In the topic "Does perspective change when you change the focal length?" I was not allowed to reply.
Here's what I wanted to write:
"What bigotry and ignorance. I used Andy's own photos (can be seen towards end of "Does perspective change when you change the focal length?", and AGAIN showed that he and others who deny that focal length changes perspective are wrong. Since scientific experimentation and free speech have been shut down here, I am going to post my response to Andy and the original poster who banned me, in my own topic."
I also would like to tell some of the people on that thread the following, in case they follow here:
"Please stop calling people names, for it shows the weakness of your argument.
"Please stop calling people ignorant. In this case, apparent ignorance of linear perspective on the part of some called into question extensive knowledge on my part--I had to teach the damn stuff. Tough. I know many people cannot perceive it, fail at it. However, to accuse of ignorance actually reveals ignorance."

So, here is a transparency of both Andy's photos, with perspective lines indicated. The perspective is indeed changed. I'll also upload his photos, so others can explore.

Also, I found a stock photo shot by a wide angle lens, and drew the perspective lines on it. They are all over the place, thus false. I then corrected for the lens in Photoshop, and indicated the perspective lines we (and generally a 50-70mm lens sees) see.

Finally, CaptainC, whose post started the whole discussion, posted four photos, all shot from the same place, same distance, on a tripod. He had said those who thought lenses distorted perspective were wrong, and that could be proven by cropping the shorter length lens photo and overlaying it on a tele photo. I did that, because I thought, "Wow, really? That goes against what I had thought." So, I looked at two of those photos, lining up the same, most distant building in each so they matched, and found that perspective indeed had changed. Perspective lines for each shot, one set blue, one set red are overlaid.

If anyone wants to join in the discussion, with insight and honesty, please do. Mysteries remain.

You are absolutely right, different focal length lenses have a unique perspectives. The thing about this site is that there are people on this site that think that their opinions are the only truths and they will defend them with vitriolic attacks and name calling. These people have very fragile egos and they are threatened with truthful posting. The worst offenders are those that are threatened by the truth. There are enough of these kind of folks here and they make themselves heard by being very vocal and attacking anybody that threatens their reality. The worst offenders are religious freaks and it is a mistake to even consider getting into a discussion with them because they cannot see reality.

If "rooflines are curved," that immediately tells you the linear perspective is off.

"Changes in the relative sizes of elements in the foreground, middle ground and background are what clearly indicate changes in perspective."
FALSE. Linear perspective is based on parallel lines converging on a vanishing point at eye level. The spacing of objects also follows certain laws, which any long lens shot, as objects become more distant, clearly botches up. (see the example) Some call it "optical compression," but it remains bad perspective, an would not appear in a standard lens.

"You need to come up with something more substantial."
Is that a JOKE? I used CaptainC's own examples, shot on a tripod, from the same distance, at the same angled for my proof. You have SHOWN nothing of proof.

No, YOU do it. I have done it with better photos than these, and you still persist. Go ahead and superimpose them and SHOW us. I assume you are just gazing at these simple examples for your judgment. First mistake. More importantly, shoot a downtown scene or such so you get some depth. As I wrote, if you want to shoot a chair (or desk in this case) at 6 ft. your whole life, you don't have to worry about perspective distortion very much.

As to the horrid snark about spreading information, just refrain from your personal insights and stick to facts please.