Originally posted by UncleVanya First, anecdotal evidence is really hard to analyze in a meaningful way. I've had two k-3's. Both at the same time for a while, then I sold one off. Both never had any buggy problems like you mention. High iso has been fine, but that's very subjective.
I realize that I will have been unlucky with the K3, but still, there were many reports on mirror flop, and it was never solved, only a firmware update to stop the mirror action when detecting the mirror flop. To me, it is one of these things that make the difference between a camera designed with overhead, and a camera designed at the limits of what is required. I always have the feeling when out shooting with the K3 and the DA560, that I have to watch it, and not stress the processor, or it will start acting up. I have had so many instances of inexplicable failure to initiate immediate and accurate auto focus, that I dislike shooting this combo. Of course, pampering and avoiding stress on the processor will get you a long way, but then there is the moment a rare bird flies over and sits still for about five seconds, and I aim the K3-DA560 and try to focus, and it is as if the K3 needs waking up or needs some working out to get to good AF. Of course, the moment then is gone.
It may still be my particular K3, but having read much on the K3 and its issues, I think I may ask too much of a camera with limited processor power. Perhaps a dedicated AF processor would be needed to solve it... And talking about AF, how many times have I failed to focus on the eye of a distant bird because the precision of the AF points is not high enough with the K3? Many, many times, it will simply focus on the body. Some may say I was not close enough to the bird, but that's kind of inherent with rare and shy wintering or migrating birds, and the DA560 is after all designed for distant objects... I can assume sports would also need higher precision. As it is, my K3 needs something relatively sizeable to focus on, it simply fails to accurately single out something small.
Quote: Second, as an apsc shooter, what lenses would I use on my Nikon D500 that compare to the lineup of apsc specific lenses offered by Pentax? What replaces my 50-135? My DA 15? The d500 is also very pricey... As much or more than the K-1.
Sure the D500 is pricey, but if it takes away the need to upgrade, eventually it may save you money. My DA560 was 5000,- The new Sigma 500mm f4S is 6500,- I always wonder why people scare at these prices, but simultaneously buy a multitude of cheaper lenses and waste a lot on eternal camera body upgrades, or even multiple systems, like APS-C ánd FF, and don't seem to find the total sum bothering.
With a lens like the DA560 or the Sigma 500mmf4S, you have to mentally spread out the cost over many, many years, and after 3 years of use, I already start to find the DA560 worth its money. It is superbly built, and never any issues with functionality or IQ, except for the K3 failing it. A lens like that gves you unique shots and lasts a very, very long time. The same would probably apply to a 300/2.8 lens or a 400/4 lens. Whether you need reliability of the higher end sort, or whether you are fine with the level at which the K3 gets it done, that's very personal of course.
Chris