Description
Last update on August 18, 2022 // Source: Amazon API
Rifle Scope Product Details
Sightmark Citadel 1-10×24 CR1 Riflescope
The Citadel 1-10×24 CR1 riflescope (SM13138CR1) brings close- to mid-range shooters, hunters and LE to the next level. The Citadel 1-10×24 CR1 riflescope comes feature packed with a fully multi-coated lens and fine-etched, red-illuminated reticle with 11 brightness settings. The riflescope includes a second focal-plane CR1 reticle, great for close- to mid-range shooting and quick target acquisition. The Citadel 1-10×24 comes complete with capped low-profile turrets, MOA per click windage and elevation adjustments and BDC reticle calibrated for .223 55-grain ammunition. This riflescope is IP67-rated waterproof, shockproof and fogproof all while including a throw lever and flip-up caps.
Rifle Scope Product Features
Imported
CR1 Reticle with MOA click adjustments and a BDC reticle calibrated for .223 55 grain
Capped, low profile turrets
Second focal plane reticle
Red illuminated reticle
Single-piece, 30mm tube
Sightmark Citadel Riflescopes
Features
First-and-second focal plane reticle options
Shockproof, fog-proof and waterproof
Sunshade included (LR1 & LR2) Series
Single-piece 30mm tube
6:1 zoom ratio
Fully multi-coated optics
Single piece 30mm Tube
Aircraft grade aluminum and hand-anodized finish with Subdued logos
Sightmark Citadel 1-10×24 CR1 Riflescope
Situated on the high ground of close-to-long range optic performace, Citadel Riflescopes include affordable first-focal-plane, long-range capability and second-focal-plane tactical solutions. Citadel series optics are perfect for precision shooters, multi-gun competitors, hunters, and yes, most definitely, LEOs who demand and deserve peace of mind reliability.
Sightmark’s line of Citadel Riflescopes are designed to help professional, competitive and recreational shooters climb to the top of their game with impenetrable confidence and win the day with feature-rich, premium performing optics. All Sightmark Citadel riflescopes boast 30mm single-piece, aircraft-grade 6061-T6 aluminum tubes; premium, fully multi-coated glass; fine-etched, red-illuminated reticles; lens covers; throw levers; IP67 waterproof, dustproof, fogproof and shockproof reliability.
Parallax Correction
The Sightmark Citadel riflescope is equipped with a side focus dial that is used to eliminate parallax and finely focus the image. Parallax occurs when the image of the target does not focus at the same optical plane as the reticle inside the riflescope. When parallax is present, the reticle appears to move over the target when the shooter’s eye is not centered to the eyepiece. Adjusting the side focus dial properly will eliminate parallax.
Windage and Elevation Adjustments
The Sightmark Citadel riflescope has finger adjustable elevation and windage adjustments with audible clicks. The Citadel 1-10×24 has capped turrets, the turret covers must be unscrewed in order to make adjustments.
CR1 Reticle
The CR1 reticle is a second focal plane, minute of angle (MOA) reticle. This reticle is calibrated for 5.56×45 / .223 Rem. 55gr FMJ ammo. The reticle was designed for a 100 yard zero. At 6x magnification, the 1 MOA aiming dot is used to engage targets from 0 to 200 yards. The reticle consists of a circle dot design for quick target acquisition in close range engagements. At 1x magnification, the outer circle will cover approximately 15 inches of a target at 25 yards. This is nearly equivalent to shoulder width of IPSC targets. Below the aiming dot, holdovers can be used to determine range of IPSC targets and perform ballistic holdovers out to 600 yards. Finally, the main horizontal subtension is scaled in 5 MOA increments (at 6x) and can be used for leads for moving targets.
Diopter Adjustment
The Sightmark Citadel riflescope eyepiece is designed to rotate to adjust for diopter. Diopter is the measurement of the eye’s curvature. By rotating the eyepiece, the diopter is adjusted to properly match each person’s vision. If the reticle does not appear clear, crisp, nor sharp, rotate the eyepiece until the reticle becomes clear and sharp. This adjustment should stay the same unless the riflescope’s operator changes.
Citadel 1-6×24 Citadel 3-18×50 LR1 Citadel 3-18×50 LR2 Citadel 5-30×56 Citadel 1-10×24
Reticle Type CR1 LR1 LR2 LR2 CR1
Magnification 1-6 3-18 3-18 5-30 1-10
Objective Lens diameter 24 50 50 56 24
Eye relief (in/mm) 3.5 – 2.9 / 88.9- 73.66 4.6 – 3.7 / 116.8 – 94 4.6 – 3.7 / 116.8 – 94 4.9 – 3.7 / 124.5 – 94 3.7 – 3.1 / 110.3 – 10.8
Tube Diameter 30 30 30 30 30
Adjustment Value (one click =) 1/2 MOA 1/4 MOA .1 MRAD .1 MRAD 1/2 MOA
About the Sightmark Manufacturer
Sightmark is a premium manufacturer for long gun scopes, optics, mounts, and other components used for guns like rifles and long guns. They design and make their scopes, mounts, and related products working with building materials which are long lasting and durable. This includes the Sightmark Citadel 1-10×24 CR1 Riflescope by Sightmark. For more shooting products, visit their website.
What You Need to Know About Optics
Rifle scopes permit you to precisely aim a rifle at various targets by lining up your eye with the target over a range. They accomplish this through magnification using a set of lenses inside the scope. The scope’s positioning can be adjusted for consideration of many ecological considerations like wind and elevation increases or decreases to account for bullet drop.
The scope’s function is to help shooters understand exactly where the bullet will land based on the sight picture you are seeing with the scope as you align the scope’s crosshair or reticle with the intended target. The majority of modern rifle optics have about eleven parts which are located within and externally on the optic. These optic pieces include the rifle scope’s body, lenses, elevation turrets or dials, objective focus rings, and other elements. Learn about the eleven parts of rifle optics.
The Varieties of Rifle Scopes
Rifle scopes can be either “first focal plane” or “second focal plane” type of scopes. Deciding on the finest type of rifle glass is based around what type of shooting you plan to do.
About First Focal Plane Scopes
Focal plane scopes (FFP) include the reticle in front of the zoom lens. These types of scopes are helpful for:
- Quick acquisition, long distance types of shooting
- Shooting circumstances where calculations are small
- Experienced shooters who understand their target “hold over” and also “lead” equations for their long gun
- Shooters who don’t mind the reticle is enlarged and occupies more visual sight area than a SFP reticle
About Second Focal Plane Optics
Second focal plane optics (SFP) feature the reticle to the rear of the magnification lens. In the FFP example with the SFP scope, the 5x “zoom” 100 yard tick measurement would be 1/5th of the non “zoom” tick measurement.
- Far away types of shooting where shooters have more time to make ballistic computations
- Shooting where most shots take place within shorter ranges and distances
- Shooters who choose a clearer optic picture with less room taken up by the larger sized FFP reticle
Rifle Glass Zoom
The quantity of magnification a scope supplies is identified by the size, thickness, and curvatures of the lenses inside of the rifle scope. The zoom of the scope is the “power” of the scope.
Fixed Power Lens Rifle Optics
A single power rifle optic and scope comes with a magnification number designator like 4×32. This means the zoom power of the scope is 4x power while the objective lens is 32mm. The zoom of this type of scope can not adjust because it is a fixed power optic.
Adjustable Power Lens Rifle Scope Info
Variable power rifle scopes can be modified between magnified levels. The power change is handled using the power ring part of the scope near the rear of the scope by the eye bell.
The Power and Range of Optics
Here are some advised scope powers and the ranges where they may be efficiently used. Keep in mind that higher magnification scopes and optics will not be as practical as lower magnification level scopes due to the fact that excessive magnification can be a bad thing. The very same idea goes for extended distances where the shooter needs to have sufficient power to see where to best aim the rifle.
Rifle Optic Lens Coating
All modern rifle optic lenses are covered in special coatings. There are various types and qualities of finishes. When thinking about high end rifle targeting devices, Lens finishing can be a crucial aspect of defining the capability of the rifle. The glass lenses are among the most key components of the optic since they are what your eye looks through while sighting a rifle in on the target. The finishing on the lenses offers protection to the lens surface area and also assists with anti glare capabilities from excess sunrays and color presence.
HD Versus ED Lens Coatings
Some rifle glass suppliers also use “HD” or high-definition lense coatings that employ various processes, components, polarizations, and chemicals to enhance different color ranges and viewable definition through lenses. This high-definition coating is normally used with increased density glass which reduces light’s capability to refract by means of the lens glass. Some scope suppliers use “HD” to describe “ED” implying extra-low dispersion glass. ED deals with how certain colors are represented on the chroma spectrum and the chromatic difference or aberration which is similarly called color distortion or fringing. Chromatic aberration can be visible around things with hard outlines as light hits the object from specific angles.
Single Finishing Versus Multi-Coating for Optics
Different optic lenses can also have different coatings applied to them. All lenses usually have at least some type of treatment or finish applied to them prior to being used in a rifle scope or optic.
Single covered lenses have a treatment applied to them which is typically a protective and boosting multi-purpose treatment. This lens treatment can preserve the lens from scratches while lowering glare and other less useful things experienced in the shooting environment while sighting in with the scope. The quality of a single layered lens depends on the scope developer and the amount you spent for it. Both the manufacturer and amount are indications of the lens quality.
Some scope producers also make it a point to define if their optic lenses are layered or “multi” coated. This suggests the lens has had several treatments applied to the surfaces. If a lens gets several treatments, it can establish that a company is taking multiple actions to fight various natural aspects like an anti-glare coating, a scratch resistant anti-abrasion finish, followed by a hydrophilic coating. This additionally does not always suggest the multi-coated lens will perform better than a single covered lens. Being “much better” depends on the producer’s lens treatment solutions and the quality of materials used in constructing the rifle optic.
Hydrophobic Lens Covering
Water on a scope’s lens doesn’t help with preserving a clear sight picture through a scope in any way. Many top of the line and premium optic producers will coat their lenses with a hydrophilic or hydrophobic covering. The Steiner Optics Nano-Protection is a good example of this sort of treatment. It treats the exterior of the Steiner scope lens so the H2O particles can not bind to it or create surface tension. The outcome is that the water beads move off of the scope to maintain a clear, water free sight picture.
Glass Installation Alternatives
Mounting approaches for scopes can be found in a couple of options. There are the standard scope rings which are separately installed to the scope and one-piece scope mounts which cradle the scope. These different kinds of mounts also normally are made in quick release versions which use manual levers which allow rifle shooters to quickly mount and remove the glass.
Rifle Glass Mounting Solutions with Hex Key Rings
Normal, clamp style mounting scope rings use hex head screws to mount to the flattop design Picatinny scope mount rails on rifles. These types of scope mounts use a couple of different rings to support the optic, and are made from 7075 T6 billet aluminum which are developed for long range accuracy shooting. This type of scope mount is great for rifles which require a durable, rock solid mounting solution which will not move no matter how much the scope is moved or abuse the rifle takes.
Quick-Release Cantilever Rifle Scope Rings
These kinds of quick-release rifle scope mounts can be used to quickly connect and take off a scope from a rifle. If they all use a similar style mount, multiple scopes can often be switched out on the range. The quick detach mount style is CNC machined from anodized 6061 T6 aluminum and the mounting levers connect firmly to a flat top type Picatinny rail. This allows the scope to be sighted in while on the rifle, taken off of the rifle, and remounted back on the rifle while retaining precision. These kinds of mounts come in convenient for rifles which are transported a lot, to take off the glass from the rifle for protection, or for scopes which are employed in between numerous rifles. An example of this mount style is the 30mm mount designed by the Vortex Optics brand. It generally costs around $250 USD
Details on Rifle Optic Tube Sealing and Gas Purging
Wetness inside your rifle optic can ruin a day of shooting and your costly optic by bringing about fogging and producing residue inside of the scope tube. Many scopes avoid wetness from getting in the scope tube with a system of sealing O-rings which are waterproof.
Info Around Rifle Glass Tube Gas Purging
Another component of avoiding the accumulation of wetness inside of the rifle scope’s tube is filling the tube with a gas like nitrogen. Since this area is currently occupied by the gas, the optic is less affected by condition alterations and pressure distinctions from the outdoor environment which might potentially enable water vapor to leak in around the seals to fill the vacuum which would otherwise exist. These are good qualities of a decent rifle scope to look for.
