Utter horse crap. This is like saying an astronomer can resolve the same image with a 10" telescope as with a 20'. The larger the objective lens, the more light transimission. This is simple physics. The issue with the bigger tube is a function of objective lens and focal length.
When dealing with the sizes of rifle scopes, this line is pretty much true. A larger objective lens gives you more field of view, not a brighter image.
My first reaction was the same as yours, but, strictly speaking, the author is correct. Light gathering capability is a function of objective lens diameter and is independent of light transmission (which is how much Light gets to your eye). These two properties work together to determine image brightness.
Correct..! I was thinking maybe the cost in high quality optics is in the engineering of highly efficient lenses at a smaller and lighter weight.. (?)
I agree completely! I have a lot of scopes, but I’ve owned and used even more binoculars and the author’s claim is nonsense. The quality of coatings does have a great deal to do with how much light is transmitted to the eye, but, all things being equal and given the same number of lenses, prisms and equivalent quality coatings, more light will be transmitted by optics with larger objective lenses.