What do you know about the eye relief on the Kowa?
The Kowa 20-60x Zoom has 16mm ER, 97' FOV @20x, and 53' FOV @60x
For longer ER, the fixed 25x and 30x would be your huckleberry.
25x has 32mm ER and 110' FOV
30x has 20mm ER and 126' FOV
The Kowa is water and fog proof, but is not rubber armored.
The Leupold 12-40x60mm HD has 30mm ER, 168' FOV @12x and 52' FOV @40x
