20X50mm UpClose G2 porro prism

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This Celestron 20 x 50mm UpClose G2 is a surprisingly affordable very high power 20x magnification binocular that will put you right in the middle of the action. It has good-sized 50mm objective lenses that gather a lot of light for bright and clear images. This 20x UpClose G2 will get you up close and personal with sporting events, close to the scenery and wildlife on vacation trips or camping, and close up to anything that’s far away and likely to stay there. And it's light enough to let you use it for extended periods without arm strain.

The 20x50mm UpClose G2 has a 3.2° field of view (168’ at 1000 yards) and fast one-turn lock to lock focusing so you can keep fast-moving action sharply in view. It’s rubber armored for a comfortable grip and weather-resistant to shrug off the occasional summer shower (although it is not waterproof).

Its 50mm diameter fully coated BK7 optics gather substantial amounts of light, giving it a very high twilight factor of 31.62, making it a very useful performer in the low light of twilight or under overcast skies. The close focus is a not very close 42’, so it’s not suited for backyard birding or close-in observing. Usable eye relief is a short 7mm. There will be considerable vignetting for those who must wear eyeglasses while observing, so these are not recommended for eyeglass wearers. Overall, this is a surprisingly affordable, light weight, very high power binocular for those who want to get very close to the action without spending a fortune.

Features of this binocular . . .

  • Porro prism optics. Traditional porro prism design using BK7 prisms. Center focus.
  • Fully coated optics. The optics are treated on all air-to-glass surfaces with antireflection coatings for good light transmission.Critical optical surface are multicoated.
  • Weather resistant. Sealed to resist showers and inclement weather, although not designed to be fully waterproof and fogproof.
  • Armor. Black rubber armor absorbs noise and shock and provides a good grip when wet. Molded-in ridges for a secure and comfortable grip.
  • Roll-udown eyecups. The shallow rubber-rimmed eyecups roll down for eyeglass or sunglass use.
  • Close focusing. Focuses to 42’, making it unsuitable for close-in observing. This binocular is designed for long distance viewing exclusively.
  • Fast focusing. Little more than one turn of the large ribbed focus knob moves from the 42’ close focus out to the horizon so you can keep track of fast-moving action.
  • Rotary diopter correction. A variable 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 center hinge unscrews, revealing a 1/4”-20 thread hole for mounting the binocular on an optional photo tripod using an optional tripod adapter. While the 20x50mm UpClose G2 is light enough to hand-hold, for example at sporting events, the use of a tripod will make for sharper shake-free images during extended observing periods.
  • Standard accessories. A neck strap, eyepiece and lens covers, and a soft nylon carrying case with shoulder strap are standard equipment.

  • 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.
    3.2°
    Field of view 1000 yards:
    168'
    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.
    2.5mm
    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.
    6.25
    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.
    31.62
    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.

    7mm
    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
    42'
    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
    Weight:
    The weight of this product.
    28 oz.
    Warranty:
    Limited Lifetime
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    20X50mm UpClose G2 porro prism

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    20X50mm UpClose G2 porro prism
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    Our Product #: UC2050
    Manufacturer Product #: 71258
    Price: $39.95  Ground shipping for this item is $8.95 - Click for more info
    By adding 1 of these items to your cart your order total will be less than $100, and will ship within the 48 contiguous United States for $8.95. Add $60.05 to your order, however, and you qualify for free ground shipping (heavy items with fixed shipping, such as counterweights, excluded).
    MSRP: $48.95
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    This Celestron 20 x 50mm UpClose G2 is a very inexpensive, very high power porro prism that's light enough to allow comfortable strain-free extended use while watching football and sports, for vacation travel, for family picnics and week-end trips, and more . . .





    . . . our 34th year