Greetings,
Agree with Micky, Zimmer and Husky above. Light transmission depends on the quality of the lenses and the size of the exit pupil or Micky's magnificent 7mm. Big lenses do not gather light like a dog rounding up sheep. This is just marketing BS and hype. The human eye can not use a scope exit pupil (the beam of light coming out the back of the scope) of much more than 7mm. For those of us with a few k's on the clock it is rather less than 7mm, one of the reasons that senior shooters tend to replace their scopes for ones with better and more expensive lenses with better coatings. Fat tubes have nothing to do with light transmission but certainly help with dialling.
Regards Grandpamac.
PS. Writing this post got me thinking about my T3 6.5x55. About the time I retired I bought a Leupold 6x36 scope for it thinking it would be a nice light rifle for Grandpa walks on the ridge north of Kiwi Saddle. I have just been standing out on the deck and can see that the ridge is still there but the body (at least for now) is not up to it. So will i sell my little T3 or put a bigger scope on it? Hell no!
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