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12-07-2013, 08:12 PM   #31
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QuoteOriginally posted by Class A Quote
The K-3 has a little less dynamic range but the difference is marginal (there is a significant difference in published scores but that's because the K-5 offers ISO 80; starting from ISO 100, they are very close to each other).

Regarding noise, the K-3 and the K-5 are practically the same with the main deviation potentially being caused by heavier (non-optional) noise reduction in the K-5.

The DXOMark scores of the K-3 and K-5 are so close to each other that any differences in the results will be imperceptible.

Of course, you have to compare two prints of the same size, or two images scaled to 2MB, e.g., for web display. The per-pixel performance of the K-3 is worse, but that is completely normal for a 24MP sensor when compared to a 16MP sensor. One must not look at 100% views and then deduce that the higher MP camera has worse performance. Per-pixel performance does not matter unless you are trying to print huge images and actually print a K-3 image larger than a K-5 image. But then you are comparing apples to oranges.

And one must not forget that more MP have their advantages as well:
  1. better resolution.
  2. more cropping potential.
  3. finer-grained noise.
Exactly, you know you're losing a bit, but you're gaining a lot more. I especially see it in the resolution I get in crop images. But, I'd still love it if Pentax came out with an FF landscape type camera. To me the K-5 is the ultimate wildlife/macro system, I haven't really had a chance to try it our on a decent landscape image. The light has been so poor. COmpared to a K-5 system, the burst and AF are to die for, despite the poo pooing around here.

12-07-2013, 08:27 PM   #32

Join Date: Sep 2011
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I'd say it is different than the k5, different enough that it requires a bit of adjustment. The curves are different, the sweet spots with noise. The fall offs are a bit more dramatic. More resolution is great but the blur and softness on the k5 was pleasing. The added resolution is what I wanted, but in some circumstances can cause difficulty, just as the macro 100mm lenses with their sharpness need skillful handling for portrait work.

Another factor is that it is more capable. I'm getting another 100mm in crop from my da300. If the noise gets up there, I lose that clarity that I didn't have at all with the k5. Focus is much better, so the awfulness of the majority of my shots is clear. The body extends possibility in some ways, which also extends the mistakes.

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