The Magnification Trap: Why Cody Nelson Still Reaches for His 8s

Why Magnification Might Be the Hardest Pillar Decision of All

Cody admits it himself: maybe magnification should have come first in this series, since it's the spec everybody fixates on before anything else. But the reason it comes later is that magnification only makes sense once you understand what you're actually trying to accomplish with your glass, and that depends entirely on terrain, hunting style, and whether the optic is staying on your chest or going on a tripod.

Choosing magnification for hunting binoculars depends on field of view and exit pupil as much as raw power. Exit pupil is calculated by dividing objective lens diameter by magnification, so an 8x42 binocular has a 5.25mm exit pupil compared to a 10x40's 4mm, meaning lower magnification gathers more light and performs better at dawn and dusk. Lower magnification also handholds steadier, since a wider field of view feels stable the way looking out the back of a moving boat does, compared to the seasick, narrow view of a side porthole at higher power. More magnification generally means a narrower field of view, with rare exceptions like Swarovski's NL Pure line. For handheld glassing, Cody Nelson favors 8x binoculars, reserving higher magnification and spotting scopes for a tripod-mounted second piece of glass in his pack.

Field of View: The Spec Most Hunters Ignore

If you're hunting hardwoods back east, tracking deer moving through trails under canopy, field of view often matters more than raw power. The same logic applies chasing rutting bulls in the open. Cody puts it plainly: if he had to trade an 8x for a 10x, he'd take the wider field of view every time, because it lets him see one bull over here and another bull over there simultaneously instead of narrowing down to one animal at a time. That wider view is often the difference between comparing two bulls side by side or missing one entirely while you're locked onto the other.

Exit Pupil, Explained (And Why It Matters at First and Last Light)

Lower magnification doesn't just mean a wider view, it also means more light reaching your eye, and that comes down to exit pupil. Exit pupil is your objective lens diameter divided by your magnification number. A 10x40 binocular works out to a 4mm exit pupil. An 8x42 works out to 5.25mm. That difference is the actual beam width of light hitting your eye, and it's why an 8x42 performs noticeably better in low light, early morning, late evening, the exact windows when animals are most active. A wider exit pupil means you're more likely to catch movement, or spot a bull mid-bugle, before a higher-magnification optic would even resolve him clearly.

The Porthole Analogy: Why Lower Magnification Handholds Steadier

Lower magnification is also just easier to hold steady by hand, and Cody has a specific way of explaining why. Picture standing at the back of a rocking boat, looking out at the horizon. You can see horizon to horizon, and it feels stable even as the boat moves. Now picture looking out a side porthole instead, where all you see is ocean rising and falling in a narrow frame, the kind of view that makes people seasick. An 8x binocular is the back-of-the-boat view. Higher magnification narrows that field down toward the porthole, and the shake in your hands becomes a lot more noticeable the tighter that view gets.

The Trade-Off: More Power Almost Always Costs You Field of View

Here's the tension at the center of every magnification decision: more power generally means less field of view. Step up from 8x to 10x, from 10x to 12x, and you're trading away some of that wide, stable picture for a tighter, more zoomed-in one. There are exceptions. Cody specifically calls out Swarovski's NL Pure line as an anomaly, since it manages a genuinely wide field of view even at higher magnification, a different enough conversation that it deserves its own discussion entirely. But for most binoculars on the market, the trade-off holds: more zoom, less horizon.

10x vs 12x: What Actually Changes When You Add a Tripod

Assuming equal glass quality, Cody's honest answer is that he'd often take the 10x over the 12x, especially for chest glass, purely for the field of view and handheld steadiness. But here's the nuance worth remembering: put both a 10x and a 12x on a tripod side by side, and the 12x doesn't automatically out-glass the 10x just because it's got more magnification. Once you remove handheld shake from the equation, the advantage of raw power narrows considerably, which is exactly why pairing higher magnification with proper stabilization, covered in the tripod pillar of this series, matters so much.

Cody's Own Kit: 8s on the Chest, More Power in the Pack

Be diligent about knowing your terrain and what actually matters to your hunt. If you're a mover, constantly walking and glassing handheld, Cody's go-to is an 8x on the chest, every time. If he's carrying a second piece of glass, he wants a real jump in power, at least four magnifications more, something in the 12x to 15x range in the pack, plus a spotting scope for the situations that call for it (a subject for another episode). That combination, a wide, steady chest optic paired with a higher-power piece reserved for a tripod, is the same logic covered in 15s, 18s, or a Spotter?, just applied one step earlier in the decision process.

The Golf Club Rule: Pick the Right Tool for the Job

Cody likens his optics collection to the PGA's 14-club rule, except he doesn't limit himself to 14. He likes having enough different optics on hand to pick the right tool for the specific job in front of him, rather than trying to make one binocular do everything. The takeaway isn't that you need to own five pairs of binoculars. It's that magnification isn't a single right answer, it's a decision that should shift based on whether you need light gathering and field of view, or distance and detail, and where you're actually hunting.

Put It Together

Magnification feels like the obvious first decision, but Cody's real advice flips that assumption. Start with what your hunting style actually demands: wide field of view and steady handheld glassing favors lower power like an 8x, while distance and fine detail favor stepping up, ideally on a stable platform rather than handheld. Exit pupil explains why lower magnification performs better in low light, and the porthole analogy explains why it handholds steadier. Add power deliberately, in your pack rather than around your neck, and pair it with the right head and bino adapter once it's time to mount it up.

That rounds out another piece of the Three Pillars of Glassing framework. Got a specific setup