12 x 70mm Cometron

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Want to see a comet? The Celestron Cometron 12x70mm binocular has you covered. Want to see the craters of the Moon, a distant nebula or star cluster? The Cometron 12x70mm is the binocular for you. Want to watch distant boats across the bay or eagles nesting along a riverbank? The powerful Celestron Cometron 12x70mm binocular can bring those distant sights to you. 

To easily reveal faint celestial objects, this Celestron Cometron has good-sized 70mm objective lenses, with a total light-gathering capacity nearly as large as a 4" rich-field telescope. This center focus Z-body porro prism Celestron uses high quality BaK-4 prisms for good light transmission. Its multi-coated optics showcase comets, the craters of the Moon, and even dim deep space objects in high contrast detail. 

The Cometron 12x70mm has a wide 4.6° field of view so you can scan broad stretches of the sky to quickly pinpoint the object you want to see, then keep it in your sights without the need for constant movement and readjustment. You can sweep the star clouds of Sagittarius, search out the Great Galaxy M31 in Andromeda and the Pinwheel Galaxy M33 in Triangulum, take in globular clusters like M13 and M22, open clusters like the Beehive and the Wild Duck, and much more.

Here on Earth, the 12x70mm Cometron lets you observe distant nature close-up and personal. Granted, with a close focus of 59’, this is not a binocular for observing nearby nature. However, its bright 5.83mm exit pupil makes it a good and very economical choice for any twilight birding or nature study activity where close focus is not required – but bright images are essential.

Light rubber armor on the aluminum and polycarbonate binocular body provides a sure hold when dewing becomes a problem. The 12x70mm Cometron is water resistant, but not waterproof. A supplied separate tripod adapter lets you mount the Cometron 12x70mm on any convenient optional camera tripod (at 49.3 ounces, it is realistically too heavy to hand hold steadily enough for extended observing). The tripod adapter mounts on any standard 1/4”-20 thread DSLR or video tripod. 

Soft roll-down eyecups shield the unaided eye from stray light when rolled up and cushion eyeglass lenses when rolled down. Eye relief is specified at a very long 19.6mm. The eye relief of the Cometron 12x70mm is easily long enough to allow essentially unvignetted eyeglass use for those who must wear eyeglasses while observing. 

A continuously variable diopter ring on the right eyepiece allows you to match the Cometron optics precisely to your individual eyesight for a sharp image. With its long eye relief and included tripod adapter, the Cometron 12x70mm makes it easy to comfortably enjoy extended stargazing and nature observing sessions.

The Cometron 12x70 comes with a wide padded neck strap, an eyepiece rainguard, and a soft carrying case for portability and protection. To top it all off, the Cometron 12x70mm has a limited lifetime warranty, a remarkable bonus at its very reasonable price.

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).
Porro Prism
Field of view:
The field of view (FOV) is the amount of observable world one can see at any given moment.
4.6°
Field of view 1000 yards:
242'
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.
5.83mm
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.
33.99
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.
28.98
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.

19.6mm
Interpupillary Distance:
56-72mm
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
59'
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:
No
Weight:
The weight of this product.
49.3 oz.
Warranty:
Limited Lifetime
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  • Soft case with carry strap
  • Wide padded neck strap
  • Eyepiece rainguard
  • Objective lens covers
  • Tripod adapter
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12 x 70mm Cometron

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12 x 70mm Cometron
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Our Product #: COM1270
Manufacturer Product #: 71199
Price: $89.95  Ground shipping for this item is $8.95 - Click for more info
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MSRP: $114.95
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The sensibly-priced Celestron Cometron 12x70mm porro prism binocular can be your passport to the skies above . . . and nature's wonders here on earth.





. . . our 34th year