Originally posted by asdf Sure, and there can be difference in quality control, etc.
Of course. That had not been mentioned yet (I don't think) in this thread.
Originally posted by asdf I'm just pointing out what is rarely mentioned for the benefit of the lurkers. A mark of a pseudoscientist is to never consider human error and/or cognitive bias.
I'll try to pretend (<g>) that you're not resorting to calling me a pseudoscientist.
If you look at my points in this thread, you should be able to see that I have not discussed random differences, quality control, or similar unavoidable variance factors - I don't think the OP was asking about such things.
In fact, when referring to my own previous resolution testing, I mentioned here that it was "based on small sample size" (2 K's and 1 A in the case of the 50/1's).
In discussing apparent contrast differences I said I was "subjectively speaking".
I also stated, "please note that I cannot say that all A 50/1.2's are a smidge better than all K 50/1.2's, but only that my A was better than my K's".
I do have to assume that the OP was interested in ~design~ differences between 50/1.2's, and not a discussion of quality control, biases, and human (and machine) errors.
We are not (or, at least, I am not) privy to what Pentax did or did not do differently when the K morphed into the A model. So, we have to go on what we can see - and I was responsively and responsibly adding to the thread what I had observed.
I read something that was contrary to what I had observed, so, "for the benefit of the lurkers" as much as anything else, I jumped in with a different set of observations.