Resolution and Image Quality

Our early impressions of the K20D were pretty positive with the fast Pentax 50mm f1.4. As always with recent screw-drive AF, the lens focusing is reasonably fast (if not blistering) and noise is much greater than the excellent Canon Ultrasonic motor lenses - which are now most of the better lenses in the Canon line. We had a K10D for comparison and the K20D seemed faster in AF, even though Pentax makes no claim of improvements in AF with the K20D.

The 14.6 MP CMOS sensor actually allows an ISO Boost to 6400, so the new ISO 3200 and ISO 6400 were the next features to tackle. By default the K20D high ISO noise reduction is set to off. This resulted in usable but grainy images at ISO 3200 and an ISO 6400 performance that was too coarse to be useful for our needs.

However, with the "weakest" and "weak" high ISO Noise Reduction settings, our first impressions in pixel-peeping high ISO images was much more favorable. The images with a small amount of noise reduction were pretty good - much better than we had expected. We had to wonder if early reviewers had noticed that high ISO noise reduction is completely off by default.

Images to ISO 1600 were quite good; 3200 shows deterioration in the shadow areas, but it is still very usable - even for large prints. ISO 6400 quality is better with a little NR and it would be usable for smaller prints or the web-posting we do, but too much is lost for large prints. All in all this is an outstanding performance for the new Samsung 14.6 MP sensor. Like many others, we wondered how good a new sensor from Samsung could be compared to Canon, Nikon, and Sony. More testing will be done in this area, but our first impressions are that the Samsung sensor is quite competitive, capturing more detail than the competing Nikon, Sony, Olympus, and Canon prosumer models.

Auto can be set to any ISO range you want, a feature Canon still refuses to implement fully. Based on early test shots we wouldn't hesitate to set the auto range from 100-1600 on a routine basis and 100-3200 if we were going into a low-light situation - or for times when the highest possible shutter speed is required. We would reserve 6400 for those special situations where the trade-offs make it worthwhile.

Whenever there is a recent Pentax is in our hands, we are again reminded of the usefulness of Hyperprogram, where you can instantly shift the aperture or shutter speed (front and rear dials) with the camera shifting other program parameters. Like the K10D, the K20D continues the unique TAv (Time & Aperture) Priority program, where you can select the shutter speed and the aperture which remain fixed while the program dynamically changes the ISO to maintain shutter speed and aperture. Selectable Auto ISO to 6400 on the one hand, and both TAv and Sv (Sensitivity or ISO) programs with the same range on the other hand, make the K20D a remarkably flexible digital SLR.

Index SDM Motor Lens
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  • dug777 - Tuesday, March 11, 2008 - link

    I think I understand what you're saying, like A & S (full Manual even) priority modes from Nikon, but within Program auto?
  • haplo602 - Tuesday, March 11, 2008 - link

    Hey finaly an SLR review on anandtech I can agree with.

    BUT you left out THE big feature of K20D - dynamic range manipulation. You can move the dynamic range in one or both directions on the K20D.

    f.e. the camera will shoot the shadows at 200iso while highlights are shot at 100iso ... like a real time HDR option.

    I saw comparison photos of this in a magazine and that was a WOW moment (unlike Windows Vista :-)). finaly one revolutionary feature and long needed in the DSLR technology.
  • Wesley Fink - Tuesday, March 11, 2008 - link

    We were also impressed with the dynamic range expansion options on the K20D, and we will be covering this in more detail in the full review. Most other manufacturers in prosumer space have similar capabilities under differnt names, but the flexibility of the Pentax variant will definitley be examined in the full review.
  • dash2k8 - Tuesday, March 11, 2008 - link

    It's always good to see companies push the technology envelope, because other brands will be forced to follow suit and in the end, the consumers benefit. From a practical point, however, this Pentax release would probably not be as big an industry splash as, say, a Canon 50D with 14.6 mpixels, given the market for each brand. But it sure paves the way for a brighter tech future for all photographers.
  • Heidfirst - Tuesday, March 11, 2008 - link

    oh & apart from the SDM part compare the specs. of it to the Tokina AT-X 165 PRO DX ... ;)
  • Wesley Fink - Tuesday, March 11, 2008 - link

    Tokina is the T in THK (Tokina Hoya Kenko) and has recently developed several lenses with Pentax. These Tokina lenses are offered in mounts other than Pentax so as not to compete with thier own brand. However, as you point out, SDM is not a feature of these Tokina lenses.
  • WalkingDead - Tuesday, March 11, 2008 - link

    The Pentax lens also has full weather seals.
  • Heidfirst - Tuesday, March 11, 2008 - link


    The lone exception is the announced Sony A350, which will sport a 14.2 MP CCD sensor.

    at least in my part of the world the A350 has been shipping for a week or so.


    Whenever a recent Pentax is in our hands, we are again reminded of the usefulness of Hyperprogram, where you can instantly shift the aperture or shutter speed (front and rear dials) with the camera shifting other program parameters

    this sounds very similar to what is available on Minolta/Sony & I just always presumed that all other camera manufacturers had similar?
  • Wesley Fink - Tuesday, March 11, 2008 - link

    The Sony A350 has not yet shipped in the US market. It is not even available direct from Sony, who says it will be available March 24th. Amazon is showing the A350 will be released April 25th. The new Sony A200, announced at CES, has been available in the US for several weeks.
  • Heidfirst - Wednesday, March 12, 2008 - link

    I am assured that the A350 is now shipping in the USA - 1 well known guy on the forums is expecting his today.

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