You want a 40-42 objective. No hunter has ever stood in the dark in the morning with 40’s, and wishing their objective lens was smaller when waiting for enough light to come through the lens to be able to see animals.
Ten power is the sweet spot, good for glassing at distance, good to allow you to ”see” deep into the cover where possible, and not too narrow of a view.
A guy could say the same thing about 56 mm objectives.
Same with 65 mm vs 80 mm spotters. One has to draw the line somewhere and the find the best cost/benefit ratio for them and there's a lot more to consider than just objective diameter.
I have 40 and 56 OBJ binocs. The 56's stay at home 99% of the time, and my spotter is a slender, and lite weight 70mm.
There's give a take, no doubt. You just want to take the maximum that will not make you uncomfortable if there is a lot of hiking involved.
Stepping up from 32mm to 40mm OBJ gets you
56% more lens area / light gathering ability, and if that little bit of weight hinders a person's hiking, they need to get into better shape.
