Originally posted by bdery I don't believe I insulted anyone so far.
You did not curse at anyone but I found the implication of your "
playing with words" statement insulting and I
have told you that I found it offensive.
The only way in this situation for you not having insulted me is for the insult to be a figment of my imagination. Here's why I don't think we are dealing with the latter case:
"
Playing with words" at the very least implies that my statements had no substance. If someone has real arguments to put forward, why would they be "playing with words" instead?
Furthermore, why do people "play with words"? Typically, they have manipulation in mind, don't they? They don't have real arguments but still want to achieve an effect. Often, people "playing with words", are trying to weasel their way out of a losing argument without admitting to the fact that they have nothing left to counter with.
None of this applied in my case. I provided a solid explanation why your summary of what "equivalence" is about was misleading. I'd even go as far as saying it was a clearly written explanation, so I take issue with someone referring to my factual explanation as "playing with words".
This discussion is getting a bit out of hand. I did feel uneasy somewhat venting my frustration in a response to you in the first place. Other people said much more offensive things ("
This nonsense again", "
What drivel", ...), but I found it hard to maintain an entirely friendly tone when responding to your post, partially because I expect more from someone who studied optics.
Originally posted by bdery Only when the distribution is small enough. Small as in, as I said, "so small you can count individual photons". We are far from this when taking pictures.
That's not true.
If you have so many photons that we are "far from" counting "individual photons" then shot noise absolutely dominates. Modern sensors have a read out noise of just a few electrons, so in the presence of a lot of photons, read out noise becomes insignificant.
Anyhow, may I remind you that the noise argument started with your claim that "
Noise is driven (all other things being equal) by the pixel size." and that this is unequivocally wrong (when talking about "image noise" as I did) and I already gave you a lot of pointers. No point in shifting the discussion away from the original points and no point going around in circles either.
Originally posted by bdery I wrote that because you refuse to understand that we are not talking about the same thing. I am talking about the noise on an individual pixel, not disagreeing with you. But you are NOT talking about what I AM talking.
OK, fair enough. It would help tremendously if you explicitly stated that you are talking about "pixel noise" when you use the term "noise". In particular, when responding to a post of mine, in which I explicitly talked about "image noise".
If you just use "noise" I think it is very reasonable to assume that you are talking about something that photographers should have an interest in, i.e., "image noise".
Out of curiosity, why are you concerned with the noise of an individual pixel?
If you understand that as the number of pixels increase the pixel noise increases as well (everything else being equal) but the overall noise does not, then why do you care about pixel noise?
Originally posted by bdery Sample size of 1 = infinite standard deviation
You could also argue that the variance is zero and that (biased) standard deviation is the square root of the variance.
Anyhow, the point is that increasing the number of samples when measuring sensors would make it harder for an outlier to influence the results, however, I don't understand why this concerns you. Do you believe there is high variance in sensor production? Surely, if the theory on noise and DxO measurements coincide, you don't suspect that this is due to an unfortunate coincidence of sensor outliers, or do you?
The main point is that the question of how accurately DxO measurements represent the average performance of 15 or more sensors is entirely irrelevant. Your dissatisfaction with DxO's precision does not invalidate the argument I made (which was about pixel size not being a significant influence on image noise). If you reject DxO as evidence based on a "one sample" approach then you are saying that the agreement between theory and DxO measurements is purely due to sample variation. That's an untenable position, AFAIC, not forgetting that one can find other evidence from other sources.
BTW, DxO measurements confirm your statement that
pixel noise increases with decreasing pixel size. Does that give you more confidence in their results?
Originally posted by bdery Assuming the observations obtained from 1 sample are perfectly representative of the whole product is simply wrong.
I never stated that DxO achieves a "perfect" representation. This is a strawman.
Originally posted by bdery I never called anyone an idiot.
Not explicitly, but if you state that "
Mixing "evidence" and "DxO" in the same sentence is funny." you are implying that it is foolish to rely on DxO measurements. By implication, it would be idiotic to create a website whose results are based on DxO measurements, if it really were true that DxO results cannot be trusted.
Originally posted by bdery He is discussing average noise over an area. I often wrote in agreement to this when people complained that the K-3's sensor had worse pixel-per-pixel noise performances than the K-5. However in this particular thread I am discussing noise at the pixel size.
Again, can you please let me know why you are talking about the noise of an individual pixel?
The only way in which pixel noise would be relevant to a photographer is if the photographer made the size of prints (or monitor viewing sizes) dependent on the number of source pixels. In practice, however, photographers use certain output sizes independently of the number of source pixels. An 8x10 print does not become an 16x20 print just because someone went from 6MP to 24MP.
It is true that when one tries to exploit the increased resolution of a higher MP image by printing larger that one will then see more noise, but enlargement always causes apparent noise to increase. I have always made it clear that I'm talking about image noise, so when you are suddenly discussing pixel noise (and not make the shift explicitly clear), it is obvious that your arguments do not make sense to me.
Originally posted by bdery In fact that's not what I was discussing at all at first. I was saying the 70-200 was too big for me.
Now, if only you just said that.
I can guarantee you that neither Mistral75 nor I would have responded to a simple "too big for me" statement. Instead you wrote --
Originally posted by bdery Seeing the 60-250 next to the 70-200 convinced me that for my lifestyle I don't want FF.
-- implying that format size had a significant impact on lens size/weight.
Now, you then agreed that Mistral75's and my responses were valid and everything would have been fine if someone had not picked up on the format size comparison again. I specifically and on multiple occasions suggested to not enter this discussion but it did not help. In the end, I'm characterised as someone who "shoves the equivalence discussion into people's faces". Oh, well.
Last edited by Class A; 11-24-2015 at 03:57 AM.