If you want light gathering capability, you increase the objective. I would suggest a 40-50, I got a 50MM objectve a number of years ago, since then I have never bought anything else. Many say oh it equals only 2% more light gathering than 40mm, which is true....but try it, my bets are you'll love it! It is easy to go up, but brutal to go down in the objective department. I have one 32 and 40, they are on my 2 rifles I never use in the field anymore.....everything else is 50 in my cabinet.

I have 3x9, 2.5x10, 3.5x10 on my 50's. I really like the high power for the range and sight in. In the field I usually leave it in the 5 range and only have advanced it to top rating on 2 long distance shots.

JIMHO