During our sniper school, our first night fire is always with available light and students employing their ordinary daytime optics. It's not as sexy as high-tech NODs, but the students gain tremendous respect for their abilities to engage targets with "only" a scoped rifle. The optics portion of the spotting chapter addressed the ability of quality lenses to transmit light, so we won't rehash all that material. But recall that your eye pupil dilates to 7mm in total darkness, and about 6mm on the average night, and that your scope is most effective when it produces a cone of light of this diameter.
Yes, an exit pupil of about 6mm is best for low-light shooting, and you should adjust your zoom scope's magnification to achieve this. The effect is the same as dilating your pupil to let more light enter or opening up a camera's F-stop for low-light photography. For night shooting, set your scope at the following power:
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Deer hunting is an interesting thing that reminds you of those golden old ages of 19th centuries, where a handsome hunk well equipped with all hunting material rides on horse searching for his target animal either for the purpose of displaying his masculine powers or for enticing and wooing his lady love.