Nikon Monarch M5 8x42 vs Nikon Monarch M5 10x42
Quick take: The Nikon Monarch M5 8x42 costs $10 less; the Nikon Monarch M5 10x42 reaches farther (10x vs 8x); the Nikon Monarch M5 8x42 has a wider field of view (335 vs 293 ft @ 1000 yds).
Field of view, to scale
Top-down view · drawn to true scale — no exaggeration
Which one to buy
Ten dollars apart, these are the same Monarch M5 with different magnification, and owners of both describe the same character: ED glass that keeps fringing well controlled, a sharp, bright center, a locking diopter, solid build and a narrow, tunnel-like field. They share the 8.2 ft close focus and Nikon's limited lifetime warranty, and they weigh nearly the same at 22.2 oz and 22.6 oz.
The Nikon Monarch M5 8x42 has the edge almost everywhere else. Its 335 ft field is still narrow for an 8x, but the 10x42's 293 ft is narrower again. Its 5.25mm exit pupil beats 4.2mm when the light fades, which is why whitetail hunters like it, and its 19.5mm of eye relief is a touch more generous than the 10x's 18.4mm. Owners of the 10x42 add that 10x on a light body shakes, and some find its focus wheel needs steady pressure rather than gliding.
The Nikon Monarch M5 10x42 makes sense in open country, where its reach helps you study distant animals from a stand or across a field, and its owners report it beating rival mid-range binoculars for edge-to-edge sharpness. Neither escapes the family's smaller complaints: 8x42 owners call the case and strap underwhelming, and 10x42 owners point out that Nikon's warranty is far more restrictive than the no-fault coverage some rivals offer at this price.
For birding, timber hunting and general use, the 8x42 is the better choice.
Nikon Monarch M5 8x42
For birding, timber hunting and low light, the steadier, brighter, wider 8x is the M5 to get.
Nikon Monarch M5 10x42
Worth the extra $10 if you glass open country and study distant animals from a stand or a rest.
| Spec | Nikon Monarch M5 8x42 | Nikon Monarch M5 10x42 |
|---|---|---|
| Approx. price | ~$340 | ~$350 |
| Use case | Birding | Hunting |
| Magnification | 8x | 10x |
| Objective | 42mm | 42mm |
| Exit pupil | 5.25mm | 4.2mm |
| Field of view | 335 ft @ 1000 yds | 293 ft @ 1000 yds |
| Eye relief | 19.5mm | 18.4mm |
| Close focus | 8.2 ft | 8.2 ft |
| Prism | Roof | Roof |
| Glass | ED | ED |
| Coating | Fully Multi-Coated | Fully Multi-Coated |
| Weight | 22.2 oz | 22.6 oz |
| Dimensions | 5.5 x 5.1 in | 5.6 x 5.1 in |
| Warranty | Limited Lifetime | Limited Lifetime |
Feature comparison
Nikon Monarch M5 8x42
- ✓ED Glass
- ✓Phase-Corrected
- ✓Dielectric Coating
- ✓Waterproof
- ✓Fogproof
- ✗Image Stabilized
- ✓Tripod Adaptable
- ✗Magnesium Body
- ✓Locking Diopter
Nikon Monarch M5 10x42
- ✓ED Glass
- ✓Phase-Corrected
- ✓Dielectric Coating
- ✓Waterproof
- ✓Fogproof
- ✗Image Stabilized
- ✓Tripod Adaptable
- ✗Magnesium Body
- ✓Locking Diopter
What birders say
Nikon Monarch M5 8x42
- ✓ED glass at $250 delivers noticeably cleaner high-contrast edges than the Prostaff line - fringing on backlit birds is well controlled
- ✓Very bright, sharp central image - reviewers and owners consistently rate the sweet-spot resolution among the best under $300
- ✓Continues the legendary Monarch 5 lineage - a track record of durability that long-time users measure in decades
- ✓Excellent build quality with a solid, dense feel that owners contrast favorably against the plastickier Prostaff bodies
- ✓Long eye relief (about 19.5mm) with firm click-stop eyecups makes it reliably comfortable for eyeglass wearers
- ✓Fully waterproof and fogproof with a proven armor that survives real hunting abuse
- ✓Fast, precise focus with a well-weighted wheel - a clear step up from the Prostaff P7's inconsistent focuser
- ✓Strong dawn/dusk performance thanks to dielectric prism coatings plus ED glass - a favorite among whitetail hunters
- ✗Narrow 6.3-degree field of view (335 ft) is the single biggest owner complaint - birders describe a 'tunnel vision' feel versus the M7 or P7
- ✗The tight FOV makes finding and following warblers in canopy genuinely harder for beginners
- ✗Rolling-ball distortion when panning bothers a minority of sensitive users - a few report mild nausea while scanning
- ✗Edges of the field go soft, so the excellent center sharpness doesn't extend far
- ✗Some chromatic aberration still visible in harsh bright-light conditions despite the ED glass
- ✗At $250 it faces brutal competition - the Monarch M7's much wider field costs only modestly more
- ✗Included case and strap are serviceable but underwhelming for the price tier
- ✗A few owners report sample variation in fine-focus snap - worth testing your unit critically on distant detail
Nikon Monarch M5 10x42
- ✓ED glass at a mid-$200s price delivers the clean, fringe-free image that separates it from the Prostaff tier - forum testers who ran it against the Prostaff P7 and Vortex Diamondback HD gave the M5 the overall edge-to-edge sharpness win
- ✓Excellent 18.4mm eye relief for a 10x42 - reviewers call it out as genuinely eyeglass-friendly, where most 10x competitors force glasses wearers to compromise
- ✓Owners consistently describe the image as clear, sharp, and true to color - the classic Monarch signature that made this line a best-seller
- ✓Dielectric prism coatings and fully multi-coated optics keep the view bright for a 42mm - side-by-side testers found it brighter than the Vortex Diamondback HD
- ✓Noticeably nicer build than the Prostaff P7 - a forum tester specifically contrasted the M5's solid eyepieces with the P7's rattly ones
- ✓Reasonably light for the class at 22.6 ounces, with a trim body that reviewers say handles closer to a mid-size than a full-size
- ✓Locking diopter holds settings through hard field use
- ✓Owner reviews frequently note it delivers close to Monarch M7 performance for meaningfully less money - the 'sensible Monarch' pick
- ✗The narrow field of view is the complaint that shows up in nearly every review - 293 ft at 1000 yards creates what testers describe as a tunnel-vision feel that makes finding and following birds harder
- ✗The Vortex Diamondback HD 10x42 offers a substantially wider window for less money, which reviewers repeatedly cite as the M5's most awkward comparison
- ✗Focus wheel gets mixed reports - some testers found it needs constant positive pressure to keep moving rather than gliding, though others call it smooth and fast
- ✗The 4.2mm exit pupil dims earlier at dusk than an 8x42 - a real consideration for hunters who need the last minutes of light
- ✗Handheld shake at 10x is amplified by the light body - some users find they need to brace more than expected
- ✗Nikon's limited lifetime warranty is far more restrictive than Vortex's transferable no-fault VIP warranty on similarly priced glass
- ✗Close focus of 8.2 feet is fine for feeder birds, the same as the Monarch M7, but too long for butterflies
- ✗Dedicated birders on forums keep concluding the M5 isn't for them - the field of view issue pushes them to the M7 or wider rivals despite the M5's sharpness
Nikon Monarch M5 8x42 vs Nikon Monarch M5 10x42: common questions
Is the Nikon Monarch M5 10x42's field of view narrower than the 8x42's?▾
Yes. The 10x42 shows 293 ft against the 8x42's 335 ft, and owners of both describe a tunnel-like view. If field of view already bothers you on the 8x42, the 10x42 will feel tighter still.
Which Nikon Monarch M5 is better at dawn and dusk, the 8x42 or 10x42?▾
The 8x42, with a 5.25mm exit pupil against 4.2mm. 10x42 owners note it dims earlier at dusk than an 8x42, while 8x42 owners praise its dawn and dusk performance, especially for whitetail hunting.
Is the Nikon Monarch M5 10x42 harder to hold steady than the 8x42?▾
Owners of the 10x42 say its light body amplifies hand shake, and some brace more than expected. With nearly the same weight as the 8x42, the 8x is noticeably steadier by hand.