-
Any increase in aperture brings an increase in light-gathering and resolution. Sizes up to 50 meters have been considered for observatory instruments; the limiting factors are cost and technology.
On the other hand, for a given application, there may well be a size that is big enough. And if you already have a telescope, a small increase in aperture, say from 15 inches to 16 inches, is probably not worth the trouble. It also happens that under poor sky conditions a larger telescope doesn't offer any better view.
On the other hand, for a given application, there may well be a size that is big enough. And if you already have a telescope, a small increase in aperture, say from 15 inches to 16 inches, is probably not worth the trouble. It also happens that under poor sky conditions a larger telescope doesn't offer any better view.
-
a larger size will always increase it effect no matter how small that effect may be. This is like building a skyscaper and asking how many floors are required to cause a situation where the skyscraper does not change in volume by adding another floor ? There is no such point obviously.
But if you build it with a thousand floors, for example, many other factors will come into play, including winds, gravity, strength of structural materials, elevators and cables, obstructions of air routes followed by aircraft, legal considerations, how to get the material up to that height, and so on and on.
But if you build it with a thousand floors, for example, many other factors will come into play, including winds, gravity, strength of structural materials, elevators and cables, obstructions of air routes followed by aircraft, legal considerations, how to get the material up to that height, and so on and on.