Top 20 Best Nikon Monarch 3X9X40 Reviews & Comparison [Ultimate Guide]

The future of the best nikon monarch 3x9x40 is here, and we’ve got all the best picks for 2024. We have compiled 21895 reviews from top experts that led us to these 20 devices on the list.

The Best Nikon Monarch 3X9X40 Deals This Week: 

Bestseller No. 1
Monstrum Rubberized Flip-Up Rifle Scope Lens Cover Set
  • Rubberized flip-up rifle scope lens covers that conform tightly around your rifle scope tube, protecting your lenses from dust and abrasion
  • Spring-loaded flip-up mechanism pops open effortlessly when needed and securely tightly when not in use
  • Each set includes two Rubberized Flip-Up Lens Covers. This set include one eyepiece cover with the size 37-43mm/1.5-1.7in and one objective cover with the size 31-37mm/1.2-1.4in
  • For optimum fit, carefully measure the OUTSIDE DIAMETER of both your rifle scope’s eyepiece and objective bell. Please note that this measurement is different than the diameter of your objective lens
  • Available in a full range of sizes to fit any rifle scope. Eyepiece Cover available in 37-43 mm(1.5-1.7 inch) or 43-49 mm(1.7-1.9 inch diameter). Objective Lens Cover available in 26-31 mm(1.0-1.2 inch), 31-37 mm(1.2-1.4 inch), 37-43 mm(1.5-1.7 inch), 43-49 mm(1.7-1.9 inch), 49-55 mm(1.9-2.1 inch), or 55-62 mm(2.2-2.4 inch) diameter
Bestseller No. 2
Low Profile Flip-Up Rifle Scope Lens Cover (54mm)
  • The lens cover folds flat horizontally to the scope body
  • Spring-loaded lens covers quickly deploys open with a simple press
  • Provides a good dust seal for the optics.
  • Can be mounted onto scopes, round reflex optics, binoculars, spotting scopes, or any optic with a round profile.
SaleBestseller No. 3
Vortex Optics Defender Riflescope Flip Cap - 40mm Objective Lens Cover (O-40)
  • Virtually indestructible, the Defender is the most versatile and durable flip cap on the market, this is the last flip cap you'll ever need.
  • A stainless steel spring flips the cap into multiple stop positions at 45 and 90 degrees.
  • Outside diameter: 45.5-48.5 mm | 1.8-1.9 inches
  • Objective-40 Fits: RZR-1589, RZR-1572, RZR-1565, RZR-1558, DBK-10025, DBK-10023, DBK-04-BDC, DBK-M-01P, DBK-01-BDC, DBK-M-04P, CF2-31005, CF2-31007, CF2-310017, CF2-310019, CF2-310025
  • Made in the USA.
Bestseller No. 4
Monstrum Rubberized Flip-Up Rifle Scope Lens Covers (Objective Lens | 55-62 mm/2.2-2.4 inch diameter | Flat Dark Earth)
  • Rubberized flip-up rifle scope lens covers that conform tightly around your rifle scope tube, protecting your lenses from dust and abrasion
  • Spring-loaded flip-up mechanism pops open effortlessly when needed and securely tightly when not in use
  • Each package includes one Rubberized Flip-Up Lens Cover
  • For optimum fit, carefully measure the OUTSIDE DIAMETER of both your rifle scope’s eyepiece and objective bell. Please note that this measurement is different than the diameter of your objective lens.
  • Available in a full range of sizes to fit any rifle scope. Eyepiece Cover available in 37-43 mm(1.5-1.7 inch) or 43-49 mm(1.7-1.9 inch diameter). Objective Lens Cover available in 26-31 mm(1.0-1.2 inch), 31-37 mm(1.2-1.4 inch), 37-43 mm(1.5-1.7 inch), 43-49 mm(1.7-1.9 inch), 49-55 mm(1.9-2.1 inch), or 55-62 mm(2.2-2.4 inch) diameter.
Bestseller No. 5
Monstrum Rubberized Flip-Up Rifle Scope Lens Covers (Eyepiece | 37-42 mm/1.5-1.7 inch diameter)
  • Rubberized flip-up rifle scope lens covers that conform tightly around your rifle scope tube, protecting your lenses from dust and abrasion
  • IMPORTANT: Sizing is not based on the objective lens size of your scope - a 3-9x40mm scope will not fit with a 40mm sized lens cover. For the correct fitting lens cover, you must physically measure the outside diameter of your scope eyepiece and objective.
  • Each package includes one Rubberized Flip-Up Lens Cover
  • Spring-loaded flip-up mechanism pops open effortlessly when needed and securely tightly when not in use
  • Please refer to sizing chart and sizing video, carefully measuring the OUTSIDE diameter of your scope, to ensure the proper size and fit.
SaleBestseller No. 6
Monstrum Flip Up Scope Lens Cover with Honeycomb Anti Reflection Device | 37-43 mm diameter
  • Flip up rifle scope lens covers keep your glass free from dust and scratches
  • Equipped with an attachable honeycomb anti-reflection device that deflects glare from your front lens, helping you conceal your position
  • Available in multiple diameters, with a flexible rubberized sleeve that conforms tightly around your rifle scope tube, allowing for compatibility with any scope from 37 to 61 mm in diameter
  • Before purchase, measure the OUTSIDE DIAMETER of your rifle scope’s objective bell - the front end of your scope. Note that this measurement is different than the diameter of your objective lens.
  • Each package includes one Flip-Up Lens Cover with one Honeycomb Anti Reflection Device. Flip-Up Lens Cover for your scope eyepiece must be purchased separately.
SaleBestseller No. 7
Nikon Monarch M7 10x42 Binocular Bundle with Harness and Nikon Lens Pen (3 Items)
  • Bundle Includes: Nikon Monarch M7 10x42 Binocular with Binocular Harness and Lenspen Cleaning System
  • Magnification and Objective: Compact Monarch M7 10x42 binoculars provide 10x magnification and 42mm objectives (front lenses) for maximum reach, lighter weight and greater portability
  • Wide Field of View: With an astoundingly wide field of view up to 362-ft at 1000 yards, you can see more details and more of the scene
  • Locking Diopter: With the locking diopter feature, you only need to adjust the eyecups for your vision (with or without glasses) and lock the setting in
  • Lightweight: At just 24 ounces, it has a compact and lightweight design that allows you to carry it easily on any adventure
SaleBestseller No. 8
Nikon Monarch M5 8x42 Binocular | Waterproof, fogproof, Rubber-Armored Binocular with ED Glass, Long Eye Relief, Limited Official Nikon USA Model
  • Sophisticated rubber armored exterior design provides shock resistance and a firm comfortable grip
  • Locking diopter control maintains your personal setting
  • Flip-down objective lens covers
  • Nikon’s Legendary ED (Extra-low Dispersion)Glass Lenses
  • Waterproof (up to 1m/3.3ft for 10 minutes) and nitrogen-purged for fog-free performance
SaleBestseller No. 9
Nikon Monarch M7 10x42 Binocular | Waterproof, fogproof, Rubber-Armored Full-Size Binocular with ED Glass & Wide View, Locking Diopter, Limited Official Nikon USA Model
  • Sophisticated rubber armored exterior design provides shock resistance and a firm comfortable grip
  • Locking diopter control maintains your personal setting
  • Oil/Water repellent coating - applied to both eyepiece and objective lens surfaces
  • Nikon’s Legendary ED (Extra-low Dispersion)Glass Lenses
  • Waterproof (up to 1m/3.3ft for 10 minutes) and nitrogen-purged for fog-free performance
SaleBestseller No. 10
Nikon Monarch M5 8x42 Binocular Bundle with Nikon Lens Pen and Binocular Harness (3 Items)
  • Bundle Includes: Nikon Monarch M5 8x42 Binocular with Binocular Harness and Nikon Lenspen Cleaning System
  • Wide Field of View: With an astoundingly wide field of view up to 335-feet at 1000 yards, you can see more details and more of the scene
  • Design: The roof prisms on Monarch M5 binoculars have a phase-corrected coating applied to prism surfaces for high resolutions
  • Adjustable Eyecups: The turn and slide rubber eyecups are adjustable, so you can place them right where you want them
  • Lightweight: At just 22 ounces, it has a compact and lightweight design that allows you to carry it easily on any adventure

Bottom Line about Nikon Monarch 3X9X40

When you purchase nikon monarch 3x9x40, it’s important to consider whether or not the item will actually serve its purpose. Sometimes we may think that an acquisition is necessary when really there are other options available at a lower cost, which would suffice just as well with no loss in value–reviewing these alternatives beforehand can help avoid wasting money on unnecessary purchases later down the line. 

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