If you're talking about perspective, then I have to ask if you've read the recent thread started by SamTherapy, "Let's talk about skies".

The ratio of close to far size is about the relative distances of the objects and the chosen field of view. If you prefer a narrow field of view, then by definition you are choosing a decreased difference in apparent size of near vs. far, but ONLY if you move the camera farther away. The effect is called "telescoping", and is not the result of one environment sphere versus another, but rather due to how close the camera is to the sphere and to the subject.

Suppose you start 10 feet from a car, and 750 feet from the EnvSPhere. Then the ratio is 10/750 or 1/75. If you choose a longer focal length and and move the camera back to 75 feet from the car, then the ratio is 75/750, or 1/10. That is an enormous change in relative size and has nothing to do with the EnvSphere per se.

There is the further complication that the perspective of objects appearing in the EnvSphere image itself (before viewing it in Poser) may not be consistent with how you plan to use it. For example, I have an equirectangular image where there is a house about 15 feet from the camera. It is impossible to insert a 3D car in front of that house. There is no focal length or camera position that will make the two look consistent. It's an impossible assemblage.

Perspective is entirely driven by the relative positions of things, particularly the relative distances. People confuse perspective with the fact that when changing focal length, they MOVE to re-compose the subject. It is the movement that changes the perspective, not the focal length change.

Choosing a long focal length with the intent to move the camera and re-compose the subject will not do what you think it does until you fully integrate all of these factors in your mind. It begins with using an equirectangular image that is consistent with the perspective you wish to simulate in the scene. You can't use a parking space that is 6 feet from the camera that took the equirectangular image and put a car in it with a composition that is based on being 20 feet from the car. The two will never integrate, no matter what you do.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)