Make the investment in quality. When in low-light conditions, there’s a lot of detail that the human eye simply cannot detect. With many game animals being observed during periods of reduced or poor visibility, the more clarity under less-than-ideal conditions the better. Make the investment in the highest quality optics you can afford.
Set up properly. Animals can easily pick out predators or threats when they are highlighted on the skyline, especially when these predators are moving. Carefully approach your set up, avoiding skylining yourself and if possible, keep shrubs or trees behind you to break up your outline. Get comfortable as you could be glassing for several hours or even the entire day. Sit on a foam pad and make sure you have ample food and water.
Use a tripod. Nothing beats a tripod while glassing to reduce vibration and allow you to pick through terrain features and spot the smallest movements. Outdoorsmans.com will mount a stud to the bottom of many brands of binoculars for tripod compatibility; a simple bungee cord will even do the trick. Keep in mind that high magnification isn’t always best because it can make your field-of-view look dimmer. Also, the higher the magnification the more stable the tripod rest needs to be in order to mitigate vibration.
Stay on target. There’s nothing more frustrating than when you find an animal in your bino and then can’t find it in your spotting scope to get a better look. It’s happens regularly. When you find an animal in your bino, be sure to pan left, right, up and down to locate some sort of reference point that’s big and noticeable before you take your eyes off of it. Once you mentally note obvious land marks or reference points, transitioning to the spotting scope is easier, plus you can now relay the animal’s location to a hunting partner.
One more tip: If you’re with someone and they’re having a difficult time locating what you’re seeing, have them stand directly over your shoulder looking in the same direction and on the same focal plane as you’re looking. Oftentimes, they can spot the animal quickly by mimicking your viewing angle.