Originally Posted by Sennaspeed
A larger diameter tube is MORE rigid when wall thickness remains constant.
You can bend an aluminum arrow shaft with your hands but increase the diameter to 1" and, even with the same wall thickness, you can't bend it.
I agree, however, if the tube thickness is constant from the smaller diameter to the larger is entirely a crapshoot because no manufacturer states that and never will.
To maintain a thicker wall increases scope weight, an undesireable trait.
I always look at the optic weight as it relates to the whole package. I don't want to lug around a tank unless it's on horseback and it in a scabbard,
Notwithstanding, bigger tube more elevation travel. I know that well, I have an older Mark3 with a 1" tube and it's easy to run out of adjustment without a cant rail.
Newer scopes are going to a one piece tube/erector compartment assembly, I presume welded as one piece. It would be very hard to draw the tube ends and erector compartment in one piece.
One piece makes the entire (weldment) more rigid with a thinner wall.
Like I stated, the biggest drawback is limited elevation travel.