g (25.2 oz) without battery, 790 g (28 oz) with battery
Made in	Philippines

The K20D and GX-20 bodies were developed by Pentax, while the CMOS sensor was manufactured by Samsung - a result of a partnership begun in 2005. Although both cameras share similar hardware, each camera has its own design, firmware, and image processing algorithms. The K20D is the first Pentax DSLR with a CMOS image sensor co-developed by Pentax and Samsung. Samsung's expertise in sensor design is seen as a major benefit to Pentax, when most other camera manufacturers had already established themselves in the growing digital SLR market.

At the time of their release, the K20D and GX-20 had the highest resolution sensor in the APS-C image sensor format at 14.6 megapixels. In 2009, Pentax announced the Pentax K-7, the successor the K20D with an improved CMOS sensor, smaller design, and many new features including HD video recording.

The latest firmware release, version 1.04, was made available in April 2010. It solved issues with certain SDHC memory cards. The previous firmware update, version 1.03, was made available in April 2009 and improved Shake Reduction (SR) accuracy as well as autofocus performance in some conditions. Users can download firmware updates from the Pentax website

Features

The K20D is the successor to the well-reviewed Pentax K10D prosumer DSLR. The K20D was released alongside the Pentax K200D, a substantial upgrade of the entry-level Pentax K100D. Relative to its predecessor, the K20D offers:

• a CMOS image sensor with:
  • higher resolution (14.6 megapixels vs. 10.2 megapixels for the K10D)
  • higher sensitivity, up to ISO 6400 equivalent (vs. ISO 1600 for the K10D)
• a slightly larger, higher-resolution, main LCD screen with live view] and which can be color-calibrated via custom settings
• a more versatile burst mode (photography)(continuous shooting mode), offering a choice between 3 frame/s at full resolution and 21 frame/s at 1.6 megapixel resolution.
• the option to take a series of bracketed shots with one shutter press.
• an improved autofocus and shake reduction system
• a new Dust Alert feature, which scans the sensor for dust particles and highlights their locations for ease of removal
• dynamic range enhancement by 1 exposure value (EV)
• ability to adjust the AF offset to solve front/back focus problems for up to 20 individual lenses
• an X-sync socket for studio flash control
• a new higher-quality (and less-compressed) “★★★★” setting for JPEG images
• selectable levels of in-camera noise reduction
• a separate option for levels of edge sharpening in JPEG images, addressing a frequent complaint in reviews of the K10D
• Portrait, Landscape, Vibrant, and Monochrome image tone settings in addition to Bright and Natural
• optional automatic fine adjustment of white balance even when the type of light source is manually selected
• Customizable filename prefixes, allowing one to easily distinguish between files from multiple K20Ds
• In-camera Defective pixel (hot-pixel) mapping
• A trap-focus feature which works with some autofocus lenses (the pentax DA and FA lenses that have an MF/AF switch on the lens - see p. 112 of the K20D manual).
• Interval shooting option allows up to 99 images to be captured at chosen intervals and at a chosen start time.

The firmware of the Samsung GX-20 is also different, using different menus and symbols. It also lacks support for the Pentax PEF raw image format. The JPEG image processing of the GX-20 is reportedly different from that of the K20D;.