I am sure what you are describing is another example of what I was talking about. But I was thinking of the following example:
- The A and the B are exactly the same color squares.
- If you don't believe me, snip them into paint and compare.
- So I've told you that your are not seeing the reality of the situation.
- Your nervous system is modeling the scene. Even though you now know that the squares are the same color, it is still impossible for you to see objective reality.
This is just a simple example of what happens to you with everything in your world. You simply do not experience an objective reality.
Here are the squares as snipped out from the above image:
Edit: This posting is on topic in the sense that it has been discussed that we don't understand reports with respect to what they mean and that it is important to actually view through a scope and then report back what you see. My point is that what we see is entirely subjective and what I see and my evaluations are important to me, but probably can't predict another viewers response.
Edit: I love to read other's reports and they are important and interesting. I read them from the perspective of this posting.
Dave, I understand your point of view and agree with some aspects of it. It is particularly relevant if we are trying to distinguish different hues of double stars. Often even highly experienced observers cannot agree on their colors. I doubt that it is relevant in most other types of observations that are made to test the optical quality of a telescope.
The several thorough and lengthy reports posted here are from experienced observers who know what to expect from a quality telescope. In fact, it is critical to any review based on observation that the reviewer know exactly what to expect, especially if those expectations are based on the results of using telescopes of proven excellence.
Knowing what to expect when I look at the image of a stellar disc at high power is exactly what I want in order to determine the quality of the optic. If the Airy disc is not perfect, I won't see it as such just because I know what to expect from a properly figured lens. Indeed, I strive to be objective, because I want to know the limitations of the telescope that is being evaluated.
Test reports are useful, because they give the buyer a reasonable assurance of optical quality, but I place far more value on the reports of experienced users of a telescope that I am considering for purchase.