Nikon binoculars decoded: ProStaff, Monarch, and which rung to buy

By the OpticVerdict Editorial Team.
Research-based roundup · Updated 2026-08-19

Nikon sells binoculars under two family names and has renamed the cheaper family twice, which is why so many buyers arrive looking for a model that no longer exists. The useful question is not which Nikon is best but where the real dividing lines sit, because they are not where the price breaks are. Below is the succession map, the coating ladder in Nikon's own words, what an independent laboratory measured, and the three models worth your money.

How these picks were made: a research-based roundup built from Nikon's own published specifications and press releases, independent laboratory measurements, verified owner reviews, and live pricing and stock read from the OpticsPlanet product pages. This range has an unusually thin owner-review record, so the evidence here leans on the manufacturer's specification record and measured lab data rather than owner consensus, and we say so wherever it matters. Scores are our editorial opinion, not a hands-on test of every model. See how we evaluate.

What replaced the ProStaff 3S, 7S, 5 and 7

If you are searching for a ProStaff 3S, a 7S, a ProStaff 5 or a ProStaff 7, you are searching for a discontinued product. On June 9, 2022 Nikon replaced the entry-level range with two models. Its press release is unambiguous: the new ProStaff P3 binoculars are described as the successors of the popular ProStaff 3S series, and the P7 as improving upon the previous ProStaff 7S models.

The practical consequence: a used 3S or 7S is not a bargain version of a current model, it is a three-generation-old design with no warranty path. The P3 and P7 are the models to compare against, and the P7 in particular is not a like-for-like reissue of the 7S but a differently specified instrument.

The coating ladder: what each step actually buys

Nikon's range looks like a price ladder and behaves like a coating ladder. Two treatments decide how much detail a roof-prism binocular can actually resolve, and they arrive at specific rungs.

Phase-correction coating is the one that matters most and the one buyers have never heard of. Any roof prism splits the light passing through it into two polarised components. Those components fall out of step, and when they recombine they interfere destructively, which smears fine detail and flattens contrast. A phase-correction coating puts them back in step. Its absence does not merely dim the image, it costs resolution.

A dielectric prism coating is the second. Where a roof prism cannot reflect light purely by total internal reflection, the face has to be mirrored. A silver-alloy mirror returns most of the light; a dielectric stack of alternating high and low refractive index layers returns more of it.

Here is where each treatment appears, in Nikon's own specification wording rather than ours.

Read that table once and the range stops being confusing. The P3 to P7 step buys corrected optics. The P7 to Monarch step buys ED glass. The M5 to M7 step buys field of view and a repellent lens coating, not better glass, since both use the same coatings and the same ED elements. The HG step buys flat-field geometry, and it is the only step whose benefit has been independently measured.

Quick comparison

Best value in the Nikon line: Nikon ProStaff P7 10x30mm Roof Prism Binocular

4.4/5 our editorial score

5.0/5 from 1 verified rating on OpticsPlanet (a thin record, see below)

10x · 30mm · roof prism · dielectric high-reflective prism coating · phase-correction coating · locking diopter · oil and water repellent lens coating · 470 g · waterproof to 1 m for 10 minutes

around $220 exact price on OpticsPlanet

Check price on OpticsPlanet

This is the cheapest Nikon binocular that is optically complete, and that sentence is doing real work. Two coatings separate a binocular that merely passes light from one that resolves detail properly, and the P7 is the first rung that has both. Nikon's own press release lists a dielectric high-reflective prism coating and a phase-correction coating for the P7; for the P3 it lists a silver-alloy mirror coating and no phase correction at all. Phase correction is not a marketing layer. A roof prism splits light into two polarised components that fall out of step and interfere destructively when they recombine, smearing fine detail and flattening contrast; the coating puts them back in step. Everything above this rung has it, nothing below it does. You also get the mechanical upgrades that separate a field instrument from a starter pair: a locking diopter ring that will not drift when you pull the binocular out of a pack, and an oil and water repellent coating on both lens surfaces so you can wipe a smeared objective without grinding grit into the anti-reflective layers. The trade-off is aperture, and it is a real one. This is a 30mm objective, so at 10x the exit pupil is 3.0 mm, narrower than a dilated eye at dusk. Buy it knowing that.

Pros

• The cheapest rung with both coatings that matter: Nikon lists a dielectric prism coating and a phase-correction coating here, and lists neither for the ProStaff P3 below it
• A locking diopter ring rather than the P3's friction ring, which means your focus setting survives being pulled in and out of a pack or harness
• Oil and water repellent coating on the objective and eyepiece lenses, so wiping a wet or smudged lens does not risk the coatings under it
• Light for what it is at 470 g, and the one verified owner reports it holds its own against his own 10x42 at dusk, reading street sign letters clearly at about 150 yards

Cons

• The 30mm objective is the real compromise: at 10x the exit pupil is 3.0 mm against 4.2 mm for a 10x42, and a dilated eye at dusk opens well past that, so it cannot fill your pupil in the last minutes of light
• Its sole owner review names "not the best sight picture" as his own con, which is consistent with a small objective at 10x rather than a defect
• Eye relief drops to 15.4 mm, the shortest of any model on this page and noticeably less forgiving than the 20.2 mm on the cheaper P3, which matters if you wear glasses
• The owner record is one review deep, so the 5.0 rating is a data point rather than a consensus, and there is no independent laboratory measurement published for any ProStaff model

Best for: the hiker, traveller or general daylight glasser who wants genuinely corrected optics in a small package and does not need the last twenty minutes of light. If you wear glasses or glass at dawn and dusk, the 42mm ProStaff P3 below is the more comfortable instrument despite being optically simpler.

Key specifications

Manufacturer	Nikon
Magnification	10x
Objective lens	30 mm
Prism	Roof
Prism coatings	Dielectric high-reflective multilayer + phase-correction
Eye relief	15.4 mm (Nikon)
Exit pupil	3.0 mm
Close focus	2.5 m (Nikon)
Field of view	346 ft at 1000 yds
Weight	470 g (Nikon), 16.6 oz
Diopter	Locking
Sealing	Waterproof to 1 m for 10 minutes, nitrogen purged
Body	Fibreglass-reinforced polycarbonate resin
MPN carded	16771 (single offer, no demo variant)

“I compared them at dusk with my 10 x 42 binoculars and there was not much difference at all in what I could see. I focused in on the street sign and the letters were just as clear at about 150 yards away. I wasn't looking to spend $300-$400 and I am very satisfied with this purchase.”

Toolman, verified owner (WI) via OpticsPlanet, the listing's only review

Best for glasses wearers on a budget: Nikon ProStaff P3 8x42mm Roof Prism Binocular

4.1/5 our editorial score

No ratings yet on OpticsPlanet: not one owner has reviewed this model

8x · 42mm · roof prism · multilayer-coated lenses · silver-alloy mirror prism coating · no phase-correction coating · 590 g · waterproof and fogproof

around $160 exact price on OpticsPlanet

Check price on OpticsPlanet

This is the direct replacement for the ProStaff 3S, the model most people are actually searching for, and Nikon says so in as many words: its 2022 press release calls the P3 "the successors of the popular PROSTAFF 3S series". What it is good at is comfort. The 20.2 mm of eye relief Nikon publishes for it is the most generous figure on this page, more than the flagship Monarch HG offers, and with a 5.3 mm exit pupil and turn-and-slide eyecups it is the easiest model here to use with thick spectacles or sunglasses. What it gives up is the coating layer above it. Nikon lists a silver-alloy mirror coating on the prism faces and no phase-correction coating at all, and that is not a small omission: without phase correction the two polarised halves of the light path recombine out of step, which measurably reduces resolution and micro-contrast rather than just dimming the view. So this is a comfortable, honest daylight binocular, not a low-light or astronomy instrument. Two practical cautions before you order. It is on backorder at the time of writing, and its published weight is contested: Nikon says 590 g while OpticsPlanet's spec field says 16.8 oz, which is about 114 g lighter. We use Nikon's number.

Pros

• The most forgiving eye box on this page: Nikon publishes 20.2 mm of eye relief with a 5.3 mm exit pupil, which beats every Monarch here including the flagship, so glasses wearers see the full field
• It is the documented successor to the ProStaff 3S, which means the model most buyers are still searching for has a current, in-catalogue equivalent rather than a used-market gamble
• A 42mm objective at only 8x is the most light-efficient combination on this page, so within its coating class it makes the best use of what it gathers
• Genuinely cheap for a full-size waterproof 42mm from a major optical manufacturer, at a price where most competitors are house brands

Cons

• No phase-correction coating, which is the single biggest optical compromise on this page. Nikon lists the coating for the P7 and every Monarch, and does not list it here, and its absence costs resolution and contrast rather than only brightness
• The prism faces use a silver-alloy mirror coating rather than the dielectric coating used from the P7 upward, so it reflects less of the light that reaches the prism
• The diopter ring is friction-based with no lock, so it can drift out of adjustment when the binocular is pulled in and out of a pack
• On backorder at the time of writing, and the published weight is contested: Nikon says 590 g, the retailer's spec field says 16.8 oz. We have not been able to reconcile them, so treat the retailer figure with caution
• Zero owner reviews on the retailer listing, so there is no owner record to check our reading against

Best for: the beginner, backyard birder, hiker or spectacle wearer who glasses in daylight and wants the most comfortable view for the money. Skip it for astronomy or serious dusk hunting, where the missing phase-correction coating and the silver-alloy prism will show, and step to the P7 or a Monarch instead.

Key specifications

Manufacturer	Nikon
Magnification	8x
Objective lens	42 mm
Prism	Roof
Prism coatings	Silver-alloy mirror. No phase-correction coating listed
Lens coatings	Multilayer-coated (Nikon does not use the term "fully multicoated" here)
Eye relief	20.2 mm (Nikon)
Exit pupil	5.3 mm
Close focus	3.0 m (Nikon)
Field of view	456 ft at 1000 yds
Weight	590 g (Nikon). The retailer lists 16.8 oz, which conflicts
Diopter	Friction, non-locking
Replaces	ProStaff 3S (Nikon press release, June 9 2022)
Availability	Backorder at the time of writing
MPN carded	16776 (single offer, no demo variant)

Best Nikon binocular, measured: Nikon Monarch HG 10x42mm Roof Prism Binoculars

4.7/5 our editorial score

5.0/5 from 1 verified rating on OpticsPlanet (thin, but a detailed one)

10x · 42mm · BAK-4 roof prism · ED glass · Field Flattener Lens System · dielectric and phase-correction prism coatings · magnesium alloy body · 24 oz · waterproof to 16.4 ft for 10 minutes

around $1,100 exact price on OpticsPlanet

Check price on OpticsPlanet

This is the top of the ladder and the only Nikon binocular on this page whose optics have been measured by an independent laboratory rather than described by its manufacturer. AllBinos put it on a spectrophotometer and recorded 88.3 percent light transmission, then scored its distortion at a perfect 10 out of 10 with the first curved line pushed out to 92 percent of the field radius, and found edge blur only setting in at 84.5 percent of the way to the edge. Those two numbers are the Field Flattener Lens System doing exactly what Nikon claims for it, which is the rare case of a proprietary-sounding feature showing up in measured data. The same lab noted the binoculars are manufactured in Japan. Everything else on the ladder is here too: ED glass, fully multicoated optics, dielectric and phase-correction prism coatings, and a magnesium alloy body that keeps a 42mm at 24 oz. The one owner review is thin but unusually useful because he tests rather than admires, reading newspaper text at 50 yards for resolution and looking at a white fence in sun for chromatic aberration, and comparing against a Minox HG he has owned for twenty years. He rates the Nikon a touch brighter and then adds his own caveat, which we keep: perhaps there is better out there, but for the price he is satisfied. Two honest limits. The lab measured chromatic aberration at only 6.1 out of 10, medium to high at the extreme edge, despite the ED glass. And its transmission does not reach Nikon's advertised figure, which we cover in detail below.

Pros

• The only Nikon here with independent laboratory measurements behind it: 88.3 percent ± 1 percent light transmission on a spectrophotometer, not a manufacturer estimate
• Measured optical geometry is exceptional: distortion scored a perfect 10 out of 10 with the first curved line at 92 percent of the field radius, and edge blur only begins at 84.5 percent, which is the Field Flattener Lens System showing up in data
• Confirmed by the same laboratory as manufactured in Japan, the only rung on this ladder with a credible published assembly origin
• A magnesium alloy body keeps a full-size 42mm to 24 oz with a 6.6 ft close focus, the closest on this page, and it seals to 16.4 ft for 10 minutes

Cons

• It does not hit Nikon's advertised transmission. The manufacturer markets "up to 92 percent or higher"; the lab measured 88.3 percent on this model and 90.1 percent on the 8x30, and said in as many words that the promised 92 percent is not reached
• Chromatic aberration scored only 6.1 out of 10, slight in the centre but medium to high at the extreme edge, which is a modest result for a binocular built around ED glass
• At roughly seven times the price of the ProStaff P3, the measured gain over well-corrected mid-tier glass is real but incremental, and its own owner concedes there may be better out there
• The owner record is a single review, and stock was down to three units at the time of writing, so both social proof and availability are thin

Best for: the serious birder, hunter or long-session observer who wants edge-to-edge sharpness and is buying once. If the seven-times price step is the question rather than the glass, a Monarch M5 or M7 carries the same ED glass and the same phase and dielectric coatings for a third to a half of the money.

Key specifications

Manufacturer	Nikon
Magnification	10x
Objective lens	42 mm
Prism	BAK-4 roof
Prism coatings	Dielectric high-reflective multilayer + phase-correction
Lens material	ED glass with Field Flattener Lens System
Measured transmission	88.3% ± 1% (independent lab)
Eye relief	17 mm
Exit pupil	4.2 mm
Field of view	362 ft at 1000 yds
Close focus	6.6 ft
Weight	24 oz
Body	Magnesium alloy
Sealing	Waterproof to 16.4 ft for 10 min, nitrogen filled
Made in	Japan (independent lab observation)
MPN carded	16028 (single offer, no demo variant)

“My tests are to read the newspaper at 50 yards (resolution) and look at a white fence on a sunny day (chromatic aberration). I compare the Nikon HG to a pair of Minox HG 10x43 BR that I purchased 20 years ago, pretty close in performance, with the Nikon being just a tad brighter... Perhaps there is better out there but, for the price I am satisfied.”

snaffle, verified owner (CT) via OpticsPlanet

The 92% question, answered with lab data

Nikon markets the Monarch HG's dielectric coating as achieving up to 92 percent or higher light transmittance. That is the kind of number worth checking, because a manufacturer's transmission claim is a marketing statement until somebody puts the binocular on a spectrophotometer.

The independent optics laboratory AllBinos has done exactly that on two Monarch HG models. Its measured results:

The laboratory addressed the gap itself rather than leaving it to be inferred. Its verdict was that the binoculars do not reach the promised 92 percent, that at 600 nm you get a result near 91 percent, and that within the margin of error this is in accordance with the declared value. In other words the HG touches 91 percent at one specific orange-red wavelength while its transmission across the visible spectrum sits in the high eighties.

That is genuinely good glass and the claim is defensible at a single wavelength, but it is not 92 percent across the spectrum, and a buyer choosing between an HG and a European alpha binocular on that number deserves the measured figure rather than the advertised one. Note also what has not been measured: we found no published independent laboratory transmission data for any ProStaff model or for the Monarch M5 or M7, so nobody can tell you what those pass. Anyone who does is estimating.

The same laboratory's other measurements on the 10x42 are worth having, because they cut both ways: a perfect 10 out of 10 for distortion and edge blur held off until 84.5 percent of the field radius, which validates the Field Flattener Lens System, but only 6.1 out of 10 for chromatic aberration, medium to high at the extreme edge, in a binocular built around ED glass.

Every current Nikon binocular, priced

The three models above are the ones we card, but the ladder is wider than that. Where a rung is carded on this site, its price is re-read against the retailer on our normal schedule and shown as a band. Where it is not, we give a ceiling instead of a figure, because a price nothing on our side ever re-reads is a price that quietly goes stale. Every figure here was taken from the full offer list on the retailer's product page rather than the headline figure, which matters more than it sounds: on one of these listings the cheapest offer is a factory demo unit rather than the new model.

The Monarch M5 8x42 sits between these rungs and has its own full review, which carries its price and its stock on the same schedule as the carded figures above. We keep that figure in one place rather than repeating it here, because a number written twice is a number that can rot in one place and stay right in the other.

Where they are made

This question comes up in every Nikon binocular discussion and usually gets answered with more confidence than the evidence supports. Only two rungs can be answered credibly.

The Monarch HG is made in Japan. The independent laboratory that measured its transmission also physically inspected the unit and recorded that the Monarch HG series, like its predecessors, is manufactured in Japan. The ProStaff P3 is made in China, listed as the country of origin by multiple major retailers and printed on the packaging.

For the ProStaff P7, the Monarch M5 and the Monarch M7 we are not going to tell you, because we could not find a source worth quoting. Marketplace listings do claim origins for these lines, including one that describes a P7 as made in Japan, but a single third-party listing is not evidence, and a Japanese-built binocular at this price would be an anomaly. Older Monarch generations were built in China and in the Philippines, but we found no documentation for the current M5 and M7. If assembly country matters to your purchase, buy the rung where it is documented.

How to choose

• Buy the coating step, not the price step. The single biggest optical jump in this range is P3 to P7, a $60 difference, because that is where phase correction arrives. Nothing above it delivers as much improvement per dollar.
• Check eye relief before magnification if you wear glasses. The cheapest binocular here has the longest eye relief at 20.2 mm and the most expensive has 17 mm. Price does not track comfort in this range.
• Do not buy a 30mm for dawn and dusk. Exit pupil is objective divided by magnification: 3.0 mm on a 10x30 against 4.2 mm on a 10x42, both narrower than a dilated eye. The small objective gives up its ground exactly at the hours hunters care about.
• M5 to M7 is not a glass upgrade. Both use ED glass with the same prism coatings. You are paying for field of view and a repellent lens coating, which is worth it for birding and close to irrelevant for static glassing.
• Treat retailer spec fields as a lead, not a fact. The P3's weight is listed as 16.8 oz by the retailer and 590 g by Nikon, a difference of about 114 g. When the two disagree, the manufacturer wins.

Comparing across brands instead of within Nikon? Our best 8x42 binoculars and best binoculars for hunting rank the whole field, and Vortex Razor binoculars is the same kind of line decoder for Vortex's flagship range. Birding specifically? See best binoculars for birding. Carrying them all day calls for a binocular harness.

FAQ

Related: Nikon Monarch M5 8x42 review · Nikon Monarch M7 8x42 review · best 8x42 binoculars · Vortex Razor binoculars decoded.