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I'd look at your picture again, it proves my point quite well. Once you get above about 44 millimeter( With a one inch tube ) on your objective lens you need to go to a larger tube diameter or your pupil size begins to decrease.
It doesn't matter if you're looking through the Hubble telescope the pupil of your eye can only take in so much light. With modern lenses above 95 percent light transmission a 40 millimeter Lens can max out the average human eye.
If scopes worked the way you're interpreting your pictures scopes would still be made with a cylindrical tube.
Boomer
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