10x50mm Granite ED

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This Celestron 10 x 50mm Granite ED roof prism binocular is designed for those who want more light-gathering and higher resolution than a 10-power 42mm binocular can provide, but don’t want to pay a high price or big weight penalty to get that added performance. The reasonably-priced 30 ounce Celestron 10x50mm Granite is O-ring sealed and nitrogen purged to shrug off unexpected summer showers and full downpours. It uses costly ED glass in its objective lenses (a rarity in this price range), top quality BaK-4 roof prisms, and phase-corrected multicoated ED glass optics for good high contrast images with excellent color fidelity. 

The 10 x 50mm Granite’s field is commendably flat, with images staying in focus from one side of the image to the other. Barrel distortion, the curving of straight lines at the edge of the field, is very modest and well controlled. There is a minuscule amount of chromatic aberration at the very edges of the field, but it is unnoticeable during most observing.
 
With its 50mm objective lenses providing 42% more light and 19% higher resolution than a 42mm binocular, and its multicoated phase-corrected ED glass optics providing high contrast/high color fidelity images, this 10 x 50mm Celestron Granite binocular can give you the performance edge you’re looking for. Whether you are birding in the fields, woods, or along the shoreline, or are out under the night sky hunting for star clusters, nebulas, and galaxies, this Celestron Granite ED binocular is bound to please.

Features of this binocular . . . 

•  Roof prism optics. Open bridge H-body roof prism design with internal center focus. High quality BaK-4 prisms for unrestricted light transmission. 
•  ED glass. ED (Extra-low Dispersion) glass is used in the objective lenses to deliver excellent edge-to-edge sharpness and color correction, while essentially eliminating chromatic aberration for crisp images free from unnatural color fringing. The eco-friendly glasses used throughout this Celestron Granite binocular are lead and arsenic free. 
•  Broadband multicoated optics. Fully multicoated on all air to glass optical surfaces with multiple layers of ion-deposited broadband antireflection materials for very high light transmission and contrast. With a 5mm exit pupil and 50mm objective lenses, the 10 x 50mm Granite is a bright binocular in twilight or low light situations. 
•  Phase-coated high transmission prisms. The image-erecting roof prisms are made of high quality BaK-4 glass. The premium grade prisms allow for sharp images, while high transmission multicoatings increase the light throughput to provide the brightest possible images. In addition, special phase-correcting dielectric multicoatings are applied to the roof prisms for peak contrast, color fidelity, and resolution. The resulting improvement is easily seen when looking for color and detail in the shadowed areas of a silhouetted or backlit bird. 
•  Open bridge magnesium alloy body. The open bridge body design allows the fingers of your hands to wrap naturally around the binocular body for a secure grip in all weather conditions, even when using a single-hand grip. The body is made of magnesium alloy, which is both lighter than aluminum and more rugged to absorb accidental abuse without flinching. 
•  Waterproof and fogproof. Dry nitrogen filled and O-ring sealed to be waterproof and fogproof in all temperature and climate extremes. Designed to operate reliably in rain forests and deserts alike. 
•  Armor. Black rubber armor absorbs noise and the bumps and thumps of everyday use and provides a good grip when wet. Thumb recesses and ridges where your fingers naturally fall assure a secure grip. 
•  Wide field. The field of view is a wide 6.5° (342’ at 1000 yards), quite good for a 10x binocular. 
•  Twist-up eyecups and good eye relief. The eyecups (metal for long life, not flimsy plastic) are rubber-rimmed for comfort. They twist up to block ambient light and increase contrast for those who don’t wear glasses. They retract for eyeglass or sunglass use. Click stops provide three distinct eyecup heights to let you match the individual eyecup height to your eyes. Eye relief is specified at 17mm, although it typically measures a mm or two less due to the recessed position of the eye lens (from where the eye relief is typically measured). This provides virtually unvignetted viewing for sunglass wearers or those who must wear eyeglasses when observing. 
•  Eyepiece rainguard and lens covers. A rubber eyepiece rainguard is standard equipment, to keep eyepieces dry in sudden showers. It can be attached to the binocular neckstrap to hang down out of the way to one side when not in use, without danger of its getting lost. Tethered objective lens covers protect the optics during travel or storage. They flip off the optics and hang down under the binocular tubes to stay out of the way when not in use, but can be removed completely if so desired. 
•  Close focusing. A little under one and three-quarter turns of the large focusing knob moves from a very good near focus of 9.8’ out to the horizon and beyond. Shallow rubber ribs inset into the metal focus knob make it easy to turn the focus knob, regardless of the weather. A 9.8’ close focus is quite useful for woodland birding. 
•  Rotary diopter correction. A continuously variable rubber-ribbed metal diopter ring on the right eyepiece allows you to match the binocular optics precisely to your individual eyesight for a sharp image. 
•  Tripod adaptable. For extended no-hands observing, a protective cover on the front bridge unscrews, revealing a 1/4"-20 thread hole for mounting the Celestron 10 x 50mm Granite on an optional photo tripod using an optional tripod adapter #1187. 
•  Standard accessories. A one and a half inch wide neoprene-padded neck strap for comfortable all-day use and a water-shedding lightly padded Cordura-style nylon and vinyl carrying case with a wide woven shoulder strap are standard equipment. 
•  Free binocular harness. An unexpected but welcome no-charge bonus is a binocular harness that permits no-hands carrying of the binocular, in addition to taking the strain off your neck by distributing the weight of the binoculars to your shoulders and torso. 
 

Optical Type:
The optical design of a binocular or spotting scope. A binocular can be either a porro prism (whose objective lenses are off-set and spaced further apart than the eyepieces) or a roof prism (whose objective lenses are in line with the eyepieces). A spotting scope can be either a porro prism or roof prism refractor or a catadioptric (a combination of lenses, mirrors, and prisms).
Roof Prism
Field of view:
The field of view (FOV) is the amount of observable world one can see at any given moment.
6.5°
Field of view 1000 yards:
342'
Exit Pupil:
The circular image or beam of light formed by the eyepiece of a telescope. To take full advantage of a scope's light-gathering capacity, the diameter of an eyepiece exit pupil should be no larger than the 7mm diameter of your eye's dark-adapted pupil, so that all of the light collected by the telescope enters your eye. (The eyepiece exit pupil diameter is found by dividing the eyepiece focal length by the telescope focal ratio.) Your eye's ability to dilate declines with increasing age (to a dark-adapted pupil of about 5mm by age 50 or so). For those in this age group, eyepieces with exit pupils larger than their eyes can dilate to simply waste their telescope's light-gathering capacity, as some of the scope's light will fall on their iris instead of entering their eye.
5mm
Relative Brightness:
A number used to compare the brightness of binoculars or spotting scopes of similar magnification. The relative brightness is determined by squaring the diameter of the exit pupil. The larger the relative brightness number, the brighter the image.
25
Twilight Factor:
A number used to compare the effectiveness of binoculars or spotting scopes used in low light. The twilight factor is found by multiplying the size of the objective lens (in mm) by the magnification and then finding the square root of that result. The larger the twilight factor, the more detail you can see in low light. A twilight factor of 17 or better if usually required for reasonable low light use.
22.36
Eye Relief:
Eye relief is the distance from the last surface of the eye lens of an eyepiece to the plane behind the eyepiece where all the light rays of the exit pupil come to a focus and the circular image is formed, sometimes called the “Ramsden Disk.” This is where your eye should be positioned to see the full field of view of the eyepiece. If you must wear glasses because of astigmatism, you’ll usually need at least 15mm of eye relief or longer if you want to see the full field of view with your glasses on.

A note on our eye relief figures: Quite often, our eye relief figures will differ from those of the manufacturer. This is because we measure the “usable” eye relief, while the manufacturers specify their usually-longer (but technically correct) “designed” eye relief.

The eye lens of the eyepiece is normally recessed below the rubber eyeguard or rubber rim of the eyepiece to keep the lens from being scratched during use. An eyepiece might have a “designed” eye relief of 15mm (and the eye relief will truly measure 15mm from the eye lens to where the image forms). However, if the eye lens is recessed 3mm below the eye guard, the Ramsden Disk forms only 12mm above the eyepiece body (the 15mm “designed” eye relief, less the 3mm of eye relief made unusable by having the eye lens recessed into the body of the eyepiece). This “usable” eye relief of 12mm (measured from the rolled-down eyeguard – the closest point you can get your eye to the eye lens – to where the image forms) is the eye relief figure we would measure and list in this website.

Why is it important to list the “usable” eye relief? For those people who don’t wear eyeglasses while observing, a few mm difference between the eye relief they expect from the manufacturer’s literature and the shorter eye relief they actually get in real life doesn’t mean a lot. They can simply move a little closer to the eyepiece to see the full field, and never realize that the eye relief is a little shorter than they expected. However, some people must wear eyeglasses while observing, because of severe astigmatism. These observers can’t move closer to the eyepiece if the eye relief is shorter than expected because their glasses get in the way. For these people, the real life “usable” eye relief is more important than the technically correct but sometimes not fully usable “designed” eye relief. We measure and list the actual usable eye relief so that people in the real world can pick the eyepieces that will work best for them.

17mm
Interpupillary Distance:
56-73mm
Close Focus:
How close you can get to an object and still see a sharp image of it in your binocular or spotting scope is called the “close” or “near” focus
9.8'
Height:
6.5"
Armored:
A binocular or spotting scope whose body is clad in rubber or polyurethane armor is said to be armored. Armor can be applied for looks, a better grip, noise-proofing, etc. An armored body does not guarantee that a binocular or spotting scope is waterproof, although most waterproof optics are armored.
Yes
Waterproof:
Yes
Weight:
The weight of this product.
30 oz.
Warranty:
Limited Lifetime
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  • Soft case
  • Woven case strap
  • Wide neoprene-padded neck strap
  • Shoulder harness
  • Objective lens covers
  • Eyepiece rainguard  
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    10x50mm Granite ED

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    10x50mm Granite ED
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    Our Product #: C1050GR
    Manufacturer Product #: 71374
    Price: $449.95  FREE ground shipping - Click for more info
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    The fully-multicoated 50mm objective lenses of the Celestron 10 x 50mm Granite ED binocular gather 42% more light than a 10 x 42mm binocular to provide brighter and more detailed terrestrial and astronomical images while still being easy to hand hold . . .





    . . . our 34th year