Originally posted by ndevlin While I originally blamed sensor-angle, we have added an addendum to the article in which we posit that internal misalignment of the sensor or lens plane is a more likely culprit.
Frankly I'm amazed that you don't really know what happened, yet you give Pentax some homework to do
at the end of your article.It all begins to make sense, and it all delivers a message to the other camera manufacturers to get their act together: in this pricing stratosphere, there's no excuse for not going the whole nine yards on technical excellence.
What if it turns out that Pentax is not to blame? Wouldn't that be mighty embarrassing?
Originally posted by ndevlin Forget everything you know about hyperfocal in film when dealing with digital.
Hmmh, perhaps you want to write to all the DOF calculator websites that they have to change their software. Well, perhaps not.
In your article you also write
While DOF should cover off an minor angularity on the plane of focus at these focal lengths at this distance, it has been suggested that DOF with digital is not the same in practice as with film.
The idea that the notions of DOF and hyperfocal focusing change with digital photography is simply crazy.
Do you know the definition of DOF? Do you know that it includes a definition of acceptable sharpness that a) differs among manufacturers and b) certainly isn't based on the assumption of pixel-peeping at 100% crops?
Did you use a mirror to align the camera to the wall? That the wall should be within the DOF will not guarantee that it will stay sharp across the image. Only one infinitely thin plane is in exact focus, everything else behind or in front of it is out of focus. What is still acceptably sharp depends on the enlargement and the viewing distance. You certainly cannot expect pixel-to-pixel sharpness in 100% crops even if something is within the DOF.
Maybe the one Pentax lens has an issue after all, but I'm quite amazed what you are writing about digital DOF and hyperfocal focusing, and that you are happy to give Pentax some quality assurance homework without having any solid results yet.
Originally posted by ndevlin ... so let others suffer the agony of early adoption...
Agony?
Even if you personally had tough luck, why should someone else too and where is the "
agony"?
Come on.