2011年1月3日星期一

Pentax K-5

  

Pentax K-5 In-depth Review

December 2010 | Barnaby Britton and Lars Rehm


Review based on a production Pentax K-5 with firmware 1.0.1
In terms of operation and design the new K5 is all but identical to the K-7. For this reason, to gain a '360' view of the K-5's body design and operation we therefore recommend you not only read this review, but also the relevant sections in our full review of the Pentax K-7.
When the K10D was launched in September 2006 it was Pentax's first foray into the 'enthusiast' DSLR market, competing at the time with rivals such as the Canon EOS 30D and the Nikon D200. Four years later in 2010 the enthusiast sector of the market is as competitive as ever and the K-5, Pentax' latest offering to the 'serious amateur photographer', will have to fight for consumers' attention with the likes of the Canon 7D, Nikon D7000 and D300S, and the Olympus E-5. At a launch RRP of $1600 (body only) the K-5 is currently at a similar price point as its main competitors but we would expect the street price to go down sooner rather than later.
At first sight the K-5 is virtually indistinguishable from the K-7 (in some markets the K-7 will remain in the Pentax line alongside the K-5). Apart from an additional 'Fx' (which stands for 'flex') label on the customizable RAW button and a subtle redesign of the AF switch on its rear there are no readily significant differences between the K-5 and its predecessor the K-7. However, there is more novelty to be found under the hood - the K-5's most notable new component is a 16.3 megapixel CMOS sensor, which is probably closely related to the sensors inside the Nikon D7000 and Sony SLT-A55. The new sensor brings with it a higher maximum sensitivity (ISO 51200 in expanded mode, the highest on any APS-C camera to date), faster continuous shooting (7.0 fps vs the K-7's 5.2fps) and a 1080p full HD video mode (the K-7 offered a rather non-standard 1536 x 1024 pixels maximum video resolution).
Other improvements include an upgraded SAFOX IX+ AF system, inherited from the recently unveiled medium-format 645D, which features color-detection, wider coverage of the AF points and improved speed. Also new is a dual-axis electronic horizon (now with pitch as well as roll indication) and a few extra digital filters and custom image modes. Despite the changes, however, existing K-7 users will no doubt require very little adjustment time if they decide to upgrade to the new model.
The K-5 has exactly the same dimensions as its predecessor, the K-7. Its magnesium alloy and stainless steel body is chunkier than Pentax's new upper entry-level DSLR the K-r (pictured here on the left) but still relatively compact for a camera in its class.


Key Features

Although it might appear to be a near-clone of the K-7, the K-5 offers some significant improvements in specification. Here is a rundown of the key features:
  • 16.3Mp CMOS sensor
  • ISO sensitivity span of 80-51,200 (equivalent)
  • 1080p HD movie mode
  • Limited in-camera movie editing functionality
  • Socket for external microphone input
  • Triple-axis sensor-based shake reduction (horizontal, vertical and rotational correction)
  • New SAFOX IX+ 11-point AF system (improved over the K-7)
  • Support for older Pentax lenses with manual aperture rings
  • Magnesium alloy body shell
  • Improved handheld HDR function (JPEG mode only)
  • Continuous shooting up to 7fps
  • 100% viewfinder coverage (0.92x magnification)
  • Choice of PEF or DNG RAW files
  • 3in, 921k pixel LCD screen 

Model line history

Model
Announced
Effective pixels
Continuous shooting
Movie modeLCD monitor
K10DSep 200610.2 mp3.0 fpsn/a2.5" 210K pixels
K20DJan 200814.6 mp3.0 fpsn/a2.7" 230K pixels
K-7May 200914.6 mp5.2 fps1536 x 1024 30fps3.0" 920K pixels + Live View
K-5Sep 201016.3 mp7.0 fps1080p 25fps3.0" 921K pixels + Live View

Pentax K-5 compared to K-7 and K-r

The table below shows the specification differences between the K-5's predecessor, the K-7, and the recently released K-r. Apart from the new sensor, the differences between the K-5 and the older K-7 are quite subtle. It is clear that Pentax has opted for selective improvements rather than a complete overhaul. 
 

K-7

K-5

K-r
Image sensor
14.6Mp CMOS
16.3Mp CMOS12.4Mp CMOS
Imaging engine
Prime II
Prime IIPrime II
Sensitivity
100-3200 (6400 with expansion)
100-12800 (51200 with expansion)200-12800 (100 and 25600 with expansion)
Continuous shooting speed
5.2 fps (40 frames)
7.0 fps (40 frames)6.0 fps (25 frames)
AF
SAFOX VIII+
11-points (selectable)
SAFOX IX+
11-points (selectable)
SAFOX IX
11-points (selectable)
AE
77-segment
77-segment16-segment
Viewfinder
Pentaprism
Coverage: 100%
Magnification: 0.92x
Pentaprism
Coverage: 100%
Magnification: 0.92x
Pentamirror
Coverage: 96%
Magnification: 0.85x
LCD screen3.0 in, 920k pixels3.0 in, 921k pixels3.0 in, 921k pixels
Movies
1536 x 1024 30fps
1080p 25 fps720p 24fps
Microphone
Mono internal or stereo external
Mono internal or stereo externalMono internal
HDMI output
Yes
YesNo
IR simpleNoNoYes
Cross process modeNoYesYes
Night Scene HDRNoYesYes
Movie custom images modesNoYesYes
BatteryRechargeable Lithium Ion batteryRechargeable Lithium Ion batteryRechargeable battery or four AA batteries (with adapter)
Cold resistant to -10deg
Yes
YesNo
Weather resistant
Yes
YesNo
Weight (body only)
670g
670g544g

Foreword / notes

If you're new to digital photography you may wish to read some of our Digital Photography Glossary before diving into this article (it may help you understand some of the terms used).
Conclusion / recommendation / ratings are based on the opinion of the author, we recommend that you read the entire review before making any decision. Images which can be viewed at a larger size have a small magnifying glass icon in the bottom right corner of them, click to display a larger image in a new window.
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This article is protected by Copyright and may not be reproduced in part or as a whole in any electronic or printed medium without prior permission from the author.
Dpreview use calibrated monitors at the PC normal gamma 2.2, this means that on our monitors we can make out the difference between all of the grayscale blocks below. We recommend to make the most of this review you should be able to see the difference (at least) between X,Y and Z and ideally also A, B and C.

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