Summary: The Pentax K-5 is an excellent reflex destined for those who want an advanced model able to guarantee maximum flexibility and quality images. The strength in the body allows you to take it virtually anywhere. Particularly interesting is the fact that it is equipped with a large number of seals that allow it to also be used in dusty environments, with sand or under a light rain.
Pros: Quality of results, Creative features.
Cons: In the second video does not work autofocus.
Excerpt: Pentax has a long history of innovation as well as a rabid fan base that loves the company’s tradition of optical excellence and originality. In fact, this fan base is the reason I’m writing this review. If you’re not already a Pentaxian you probably didn’t know that Pentax (derived from PENTAprism refleX) built the first camera to incorporate a penta-prism viewfinder and reflex mirror system in 1957 and went on to introduce the first TTL metering system in 1964.
Summary: The Pentax K-5's compact, solid body, generally well thought-out ergonomics, comprehensive feature set, and excellent image quality, in both still and movie modes make it one of the best APS-C DSLRs currently on the market.
Pros: Good detail and dynamic range (even better in RAW), Exceptionally low shadow noise in RAW files at low ISOs, One of the best APS-C DSLRs in terms of high ISO image quality, Very good build quality and handling, Maximum ISO of 51,200 at full resolution, Excellent burst depth in RAW mode (with firmware 1.0.1), 1080p HD video mode with basic editing built-in, Useful electronic level and composition adjustment functions, Comprehensive customization options including adjus...
Cons: AF system not as versatile as Nikon D7000 (which is a cheaper camera), Lockable exposure mode dial can be annoying, No dedicated movie shooting button, No AF during movie shooting, Poorly implemented live histogram in live view/manual exposure mode (doesn't show final exposure), No 'live' aperture control during movie shooting, Shadow Correction mode doesn't take full advantage of K-5's sensor, Jaggies can be a problem along very fine diagonal lines
Conclusion: The weather-sealed Pentax K-5 is a fast-shooting digital SLR with in-body stabilization and fast burst shooting, but it's hampered by an underperforming kit lens, poor high ISO performance, and some other issues.
Summary: The K-5 has set many firsts for Pentax, and has already gotten the Pentax brand mentioned alongside the industry-leaders, Nikon and Canon, all over the web. It is a fantastic DSLR with exceptional image quality, fast autofocus, high sensitivity, a compact and lightweight design, weather-sealing, and shake reduction backwards-compatible with old lenses even from the screw-mount era.
Pros: Superb image quality, Excellent for low-light photography (ISO 80-51,200), Weather sealed, Easy-to-use interface with many buttons, Good overall performance, Compatible with thousands of lenses, Very reasonably priced, AF system improved over the K-7
Cons: Records video in .AVI format, Poor selection of video framerates, AF is not as good as that of the competition, Too small for some hands without battery grip
Summary: If you’re a Pentax owner looking to step up, the K-5 is a worthy upgrade from the K-7 or any other Pentax DSLR. You’ll get a noticeable amount of added resolving power, at least an extra stop of usable ISO, and if you don’t mind noise, sensitivity up to ISO 51,200. Plus, the burst rate has been ratcheted up, to 7 fps over the K-7’s 5.2 fps.
Excerpt: FROM OUR EDITORS AT PHOTOKINA: Housed in the same the exact water-resistant, cold-sealed body, the all-new Pentax K-5 is more of an upgrade to Pentax’s flagship prosumer camera, the K-7, than a new camera all together—but despite the lack of noticeable changes on the outside, it is what's on the inside of the K-5 that counts.
Summary: The Pentax K-5 is an upgraded K-7 which slips past it as the most feature-rich digital SLR made to date, adding a second axis to the digital-level and featuring a more advanced image sensor. Its 16 megapixels sensor provides an ISO sensitivity range of 80 to 51200, 7 FPS continuous shooting and 1080p HD video.
Pros: Excellent control over image noise, Great retention of details, Superb dynamic-range, Accurate image colors, with correct white-balance set, Very good metering in Live-View, Very good focusing accuracy, Generally fast and responsive, Effective stabilization for all lenses, Automatic horizon correction greatly helps, Innovative exposure modes & program line, Extremely flexible image parameters, Customizable Auto ISO and NR, Digital white balance preview, Post-shot RAW ...
Cons: Automatic white-balance not so reliable, Noticeable image review delay, Useless ISO 51200, Live-view not exposure-priority and useless histogram, Difference between viewfinder and Live-View metering, Occasional over-exposure using viewfinder, Slow in-camera corrections, Reduced buffer-depth at high ISO, LCD flush with left side, Status screen does not turn off automatically, Pitch not visible in viewfinder, RAW button too sensitive, Camera strap gets in way of mode-dial