Put the Alpen Kodiak 20-60x60 and the Alpen Shasta Ridge 20-60x80 side by side and almost everything about them is identical: the same BAK-4 Porro prisms, the same fully multi-coated glass, the same 20-60x zoom range, the same 45-degree angled body. One number separates them — the objective lens, 60mm versus 80mm — and that single number is the entire decision when you shop a 20-60x60 vs 20-60x80 spotting scope. Bigger glass gathers more light and resolves finer detail; it also costs more and weighs more. Whether the upgrade earns its keep comes down to one question: when and where do you actually glass?
TL;DR — Quick Summary
The 80mm Shasta Ridge gathers 78% more light and resolves roughly a third more detail than the 60mm Kodiak — for about 2.3x the price and 1.4 lb more weight.
Kodiak 20-60x60 ($187.49 MSRP): the pick for backcountry hunters, daylight glassing at moderate power, and anyone who wants the most usable scope for the least money.
Shasta Ridge 20-60x80 ($437.49 MSRP): the pick for dawn and dusk game judging, reading hits past 300 yards, and stationary glassing where weight is a non-issue.
Table of Contents
- Overview: Why Aperture Is the Only Spec That Matters Here
- Alpen Kodiak 20-60x60 — The Scope You'll Actually Carry
- Alpen Shasta Ridge 20-60x80 — The Low-Light Reach Scope
- 20-60x60 vs 20-60x80 Spotting Scope: Head to Head
- Which Should You Buy? Real-World Scenarios
- The Verdict
- How Big Should You Go? The Objective-Size Ladder (60 to 85+)
- Frequently Asked Questions
Overview: Why Aperture Is the Only Spec That Matters Here
Most spotting-scope comparisons are muddy because two scopes differ in a dozen ways at once — glass grade, coatings, prism type, price tier — and you can never tell which difference you're actually seeing. These two Alpen scopes are the rare clean experiment. Hold brand, prism, coatings, zoom, and body angle constant, and every performance gap traces back to a single variable: 60mm versus 80mm of aperture. Here is exactly what that aperture buys.
Light gathering scales with area, not diameter
The 80mm objective is one-third wider than the 60mm, so it is tempting to assume it gathers about a third more light. It gathers far more than that. Light collection scales with the area of the objective, which grows with the square of the diameter: (80 / 60)² = 1.78. The 80mm pulls in roughly 78% more light at any given magnification. (Ignore the widely copied claim that "10% more diameter equals 75% more light" — that is simply wrong; 10% more diameter is only about 21% more light. Always square the ratio.)
Exit pupil is where the light advantage becomes visible
Exit pupil — the width of the light beam leaving the eyepiece — equals the objective diameter divided by magnification. Your eye can only use a beam as wide as its own pupil, which sits around 2-3mm in bright daylight and dilates to roughly 5-7mm at dawn and dusk, the prime glassing hours.
| Magnification | Kodiak 60mm | Shasta Ridge 80mm |
|---|---|---|
| 20x | 3.0 mm | 4.0 mm |
| 40x | 1.5 mm | 2.0 mm |
| 60x | 1.0 mm | 1.33 mm |
In bright midday light at low power, your eye's own small pupil is the bottleneck and both scopes look nearly identical — the 80mm's wider beam is partly wasted. The advantage appears exactly where hunters live. At first and last light, a dilated eye can finally accept that wider beam, so the 80mm image is visibly brighter. And when you crank the zoom, the 60mm collapses to a 1.0mm exit pupil — the practical floor where the view goes dim and soft — while the 80mm holds a more usable 1.33mm. At any matched magnification the 80mm image is about 1.78x brighter, the same aperture advantage showing up as brightness.
Resolution: about 25% finer detail
Larger apertures resolve finer detail. The diffraction-limited resolving power, expressed as the Dawes limit (116 divided by the aperture in millimeters), works out to 1.93 arcseconds for the 60mm and 1.45 arcseconds for the 80mm. The 80mm resolves an angle about 25% smaller — roughly a third more resolving power. At 1000 yards that is the difference between resolving detail down to about a quarter inch versus a third of an inch: the edge of reading a bullet hole in a target, a tine on a distant rack, or the eye-ring on a warbler.
There is a large caveat attached, and it favors honesty over marketing (see the ceiling below).
The honest ceiling: the atmosphere often decides first
Aperture math describes the scope's theoretical best. Two real-world limits cap it:
- Usable magnification is lower than the number on the eyepiece. The magnification you can consistently use in daylight is only about half the aperture in millimeters — roughly 30x on the 60mm and 40x on the 80mm. The full 60x or 80x is reachable only in excellent, still, cool air; that top end is a best-case atmospheric ceiling, not the scope's optical maximum.
- Daytime seeing blurs fine detail. Heat shimmer, mirage, and haze routinely smear terrestrial detail to about 2-4 arcseconds — coarser than either scope's diffraction limit. On a hot afternoon at long range, the sky, not the aperture, sets the limit, and the 80mm's extra resolving power is simply thrown away.
The takeaway: the 80mm's advantages are real, but they show up most in low light and at moderate power from a stable position — not as a magic "see farther" button in the heat of the day.
Alpen Kodiak 20-60x60 — The Scope You'll Actually Carry
At $187.49 MSRP, the Kodiak 20-60x60 is built around one virtue: it is light enough that you actually bring it. At 2.1 lb it drops into a pack without much thought, rides a modest tripod, and sets up fast. The optics are honest for the price — a BAK-4 Porro prism, fully multi-coated lenses, a waterproof and fogproof body, 45-degree angled eyepiece, and a close focus of 20 feet that makes it a capable backyard birding scope as well as a range tool.
Independent hands-on reviews of the Kodiak are thin, so treat its reputation as directionally positive rather than deeply documented: field reports consistently describe it as a versatile, budget-friendly scope that performs well at lower magnification and at shorter distances (out to roughly 100 yards for reading fine detail), with the usual entry-scope caveat that the bundled tripod is best replaced with something sturdier. What you are buying is not flagship glass; it is enough scope, in a package light enough to keep on your back.
Best for: backcountry and backpack hunters, first-time buyers, casual birders, and 100-200 yard range sessions where portability and price outrank ultimate brightness.
Alpen Shasta Ridge 20-60x80 — The Low-Light Reach Scope
At $437.49 MSRP, the Shasta Ridge 20-60x80 spends its extra aperture where it counts: brightness at the edges of the day and detail at distance. It shares the Kodiak's prism, coatings, zoom, and angled body, so the step up is pure objective — plus two secondary upgrades that surprise buyers who assume the only difference is light. Its eye relief is noticeably longer (18-19mm versus the Kodiak's 12-14mm), which makes it markedly more comfortable for eyeglass wearers and over long sessions, and its field of view is actually slightly wider at both ends of the zoom (113 feet versus 107 feet at 20x per 1000 yards).
Owner reviews run strongly positive, averaging about 4.5 stars on major retailers, with recurring praise for its value against scopes costing far more, a genuinely eyeglass-friendly ocular, and a usable metal tripod in the box. The honest limitations show up too: reviewers describe it as a strong performer for spotting out to roughly 800 yards, with clarity tapering past about 300 yards, some edge softness, and reduced eye relief at maximum power. And it is big — 3.5 lb of scope that needs a sturdier tripod under it.
Best for: dawn and dusk trophy judging, target and load work past 300 yards, stationary glassing over open country or water, and anyone who wears glasses behind the eyepiece.
20-60x60 vs 20-60x80 Spotting Scope: Head to Head
Same platform, one variable. Here is how the 60mm and 80mm stack up spec for spec.
| Spec | Alpen Kodiak 20-60x60 | Alpen Shasta Ridge 20-60x80 |
|---|---|---|
| Objective lens | 60 mm | 80 mm |
| Magnification | 20-60x | 20-60x |
| Relative light-gathering | 1.0x (baseline) | 1.78x (+78%) |
| Exit pupil (20x / 60x) | 3.0 mm / 1.0 mm | 4.0 mm / 1.33 mm |
| Resolution (Dawes limit) | 1.93 arcsec | 1.45 arcsec |
| Field of view at 1000 yd (20x / 60x) | 107 ft / 52 ft | 113 ft / 55 ft |
| Eye relief | 12-14 mm | 18-19 mm |
| Prism / coatings | BAK-4 Porro / fully multi-coated | BAK-4 Porro / fully multi-coated |
| Body | 45-degree angled | 45-degree angled |
| Weight | 2.1 lb | 3.5 lb |
| Warranty | USA limited lifetime | USA limited lifetime |
| MSRP | $187.49 | $437.49 |
Why two Alpen scopes instead of a brand shootout? Because holding brand, prism, coatings, zoom, and body angle constant is the only way to isolate what the objective alone does. Every difference in the table above is the aperture talking — nothing else.
Light and low-light
This is the 80mm's decisive win. The 78% light advantage is invisible at midday and unmistakable in the last fifteen minutes of legal shooting light. If you routinely glass at dawn, dusk, or over shaded terrain, the Shasta Ridge sees what the Kodiak cannot.
Resolution and usable magnification
The 80mm resolves about 25% finer detail on paper, but remember the atmospheric ceiling: on a stable, cool morning that extra resolving power reads bullet holes and antler detail the 60mm blurs; on a hot, shimmering afternoon both scopes hit the same mirage wall well before their optics give out.
Field of view and eye relief
A quiet clean sweep for the 80mm — it is both slightly wider and considerably more comfortable behind the glass. The 60mm's tighter eye relief is the one spec where the smaller scope, counterintuitively, asks more of the user.
Weight and tripod
The 60mm's home ground. At 2.1 lb versus 3.5 lb, the Kodiak is 1.4 lb lighter, and the gap grows once you add the sturdier tripod the 80mm needs to hold its resolution steady. For anyone counting pack ounces, the smaller scope wins the only contest that matters: it is the one that comes along.
Price and value
At MSRP, the 80mm costs about 2.3x the 60mm — a real gate. The Kodiak delivers most of a spotting scope for under $200; the Shasta Ridge asks you to pay for aperture you will only cash in under specific conditions. Both sell below MSRP in our store, so check the current product pages for today's pricing.
Which Should You Buy? Real-World Scenarios
Target shooting and load development
Distance drives this decision more than magnification does. At 100 yards, the Kodiak 60mm reads even small-caliber holes easily and is the obvious value pick. At 200 yards — the practical ceiling for most sight-in work — both scopes function, though the 60mm pushed to its top power washes out while the 80mm keeps margin. Past 300 yards, or for small holes in steel and paper at distance, the Shasta Ridge 80mm pulls clearly ahead: brighter, steadier at high power, and better at resolving small hits. One caveat no aperture cures — mirage. On a hot range, heat shimmer smears detail for any scope, and cranking magnification only makes it worse; contrast targets help more than glass does.
Big-game hunting and glassing
Hunters have a rule of thumb that maps almost perfectly onto this comparison: 65 if it rides on your back, 85 if it stays near the truck. The Kodiak 60mm is the scope that actually gets carried into the backcountry and used all day; the standing truth is that if you hate packing a scope, you will leave it behind. But when you are judging antlers in the last light of legal shooting hours, the 80mm decisively wins — that is precisely when its 78% light advantage separates "there's an animal" from "I can count points." Choose by how you hunt: deep-country backpacker, take the 60mm; truck, ATV, blind, or open-country glasser scoring fine detail, take the 80mm.
Birding and backyard nature
For the mobile, all-day birder walking trails, the 60mm's light weight and 20-foot close focus make it the more pleasant companion, and in good daylight the two scopes look remarkably similar. The 80mm earns its keep for the stationary birder — set up over a marsh, mudflat, or feeder at dawn and dusk, where the brightness gap and the longer, glasses-friendly eye relief turn a long session into an easy one.
The Verdict
For most buyers, the honest first recommendation is the Alpen Kodiak 20-60x60. It is the scope you will carry, it costs well under $200, and in the daylight conditions where most people actually glass, the atmosphere caps both scopes long before the 60mm runs out of aperture. It is the safe, high-value default.
Reach for the Alpen Shasta Ridge 20-60x80 when your use case names a condition the 60mm can't meet: judging game at first and last light, reading hits past 300 yards, glassing open country from a stable rest, or spending long sessions behind the eyepiece in glasses. In those situations the 78% light advantage, finer resolution, and longer eye relief are worth every ounce and every dollar. If you glass mostly in low light or from a fixed position, buy the aperture. If you glass mostly in daylight or on the move, buy the one you'll bring.
How Big Should You Go? The Objective-Size Ladder (60 to 85+)
The head-to-head above deliberately isolates one variable, and for most buyers the answer lands on the 60mm or the 80mm. But the light-gathering math does not stop at 80mm. If you leaned toward the Shasta Ridge for its brightness, the natural next question is whether to go bigger still.
The clean next rung is the Athlon Argos HD 20-60x85 at $524.99 MSRP, under $90 more than the Shasta Ridge. It keeps the same 20-60x zoom, Porro prism, fully multi-coated glass, and 45-degree angled body, so the ladder stays honest: only the objective grows, from 80mm to 85mm. That extra 5mm adds roughly 13% more light than the 80mm and about double the 60mm Kodiak's light-gathering, at the cost of another pound (about 4.4 lb) and a sturdier tripod. It suits the glasser who has already decided reach and last-light brightness outweigh pack weight, and who wants a bit more margin at dusk without stepping into premium-glass money.
Above that sits the premium tier, where the gains shift from raw aperture to glass quality: 85mm and 86mm scopes built with ED glass for edge-to-edge sharpness and color correction. At that point the decision stops being about objective size and becomes a glass-and-model question. If that is where you are headed, our Athlon Ares vs Cronus spotting scope breakdown compares the Athlon Ares G2 UHD 20-60x85 ($1,124.99 MSRP) against the flagship Cronus line.
Frequently Asked Questions
Can a 60mm spotting scope see bullet holes at 100, 200, and 300 yards?
At 100 yards, yes — a 60mm like the Kodiak resolves even small-caliber holes comfortably in decent conditions. At 200 yards it still works for most calibers, though pushing it to maximum power washes the image out. At 300 yards and beyond, a 60mm struggles with small holes, and an 80mm becomes the better tool. Across all distances, mirage and heat shimmer limit any scope more than aperture does.
How much brighter is an 80mm spotting scope than a 60mm?
About 78% brighter at any given magnification, because light gathering scales with the square of the objective diameter: (80 / 60)² equals 1.78. That advantage is largely hidden in bright daylight, where your eye's small pupil is the bottleneck, and becomes clearly visible at dawn, dusk, and high magnification, when your pupil dilates and the 60mm's exit pupil shrinks toward its usable floor.
Is an 85mm spotting scope worth it over 80mm?
For most buyers, no. Going from 80mm to 85mm adds only about 13% more light, a difference that is hard to see in the field, while adding weight and demanding a sturdier tripod. An 85mm such as the Athlon Argos HD 20-60x85 earns its place when you are already committed to maximum brightness and reach from a stable position and want every bit of last-light performance, or when you prefer that model's particular glass and build. If you are choosing purely on aperture, put the money toward better glass at 80mm before chasing five more millimeters of objective.
Is 60mm enough for birding, or do I need 80mm?
A 60mm is enough for most birding, especially if you walk trails and want a light scope you can carry all day; in good daylight it looks very close to an 80mm. Step up to an 80mm if you bird primarily from a fixed position — over water, marsh, or mudflats — or in low light, where the extra brightness and the longer, glasses-friendly eye relief make a real difference.
What tripod do I need for an 80mm spotting scope?
An 80mm scope at 3.5 lb needs a sturdier tripod and fluid head than a 60mm does, because higher magnification and a heavier body magnify every vibration. Budget for a solid aluminum or carbon tripod rated well above the scope's weight; the light bundled tripods included with entry scopes are the first thing serious users replace. Factor that added tripod weight and cost into the 80mm decision — the system, not just the scope, is heavier.
Does a bigger objective help at high magnification or only in low light?
Both. In low light the larger objective gathers more light for a brighter image. At high magnification it also helps, because it holds a larger exit pupil where the smaller scope dims out — at 60x the 80mm keeps a 1.33mm exit pupil versus the 60mm's 1.0mm floor — and it resolves finer detail. The limit at high power is usually the atmosphere, not the scope.
Do mirage and heat haze make a big spotting scope pointless?
No, but they cap it. On hot days, heat shimmer and mirage blur detail to about 2-4 arcseconds — coarser than the diffraction limit of either a 60mm or 80mm scope — so the bigger scope's extra resolution is wasted until conditions settle. An 80mm still wins in low light and at dawn and dusk, when the air is usually calmest and its brightness advantage is greatest. Glassing early and late, and dialing back magnification when the air boils, beats buying aperture to fight mirage.