Nikon Prostaff vs. Monarch Scope – Which Nikon Line of riflescopes are a better addition to your hunting gear?

Nikon Prostaff vs. Monarch Scope

Among the popular Nikon scopes are the Prostaff and the Monarch which slightly differ in terms of their optical performance. To help you pick out the best addition to your hunting gear, let us take a look at their top features and understand how they differ.

Whether you are a beginner hunter or a professional hunter, the Nikon Prostaff 5 and the Nikon Monarch 3 riflescopes have been designed to meet all your hunting requirements and satisfy your personal preferences. In this review, we will look at the Nikon Prostaff 2.5-10×40 Riflescope and compare it to the Nikon Monarch 2.5-10×42 riflescope to help you deduce which of the two is ideal for your hunting activities. The two riflescopes offer you with the same magnification range but we can notice a difference in their overall optical performance. The table below identifies their top features and outlines their differences.

What are the differences between the Nikon Prostaff and the Monarch Scopes?

Nikon Prostaff 2.5-10×40
Nikon Monarch 2.5-10×42
Recommended for
Short range/ Mid-range
Short range/ Mid-range/ Long range shooting
Product weight
433 grams
470 grams
Riflescope Dimensions


12.6 inches
12.6 inches
Turret Style
2.5 – 10x
2.5 – 10x
Objective Lens Diameter
40 mm
42 mm
Field of View
9.9 – 40.3 feet at 100 yards
10.1 – 40.4 feet at 100 yards
Eye Relief
4 inches
4 inches
Exit pupil diameter
4 – 16 mm
4.2 – 16.8 mm
Tube Size
1 inch
1 inch
Adjustment Graduation
1/4 MOA
1/4 MOA
Internal Adjustment

( Max)

70 MOA
70 MOA
Scope Parallax
100 yards
100 yards
Housing features
Nitrogen filled and sealed with O-rings
Nitrogen filled and sealed with O-rings
Weather Resistance levels
Waterproof and Fog proof
Waterproof and Fog proof

Nikon Prostaff vs. Monarch – How do they compare?

Construction Quality

The Nikon Monarch and the Nikon Prostaff scopes both have a magnification range of 2.5 – 10x which allows you to comfortably view refined details on distant subjects. A difference is noted in their objective lens diameter where the Nikon Monarch 3 scope has a 42mm objective lens which is bigger than the Nikon Prostaff 5 which has a 40mm objective lens. Ideally, the size of the objective lens determines the light collecting abilities of the riflescopes. So, with the Nikon Monarch 2.5-10×40 scope you are able to acquire brighter views when you are hunting during twilight hours.

Also, the Nikon Monarch 3 binoculars are heavier than the Nikon Prostaff 5 but they both have the same physical dimensions of 12.6 inches. If you are big about weight and trying to reduce the bulk in your hunting gear, you would be impressed by the portability of the Nikon Prostaff scope.

They are both waterproof and fog proof as they both have their optical tube Nitrogen filled and O-ring sealed. This allows you to comfortably and seamlessly use them both in unruly weather conditions and when you are moving through dynamic temperatures.

Optical Performance

The Nikon Monarch 3 scopes have a slightly wider field of view than the Nikon Prostaff 5 riflescope, which makes it easier for you to locate your target when you are hunting. The Nikon monarch and the Nikon Prostaff scopes have a similar optical performance when it comes to their parallax scope setting and their maximum internal adjustment.

They also have an identical eye relief of 4 inches which means that they are both comfortable to use with eye/sunglasses on. The difference in their optical performance is in their lenses where the Nikon Monarch scope is made with extra-low dispersion glass. With these optimized optics, the Nikon Monarch 3 scope provides you with a clearer, sharper and brighter view than the Nikon Prostaff 5 scope making them a better addition to your hunting gear.

Nikon Prostaff vs.Monarch – A Comparison Overview

Nikon Monarch 3 2.5-10×42 Review

The Nikon Monarch 3 provides you with a wide magnification range of 2.5-10x which makes them versatile enough for use in a variety of your shooting applications. It features a BDC reticle which ensures accuracy as you focus on your target. Its optical performance has been optimized to provide you with a bright and sharp picture with maximum light transmission at all times from dawn to dusk. Its optical system works with the Nikon Spot on Ballistic Match Technology which allows you to discover the exact aiming points on its BDC reticle for your exact load and ammunition.

It has positive click reticle adjustments which easily gets you zeroed in faster and maintains your focal setting even in the most rugged conditions. It has been made from a strong and durable aluminum alloy. It has large internal lenses and large tubes ensure maximum resolution, superior low light performance and wider elevation and windage travel. It is versatile enough for you to mount them on any rifle action regardless of their caliber and length. It features 4 inches of eye relief which is long enough to ensure your comfort when you are viewing with or without glasses. Its internal structure is filled with Nitrogen and sealed with O-rings which makes them fog proof and waterproof for use in all kinds of environments and weather conditions.


  • Superior light collecting abilities in twilight hours
  • Bright, clear and sharp images at all times
  • User friendly riflescope experience
  • Weatherproof and rugged design


  • Slightly heavier than the Nikon Prostaff 3 scope

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Nikon Prostaff 5 2.5-10×40 Review

The Nikon Prostaff 5 has been designed with an advanced optical system, a convenient fast-focus eyepiece and and-turn reticle adjustments with Zero-reset turrets that are spring loaded.  It has been fitted with a BDC reticle which makes it ideal for all your hunting escapades and makes it compatible with Nikon Spot on Ballistic Match Technology to ensure accurate aiming and target acquisition in all kinds of situations. It features fully multicoated optics which ensure increased light transmission even if you are hunting in low light environments.

It has a long eye relief design which ensures your comfort during hours of observation when you are about to shoot your target, even when you are wearing glasses. They have anti-reflective multilayer coatings on their lenses to provide you with bright and clear images without glare. It allows you to make reticle adjustments in ¼ MOA click stops which reduces backlash that could creep off your target. Its internal structure is Nitrogen filled and O-ring sealed to ensure weatherproof performance when you are moving across dynamic temperatures and wet weather conditions.


  • Waterproof, Fog proof and Shockproof
  • Fast focus eyepiece
  • Compact and lightweight
  • Decent optical performance


  • Middling long-range shooting performance

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The Nikon Monarch and Prostaff scopes are ideal for short and mid-range shooting. The Nikon Monarch is also an added advantage to your hunting gear as it is versatile enough to accommodate long-range shooting as well.

Final Verdict: So, which is better, the Nikon Prostaff or the Nikon Monarch Scopes?

The Nikon Monarch 3 is a better scope than the Nikon Prostaff 5. It provides you with a wide field of view, a comfortable eye relief, aiming accuracy and bright views at all times.


Can I use the Nikon Monarch 3 riflescope with glasses on?

Yes, you can. The Nikon Monarch 3 riflescope has a long and comfortable eye relief of 4 inches which ensures your comfort when you are viewing with or without glasses on.

Is the Nikon Monarch 3 riflescope ideal for long range shooting to 600 yards?

Yes, it is. The Nikon Monarch 3 riflescope works well for short, mid and long range shooting applications.


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