John, I don't know if this is true, but I've heard that larger lenses are easier to make than smaller ones regarding the grind and curvature. I don't know how much that would help the manufacturer in making internal scope lenses (between 1" lenses vs 30mm lenses) but perhaps that could be one of the reasons that the larger lenses produce a better image, potentially. With some of the mid-priced bino's I've owned over the years I usually liked the image of 42mm bino's compared to 32mm models in the same make and model
