Robin, good post, and I pretty much agree, although this first part seems contrdictory to me:
Originally posted by rparmar As I have stated, I do not think there is "pixie dust" in the FA Limited lenses, for the reason that this would imply something unexplained, whereas Jun Hirakawa has in fact explained this thing. If this contentious phrase is used, it is only as short-hand because we are unable to verbalise the MTF etc. (Not to mention that these measurements have not been made available to us by Pentax.) Also it could be that no existing measurement would reveal the distinctive rendering. I'm not sure: one can read a lot from an MTF graph including quality of bokeh.
I could be reading it wrong, but it seems like you start by saying that PD is perfectly explainable, objectively describable, if only we can interpret MTF charts, and then go on to allow that "distinctive rendering" might not be measureable under existing known parameters. IMO, it's the second part that rings true. I'd just add that 'inability to verbalise MTF data' is not precisely equivalent to 'no existing measurement can reveal....'
Steve, honestly your reply surprised me, seemed like it was coming from a different person that your other posts. I think your accusation of elitism was overwrought, and in fact became sort of a Straw Man itself, in that you were ascribing words/attitude to Robin that I personally did not detect.
I don't see any elitism at all in postulating that some images could have characteristics that not everyone can detect. Based on the natural variability of practically everything in the real world, particularly in the physical and mental capacity of biological beings, it would be surprising if that were
not the case. And claiming that something might be evident to person A, but not person B in no way asserts any inferiority of person B to A or vice versa. And I'll reiterate what I said before: differences in perception can to some extent be trained, but are also to some extent innate. I know you disagree, and that's cool. We also will continue to disagree on the matter of 'no false positives.'
I'd also throw away your argument about the great photographers in history. Photography has changed, not only in the available gear, but even, to some extent, in what people can do, and try to do with it. Those dead guys did not have the same range of products to work with. While I'm sure they all had their preferences in gear, they simply did not have the same level of possibility in reproduction and resolution as we have been given with modern sensors, lens coatings, etc. Even Adams, in
The Camera, said something to the effect of (I am totally paraphrasing from memory here) "even the cheapest/worst lenses available today are all substantially better than what I had available during most of my career." And that was in the early 1980s at the latest. And with regard to technique, and what they saw as "quality" in a photographic result, we can hardly expect someone who saw sharpness as a "bourgeois concept" (HCB) to have spent time worrying about the subtleties of fine glass on a regular basis.