Basically what I am saying is that it takes a larger tube to transmit the extra light from a larger objective. So going to a 50 mm OL is alright if you go to the 30 mm tube.
With identical lenses and coatings,a 30mm tube will not transmit more light.That ability is limited by the lens sizes and lens coatings.And several companies,including Leupold actually use 1" lenses in 30mm tubes.
A post from an optics forum.
According to Zeiss' sales representative in Norway, and this woman knows optics, there's no noticeable difference in light transmission in 30mm tubes vs 1". As the light passing through the tube is a aprox 3-4mm in diameter it wouldn't really matter whether you have 1", 26mm, 30mm or 34mm...
And according to Swarovski, they could make a scope with a 19mm tube with the same light transmission as on their 30mm scopes. A friend of mine has been at some course at the Swarovski plant in Tirol, three times, I believe - and each time the question about light transmission in 1" vs 30mm has been asked, and each time the answer has been "no difference
Please do not fall prey to the "Brightness" and "Clarity" posts. These terms are subjective, and not really pertinent to the scope purchasing procedure. It is not difficult for a scope to be bright or clear in a showroom.
Brightness and clarity are indeed subjective,but they are real qualities that can be seen in the right conditions which as I previously posted,do not include the inside of a store.