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Pentax K-7 Digital SLR Review

Matt Grayson saw the new Pentax K-7 DSLR. But is it any better than the K20D?

|  Pentax K-7 in Digital SLRs
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The Pentax K-7 has been speculated about for a number of weeks thanks to leaked information and spy style blurry photographs on rumour sites.

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Pentax K-7: Specification
  • Pentax K7 DSLRResolution: 14.6Mp
  • Sensor size: 23.4x15.6mm
  • Sensor type: CMOS
  • Image size: 4672x3104
  • Focus system: TTL phase detection
  • Focus points: 11
  • Crop factor: 1.5x
  • Lens mount: Pentax KAF2 bayonet
  • File type: RAW, JPEG
  • Sensitivity: ISO 100-6400
  • Storage: SD, SDHC
  • Focus types: Auto single, continuous, manual, point select
  • Metering system: TTL open aperture 77 segment metering
  • Metering types: Multi, centre-weighted, spot
  • Exposure compensation: +/- 5EV
  • Shutter speed: 30sec-1/8000sec & bulb
  • Frames per second: 5.2fps
  • Flash: Built-in (Guide no. 13), external
  • Flash metering: P-TTL
  • Flash sync speed: 1/180sec
  • Image stabilisation: Image sensor shift mechanism (Shake Reduction) max. 4 stops
  • Integrated cleaning: Image sensor cleaning function by supersonic vibration
  • Live view: Yes
  • Viewfinder: Pentaprism type (100% field of view)
  • Monitor: 3in TFT LCD, AR coated (921,000dot)
  • Interface: USB 2.0
  • Power: Li-Ion battery
  • Size: 130.5x96.5x72.5mm
  • Weight: 670g (excl. battery and card)

Pentax K7 DSLRPentax K-7: Features
As a mid-range DSLR, the K-7 sits comfortably above the K20D and shares the same resolution on the sensor meaning that either Pentax have found their limit in terms of resolution or that they're going to launch another model soon with a higher number of pixels.

This is the first venture into what Pentax call the prosumer market. This is a bit of a surprise as it's commonly thought the K20D was at least prosumer but apparently not. "This is somewhere that Pentax haven't been before and we're really excited" said Johnathan Martin, Pentax National Sales Manager.

Capping the resolution at 14.6Mp wouldn't be a bad thing as it would demonstrate evidence of the pixel race beginning to slow. Given that Pentax told ePHOTOzine that they don't think pixels are the be all and end all, would it be foolish to keep pushing them up? Or is it strictly good business sense?

Pentax are clear to point out that the sensor used on the new K-7 isn't the same as the one used on the K20D sporting a “high-speed, four channel image data read-out” compared to the K20D's two. They're confident that the camera will give impressive results and only time will tell when we get a final production model. Coupled to the sensor is a PRIME II processor which is a newly developed upgrade to the original PRIME (Pentax Real Imaging Engine).
Pentax K7
On the back is a nice large screen which boasts a higher resolution.
Pentax K7
The dial on top has a centre locking button which needs to be pressed to change the mode.
Pentax K7
The top plate features an LCD screen, exposure compensation and dedicated ISO button.
For the more creative users, the K-7 features the filter settings found on the K-m but also has a new “muted” mode which essentially drops the saturation of the image which looks good on gothic type images. The option to adjust the saturation, contrast, tone and sharpness has always been available but now that's been expanded with high/low key and highlight/shadow contrast adjustment settings.

No DSLR is worth its salt these days if it doesn't have a video mode and the K-7 is no different. It records at 1280x720 30fps which is the bare minimum to be classed as HD quality but not full HD. This could still be useful with the YouTube generation or wedding/event photographers that want to give that bit extra.

Other new features include a HDR function which takes three images of different exposure and composites them to give one image with the widest dynamic range possible. Previously seen on compacts, the K-7 also has the dynamic range cushioning system that prevents over exposed areas from burning out and under exposed areas from going completely black. Similar to Nikon's distortion correction, when you have a Da and Dfa lens attached, you can use automatic compensation for distortion and lateral chromatic aberration.

There's also spirit level which is nothing new, a multiple exposure seen on the K20D and composition adjustment. This is for fine tuning carefully composed images on a tripod and need just a millimetre of movement here or there. The frame can be moved around by using the shake reduction feature to physically move the sensor. This mode and the electric level adjustment are exclusive to Pentax because of the way the Shake Reduction is designed.

Pentax told ePHOTOzine that because it doesn't use rails, the sensor is more manouverable and if the camera detects a slight inclination on the horizon, the camera will automatically correct it for you by moving the sensor to level it out. Of course this is open to imperfections such as perspective and purposefully angled lines but it can be switched off on page three of the camera options in the menu.

Pentax K-7: Build and handling
After the 77 metering segments, a clue to the idea behind the camera's designation appears with the 77 seals to keep moisture and dust proof. It's also cold resistant to -10 which it manages by incorporating a mixture of materials in the skeleton. The K-7 uses a stainless steel frame on a magnesium steel alloy body.

The shutter is newly developed for the K-7 boasting a top speed of 1/8000sec which is pretty good for a camera aimed at this market and it's been tested to 100,000 cycles.

This is easily the best designed camera of all the DSLRs so far. Pentax have gone back to the blocky squareness of old film SLRs that made them popular and it's a pleasure to hold. As I used the pre-production model in London, I felt confident holding it in one hand if it was necessary. However, it's marginally smaller than the K20D and 33% smaller than the Nikon D300. It's also 22% lighter than the Nikon D300 and 9% lighter than the Canon EOS 50D.

Pentax K7Pentax K-7: Focus and metering
The multi-segment metering has been upgraded immensely from 16 segments to 77 on the new model. Theoretically this ensures more accurate exposures due to the higher amount of portions that are taking a reading. The camera also compensates for the composition, format (landscape or portrait) and distance of the subject by using sensors located in the camera body.

Live-view on the K20D was great when the camera was released because it was a relatively new concept on DSLRs at the time but now it looks slow and clunky. The K-7 has had a revamp in the live-view area and now has face recognition and a faster AF system which could be a godsend to current Pentax DSLR live-view users. Out of face recognition, the K-7 uses contrast detection AF and the image stays on the screen when it focuses too.

You can also feel confident using the viewfinder as Pentax have opted for a 100% view using the traditional method. They've also added a petaprism instead of a pentamirror which gives 0.92x magnification.

Pentax K-7: Performance
It's good to see that Pentax have managed to improve on the dire focusing system of the K20D, especially in live view which has now got three types of focusing. It also feels more like a traditional Pentax and I like to think that with the more squared off design, they may be going back to their roots again. It hasn't done Olympus any harm and with the backwards compatibility of the Pentax lenses, they've kept hold of long term owners who might otherwise have chose a different system.

Please be aware that the image of St. Paul's Cathedral was taken on the K-7 with pre-finalised firmware. Pentax Japan have also confirmed that the version of the K-7 that we have here at ePHOTOzine will differ from the version that will be in the shops. They've decided to make minor modifications to the sensor which could result in differences to what you see here.

ePHOTOzine will get hold of a final product for comparison when they're released in early July.

Pentax K7
I like the bold primary blue on the colour test chart but I think the other colours are paler by comparison. Earth brown and forest green aren't as boosted as they usually are on other cameras including Pentax models such as the Pentax K-m. The mono tones look ok and I like the skin tone tile but I think more colour could be put into the pastel tiles down the left side of brown, orange and blue.

It was a really bright day on the test for the portraits and the camera struggled with metering in direct sunlight so we went into some shade and I set the white balance to the correct setting. The image still looks very warm though, as though the subject is on holiday as opposed to at the office. It looks nice but is it really appropriate for every type of portrait in the sun?

Adding flash has removed a lot of the warmth and has balanced out the skin tone. Small catchlights are seen in the eyes and their's plenty of detail in the hair.
Pentax K7
I like the portrait result although I think it's a little under exposed.
Pentax K7
Adding flash has sorted that problem out though.
I retook the detail image of the Agfa Billy vintage camera and I feel that I got a better image this time round which could be down to the finalised firmware. I didn't think I'd see a difference in the finalised images at all but I think they're sharper than before.
Pentax K7
This detail shot can be compared with the RAW version.
Pentax K7
The built-in HDR feature takes three separate images at varying exposure and pastes them together.
One of the most interesting features is the built-in HDR which comes in two varying strengths. This shot of St. Pauls cathedral shows the results quite well and if you prefer the distorted HDR effect over the natural effect found in Adobe Photoshop CS4 then this will be right up your alley. It takes three photographs of varying exposure to get the highlights and shadow detail then merges them in camera.

It works faster than doing it manually which is good for slow moving objects such as clouds that may give a ghosting effect if left too long. However, it still needs a tripod and fast moving objects will still not align properly.Pentax K7

I love the results from the landscape image mainly because it was a lovely day and I was outside but I also like the two butterflies playing. Metering has struggled with the harsh shadows but it's to be expected which is a shame because on days like this I like to underexpose slightly to deepen the sky. More detail would've been lost if I'd done that and on reflection I think the colours are pretty good anyway.

Pentax K-7: Noise test
I'm liking the noise results from the Pentax K-7, not only because they're among the best I've seen from a Pentax model but also because the control that the new processor is commanding over the noise is excellent. The best noise control I've seen so far from a Pentax DSLR is on the K-m, which has 4Mp less, and although noise appears relatively early on, it doesn't even get aggressive at the higher settings which is nice to see.

ISO400 to ISO1600 look roughly on par with each other which is good news for low light shooters who dislike flash.

Pentax K-7 ISO100 RAW image (pending)
Pentax K-7 ISO6400 RAW image (pending)
Pentax K7
The ISO100 test.
Pentax K7
The ISO200 test.
Pentax K7
The ISO400 test.
Pentax K7
The ISO800 test.
Pentax K7
The ISO1600 test.
Pentax K7
The ISO3200 test.
Pentax K7
The ISO6400 test.
DxOMark provides objective, independent, RAW-based image quality performance data for lenses and digital cameras to help you select the best equipment to meet your photographic needs.

Visit the DxOMark website for tests performed on the Pentax K-7.

Pentax K-7: Verdict
I'm so impressed with the K-7 that I think this is one of the most exciting cameras released this year. I think this could rival the Olympus E-620 for the title, which I'm tipping as one of the best DSLRs ever made. It certainly improves on the K20D but then as a higher class this should be a no-brainer.

Of course, as always, I'm not entirely satisfied and I think there's room for improvement in the video area thanks to the release of the new Panasonic DMC-GH1 showing everyone how it's done. The buttons aren't overly responsive but this could be down to the pre-production model so I don't want to put too much emphasis on it.

Established Pentax users will be extremely happy with the new features and picture quality along with the continued backwards compatibility of older Pentax lenses. New comers to the Pentax brand will see new technology that hasn't been seen on any other camera yet as well as proven features that users want and need.

Well done Pentax.

Pentax K-7: Plus points
Faster focusing
Improved live view
Faster frame rate
Good build
Good noise performance
Built-in HDR shooting
PC sync socket

Pentax K-7: Minus points
Portrait underexposed slightly
Colours aren't the best I've seen
No full HD video





I've awarded the Pentax K-7 with the Cutting Edge design for the built-in HDR feature and the Highly recommended simply because it's a good camera.

The Pentax K-7 costs £1199.99 with the new 18-55mm f/3.5-5.6 AL WR lens and is available from Warehouse Express here:

Pentax K-7 & 18-55mm f/3.5-5.6 AL WR

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Photographs taken using the Pentax K-7

Lovers IISmall Tortoiseshell on a Pansy ...LoversOne Amazing Lily From My Neighbor's Garden.Comma on a Blackberry ...Horse 125Red Admiral Nectaring ....What's your Thing?The Sadness Of EverythingI love streaming.  :))Silver Y Moth ....Midnight BlueSmall Tortoiseshell Basking and Nectaring ....Horse 105Everybody Comes to Rick's

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AnthonyM 16 428 2 United States
22 May 2009 10:44AM
Nice that they finally broke the 3fps barrier, but the specs overall certainly do not wow me.
I was hoping to have a reason to upgrade my K10D, but unless auto focus is vastly improved, I do not think this will be it. It saddens me that I may need to "upgrade" to another brand.
willbrealey 16 253
4 Jun 2009 5:16PM
Matt failed to mention that the camera has an EXTERNAL MIC JACK, which is an improvement on the Panasonic... video enthusiasts will tell you that audio quality is even more important than sound quality when recording, and Pentax have addressed this. And from what I have seen, video and sound quality are very good indeed.

Yes, I am a Pentax fan-boy, and perhaps my expectations have been lowered by previous Pentaxes (although never in image quality!) But I honestly can't see what features this camera is lacking, for what will be a street price of 800 or so after prices settle. But more in-depth reviews than this one will tell. 5fps, weather sealed, mag-alloy body, HD video with stereo mic input, compact 'traditional SLR' size, pentaprism viewfinder - where else can you get all this in a sub-1000 camera?
oneill 13 155 Ireland
4 Jun 2009 11:21PM
hello matt ,,did you get your review findings on a pre production k7/ or a final production model,,,, as if it is and you then get the full final .p/model, later on,,,,, you mite have to add more till your review,, or change your verdict ,,,,,,
gfmucci 11
5 Jun 2009 2:56AM
"and if you prefer the distorted HDR effect over the natural effect found in Adobe Photoshop CS4 then this will be right up your alley."

Is this a sarcastic slam, or does it mean something I'm not quite grasping? This statement needs more explanation.
BigK 15 8
5 Jun 2009 10:09AM
Strange - everyone else seems to only have Firmware V 0.35 and there was mention somewhere that Pentax have specifically asked for no Pics above ISO 1600 till Firmware V1.0.

Is your review based on V1.0 or not - I think that would be an important clarification.

raul_naja 15 3 United States
6 Jun 2009 3:46AM
As a dedicated Pentax Shooter 20+ years I skipped The K20D. Will be one of the first in line to get this new K7. With my ample Pentax lens line up this will be a welcome upgrade from my K10D which has served me well these two years. All things point to a nicely built pro level camera which should produce great images. On your Mark, get set Go!!!

phototime 15 8 United Kingdom
6 Jun 2009 10:05AM
Well said there Kevin,love my K10D but will upgrade to K7 soon looks great to me.

MattGrayson 14 622 3 England
8 Jun 2009 1:38PM

Quote:Hello matt ,,did you get your review findings on a pre production k7/ or a final production model,,,, as if it is and you then get the full final .p/model, later on,,,,, you mite have to add more till your review,, or change your verdict ,,,,,,

It's pre-production pat. I do mention as much as feasibly possible and, yes, the review will be updated to confirm final firmware tests. Smile
MattGrayson 14 622 3 England
8 Jun 2009 1:40PM

Quote:"and if you prefer the distorted HDR effect over the natural effect found in Adobe Photoshop CS4 then this will be right up your alley."

Is this a sarcastic slam, or does it mean something I'm not quite grasping? This statement needs more explanation.

No no no, not sarcasrtic at all. I like the "ethereal" (distorted) effect of HDR and I've used PSP X2 to get it, but I also use CS4 image stacking feature and it does the same thing but without the effect.
MattGrayson 14 622 3 England
8 Jun 2009 1:42PM

Quote:Strange - everyone else seems to only have Firmware V 0.35 and there was mention somewhere that Pentax have specifically asked for no Pics above ISO 1600 till Firmware V1.0.

Is your review based on V1.0 or not - I think that would be an important clarification.


I've heard this on the grapevine but I've had no set instructions about it. I'm going to take them down to be on the safe side but getting the camera was a last minute decision by Pentax at the launch and no embargo was put in place regarding ISO images. I believe many USA sites have had this restriction though.
oneill 13 155 Ireland
8 Jun 2009 3:10PM
that ok ,,matt, was just thinking had you got your hands on the final production model,,,hopefully the minus points will be addressed, by pentax,, also matt is the lcd,,ok outdoors,,,,,,pat
14 Jun 2009 10:09PM

Quote:The frame can be moved around to use the excess pixels (usually denoted in a specification list as total pixels) on the sensor.

Matt, this is very misleading towards readers and I hope you will modify accordingly. The sensor itself moves around to help you recompose, not the excess pixels.

As far as I know, the excess pixels are there to prevent the frame from darkening around the edges. I might be wrong here, but I'm 100% sure the K-7 shifts the sensor to recompose.
MattGrayson 14 622 3 England
15 Jun 2009 9:44PM
I heard about this recently but I've been out of the office to check it directly with Pentax.
I had (and still have) no instruction manual so I had to assume how it was done. I'll check it when I'm back in on Thursday and update it if need be. Smile
16 Jun 2009 12:56PM
Hi Matt great review seems like one heck of a camera,, i am deciding on this or the Canon 50D which would you think is the better one? also would the noise levels on the K7 be as good as the 50D? ThanksWink
MattGrayson 14 622 3 England
22 Jun 2009 9:08AM
There's not a lot in it, I think you'd best look at both reviews then consider things like which system you've already invested in, if neither, which would give you the results you need.
Ask for advice on the forums too, your questions will more likely to be answered than on the comments section here.
sunce 9
13 Sep 2011 2:58AM

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