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Our top pick
Vortex Solo R/T 8x36
A 4.5 mm exit pupil, 18 mm of eye relief and an MRAD ranging reticle in a unit that weighs a third of a binocular.
Price as of October 5, 2026. #ad How we earn
Deer hunting has one characteristic that dominates the monocular decision: the animals move in the first and last thirty minutes of legal light. That is an exit pupil problem, and it eliminates most of the category on arithmetic before you compare glass.
The filter
Exit pupil is objective divided by magnification. Your dark-adapted pupil opens to roughly 5 to 7 mm. A 10x25 monocular delivers 2.5 mm - less than half of what your eye could use at the exact moment deer are moving.
| Format | Exit pupil | Verdict for deer hunting |
|---|---|---|
| 10x25 | 2.50 mm | Daylight backup only |
| 8x25 | 3.13 mm | Daylight backup only |
| 8x36 | 4.50 mm | Usable at legal light. The pick. |
| 10x42 | 4.20 mm | Usable, and nearly binocular-sized |
| 8x42 binoculars (for reference) | 5.25 mm | Better than any monocular here |
So the shortlist is short: an 8x36, or a 42 mm monocular that has given up most of its size advantage. Everything else is a daylight tool, and a daylight tool is the wrong purchase for an animal that moves at dusk.
Quick picks
Ranked by the criteria published on how we review. Tap any row for the full write-up, or go straight to the current price.
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 1 | Vortex Solo R/T 8x364.5 mm exit pupil, 393 ft of field, 18.0 mm eye relief. | Best for deer huntingRanging reticle in a pocket | 8.6out of 10 | |
| 2 |  Bushnell Legend 10x42 MonocularA 42 mm objective at 4.2 mm exit pupil, about $174. | Brightest optionLow-light monocular | 7.6out of 10 | |
| 3 |  Vortex Solo 10x25About $79 and a few ounces - a daylight tool. | Best pocket backupThe pocket backup | 7.9out of 10 | |
| 4 |  Vortex Diamondback HD 8x42Binoculars at 5.25 mm exit pupil for about $239. | The honest alternativeBudget low-light pick | 8.4out of 10 |
Prices are pulled live from Amazon and were last checked October 5, 2026; if a figure cannot be verified the button reads "Check price" instead. Scores are our editorial judgment against the published ranking criteria, not a test result. #ad How we earn.
What a monocular is actually for from a stand
Not glassing. From a treestand you are not searching a hillside - you are confirming things repeatedly at close range. Is that a deer or a stump. Is that an antler. Is the animal at 60 yards a shooter.
For that job, less motion matters more than image quality. A monocular comes up one-handed with your bow in the other hand, and it comes up with less movement than a binocular does. Over a four-hour sit where you make thirty of those checks, that is a genuine advantage.
What it is not for is the twenty minutes at the end of light when you are trying hard to see into shadow. That is when you want two eyes and 5.25 mm of exit pupil. Our whitetail binocular picks.
Eye relief from a stand
Worth a note because stand positions are awkward. You are often braced against a tree, leaning, with a harness on, bringing the optic up at an angle. Generous eye relief - Vortex publishes 18.0 mm for the Solo R/T (verified 2026-10-05) - means you get a full field without precise positioning. Short eye relief in that situation is genuinely frustrating.
The picks in detail
Price as of October 5, 2026. #ad How we earn
Vortex Solo R/T 8x36
A 4.5 mm exit pupil, 18 mm of eye relief and an MRAD ranging reticle in a unit that weighs a third of a binocular.
| Magnification | 8x |
|---|---|
| Objective lens | 36 mm |
| Eye relief | 18.0mm |
| Field of view | 393' @ 1000 yds |
| Angular field of view | 7.5º |
| Close focus | 16.4' |
| Weight | 9.7 oz. |
| Length | 4.9" |
| Exit pupil (computed) | 4.5 mm |
| Twilight factor (computed) | 17 |
Specs verified 2026-10-05 from Vortex's published specification. Exit pupil and twilight factor are computed, not quoted.
What it does well
- R/T ranging reticle estimates distance without batteries
- 18.0 mm eye relief, verified in Vortex's published specs
- Half the bulk of binoculars
Where it gives ground
- One eye tires faster than two over a long sit
- No depth perception, which matters in cover
Skip it if
You glass for more than a few minutes at a time.
How this score breaks down
- Low-light performance (weight 4)7.5
- Size and weight (weight 4)8.5
- Optical quality per dollar (weight 4)9.0
- Eye relief (weight 2)9.5
- Build and sealing (weight 2)9.0
Weights and definitions are published on how we review. These are editorial judgments from published specs and documented consensus, not test results.
The only format here that is genuinely usable at the end of legal light. Vortex publishes 18.0 mm of eye relief and 393 ft of field (verified 2026-10-05), both generous for a monocular - which matters from a stand where you are braced awkwardly.
Price as of October 5, 2026. #ad How we earn
Bushnell Legend 10x42 Monocular
A 42 mm objective gives a 4.2 mm exit pupil, which is the only way a monocular stays usable at legal light.
| Magnification | 10x |
|---|---|
| Objective lens | 42 mm |
| Exit pupil (computed) | 4.2 mm |
| Twilight factor (computed) | 20.5 |
Magnification and objective are the manufacturer's own model designation; exit pupil and twilight factor are computed from them. We could not machine-read Bushnell's spec page, so the remaining published figures are not listed rather than guessed.
What it does well
- 4.2 mm exit pupil matches a 10x42 binocular
- ED Prime glass
- Still far smaller than binoculars
Where it gives ground
- Bulky for a monocular - most of a binocular's volume
- One-eyed viewing at 10x is tiring
Skip it if
Size is the reason you want a monocular at all.
How this score breaks down
- Low-light performance (weight 4)8.5
- Size and weight (weight 4)6.0
- Optical quality per dollar (weight 4)8.5
- Eye relief (weight 2)7.0
- Build and sealing (weight 2)8.0
Weights and definitions are published on how we review. These are editorial judgments from published specs and documented consensus, not test results.
The light-gathering answer, at the cost of being nearly as bulky as binoculars. If low light is the only consideration, this wins the page.
Price as of October 5, 2026. #ad How we earn
Vortex Solo 10x25
A 2.5 mm exit pupil says this is a daylight optic, and at $79 and a few ounces that is exactly the job it is for.
| Magnification | 10x |
|---|---|
| Objective lens | 25 mm |
| Eye relief | 14.5mm |
| Field of view | 315' @ 1000 yds |
| Angular field of view | 6.0º |
| Close focus | 16.4' |
| Weight | 5.6 oz. |
| Length | 4.4" |
| Exit pupil (computed) | 2.5 mm |
| Twilight factor (computed) | 15.8 |
Specs verified 2026-10-05 from Vortex's published specification. Exit pupil and twilight factor are computed, not quoted.
What it does well
- Small enough to live in a bino harness pocket
- 10x in a unit you forget you are carrying
- VIP warranty
Where it gives ground
- 2.5 mm exit pupil is dim at dawn and dusk
- Narrow field makes scanning slow
Skip it if
This would be your only optic. Buy binoculars.
How this score breaks down
- Low-light performance (weight 4)5.0
- Size and weight (weight 4)9.5
- Optical quality per dollar (weight 4)9.0
- Eye relief (weight 2)7.0
- Build and sealing (weight 2)9.0
Weights and definitions are published on how we review. These are editorial judgments from published specs and documented consensus, not test results.
Here as a backup rather than a primary. At 2.5 mm of computed exit pupil it will not help you at the end of legal light, and it costs almost nothing to have in a pocket.
Price as of October 5, 2026. #ad How we earn
Vortex Diamondback HD 8x42
A 5.25 mm exit pupil and 17 mm of eye relief at the $250 tier, which is the combination most first upgrades actually need.
| Magnification | 8x |
|---|---|
| Objective lens | 42 mm |
| Eye relief | 17 mm |
| Field of view | 393 feet/1000 yards |
| Angular field of view | 7.5 degrees |
| Close focus | 5 feet |
| Weight | 21.8 oz |
| Height | 5.8 inches |
| Width | 5.1 inches |
| Exit pupil (computed) | 5.25 mm |
| Twilight factor (computed) | 18.3 |
Specs verified 2026-10-05 from Vortex's published specification. Exit pupil and twilight factor are computed, not quoted.
What it does well
- 5.25 mm exit pupil, the same figure as the Viper HD 8x42
- 17 mm eye relief works with glasses
- 393 ft field of view is wide for the money
Where it gives ground
- 8x limits you in genuinely open country
- Focus wheel is stiffer than the Viper's in the cold
Skip it if
You glass across canyons - the extra magnification matters more than the brightness there.
How this score breaks down
- Low-light performance (weight 4)8.5
- Size and weight (weight 4)6.0
- Optical quality per dollar (weight 4)9.5
- Eye relief (weight 2)9.0
- Build and sealing (weight 2)10.0
Weights and definitions are published on how we review. These are editorial judgments from published specs and documented consensus, not test results.
Included because a page about deer-hunting monoculars has to say it: 5.25 mm of exit pupil, 393 ft of field, two eyes, for $239. If bulk is not your binding constraint, this is the better optic.
Questions people actually ask
What is the best monocular for deer hunting?
Is a 10x25 monocular good enough for deer hunting?
Monocular or binoculars for a treestand?
Do I need a rangefinder as well as a monocular?
Sources
- Vortex Solo R/T 8x36 published specifications - read 2026-10-05
- Vortex Diamondback HD 8x42 published specifications - read 2026-10-05