Astronomy
941's Rig
Astronomy
HOVERCRAFT 611 & 44 >15 x 70's
Cell phone Camera
(Green) Night Vision
Astronomy
With powerful magnification and large objectives, Nikon's black 16x50 Aculon A211 Binocular is an ideal device for Hunters,CBer's,Birders,Astronomy, and Outdoor Enthusiasts who require an optic that delivers detailed high-resolution, long-range observations.
The enhanced light-gathering ability offered by the 50mm objectives helps to ensure views remain bright and clear when observing subjects at extreme long range, even under heavy cloud cover or dim light conditions, allowing users to clearly resolve objects or game, like 941, or 259 & 559 making clear identification. Anti-reflection multi-coated aspherical lenses, made with environmentally friendly Eco-Glass elements, complement the BAK4 Porro prism light path to deliver high-contrast images with enhanced depth of field without edge distortion, as well as accurate color fidelity. Despite its 16x magnification, this version of the A211 has a wide angle of view that helps to offset the dimming of the view and appearance of visible hand shake that are common with high-power optics such as this, while presenting the user with an immersive observational experience.
The Aculon's sculpted rubber-armored housing is designed to fit naturally into the observer's hand and provide secure non-slip handling. It is offered here in a subdued black color. Fold-down rubber eyecups and a comfortable eye relief enable easy viewing without eye fatigue, especially during long observation sessions. For those who might experience arm fatigue or visible hand shake from holding a high-power, large-objective optic, the binocular can be tripod mounted using the included adapter. The combination of image quality and user-friendly design makes the 16x50 Aculon A211 a natural option for long-range glassing in even the most challenging light.
Optical Performance
Powerful 16x magnification allows for highly detailed observations of distant subjects (like mud ducks)
Large 50mm objective lenses improve light-gathering ability to ensure distant views remain bright and sharp for better resolution, even in challenging light conditions
Traditional Porro prism light path produces a rich depth of field, allowing the user to discern the relative distances between objects being viewed
High refractive index BAK4 prisms deliver a round exit pupil and a crisp and clear image with limited edge distortion
Aspherical eyepiece lenses correct spherical aberration to produce clear and crisp images, with reduced edge distortion and astigmatism
Anti-reflection multi-coated optics produce neutral and accurate color fidelity, and improve contrast and image brightness
Wide 61° apparent angle of view reduces the appearance of visible hand shake that is common when holding high-power optics such as this
220-foot field of view at 1000 yards
Use and Handling
Large slip-resistant center focus wheel is easy to manipulate, even while wearing gloves
Right-eye dioptric correction compensates for individual user's optical prescription for clearer and sharper views
56-72mm interpupillary adjustment range
Fold-down rubber eyecups for comfortable use with or without eyewear
Tripod mountable with adapter for hands-free use with reduced vibration and arm fatigue
12.6mm eye relief allows easy viewing without eye fatigue, especially during long observation sessions
3.1mm exit pupil
Construction Details
Environmentally friendly Eco-Glass is made without lead or arsenic
Protective rubber armoring provides a comfortable slip-resistant grip even in cold weather
Ergonomically sculpted grips
Tripod adapter included for hands-free use to eliminate the vibrations, shakes, and arm fatigue that are common when holding high-power/large-objective optics
One-piece tethered ocular rainguard protects eyecups
Objective lens caps can be clipped to neck strap to avoid losing them during observation sessions
Weight: 32.5 ounces
These Belonged to 941's Grandfather
Product description
Style:SkyMaster 15x70 Binocular | Configuration:Binocular
Product Description
Celestron’s SkyMaster Series of large aperture binoculars are a phenomenal value for high performance binoculars ideal for astronomical viewing or for terrestrial (land) use - especially over long distances. Each SkyMaster model features high quality BaK-4 prisms and multi-coated optics for enhanced contrast. Celestron has designed and engineered the larger SkyMaster models to meet the special demands of extended astronomical or terrestrial viewing sessions.
Amazon.com
Binoculars come in a wide range of shapes and sizes these days, and an even wider range of prices. It's easy to spend less than $100 or more than $500 for what may appear to be, at least outwardly, comparable models. While they may look the same, they are probably quite different on the inside.
Recently, the binocular market has seen a flood of giant binoculars at prices that were unheard of just a few years ago. In general, giant binoculars are defined as those that magnify the view 10 times or more and have 70-mm or larger front (objective) lenses. It used to be that the least expensive giant binoculars cost in excess of $150, even $200. All that changed not long ago, when the bottom fell out of the price cellar. Now, several companies import giant binoculars that sell for half that, or less.
Celestron's 15x70 SkyMaster binoculars are one of the leaders in the low-price giant binocular arena. They certainly sound good on paper. The SkyMasters include multicoated optics and BaK-4 internal prisms, two features that promise brighter, better images, and key points to look for when judging a pair of binoculars. They also come with an adapter for attaching them to a photo tripod, which is a must to use them to their fullest, and a soft carrying case. But just because they are cheap doesn't always mean they are worth the price. Would it be better to save up for a more expensive pair?
To find the answer, I had an opportunity recently to judge the SkyMasters against a pair of Fujinon 16x70 FMT-SX binoculars , one of the finest pairs of giant binoculars sold today. Like the SkyMasters, the Fujinons feature BaK-4 prisms, but also have fully multicoated optics. As a general rule, superior coatings mean superior image sharpness and contrast. But then, that should be expected, given that the Fujinons cost many times more than the Celestrons.
While the Fujinons were clearly the better performer, the Celestron SkyMasters held up admirably. Image brightness, quality, and contrast were all remarkable considering their bargain price. Although images were a little soft across the outer 25% of the Celestron's field, the overall view was impressive nonetheless.
Some inexpensive binoculars have very sloppy focusing, causing the eyepieces to tilt and shift. Not so with the SkyMasters. I found that their center-focusing mechanism worked smoothly, with no apparently backlash or wobble. Eye relief (the distance you hold your eyes away from the eyepieces to see the full field) is stated to be 18 mm, a good distance for higher power binoculars and an important consideration if you must wear glasses when viewing. The SkyMasters are also light enough to support by hand for short periods of time, although buyers would be well advised to mount them on a sturdy photo tripod.
The bottom line is, if you are considering a pair of giant binoculars, whether for bird watching, stargazing, or another recreational use, and have a limited budget, Celestron's giant 15x70 SkyMasters represent an excellent value. --Phil Harrington, author of Star Ware and Star Watch
BINOTECK Night Vision HD The 12 x 42's ( I Love These )
Comet 42
M13
These are my go to Day or Night
Ship to Floyd The Barber 259
I Bagged these with my NIGHT GLASS 20 X 80's
In Sagittarius > M22 * M17 * M16 * M25 * M21 * M23 * M20 * M8
In Aquila > M11
In Cygnus > M29 * M39
In Hercules > M13 * M92
In Cassiopeia > ' The Double Cluster '
InAndromeda > M31
In Triangulum > M33
Jupiter & it's Moons
Pleiades > Star Cluster
Orion > Nebula M12
Phases of Venus
Saturn & it's Moons
Night Vision HD
Night Glass
I told them to "Test them before shipping to me." And they said "We are! Can't you See?".."So stop calling us every 10 min. Greenfish!"
Specifications for Nikon Aculon A211 Binoculars - 16x50mm:
Magnification: 16x
Objective: 50mm
Angular field of view (Real/degree): 4.2
Angular field of view (Apparent/degree): 60.8
Field of view at 1,000m (m): 73
Exit pupil (mm): 3.1
Relative brightness: 9.6
Eye relief (mm): 12.6
Close focusing distance (m): 9.0
Interpupilarry Distance Adjustment: 56-72
Weight (g): 925
Length (mm): 179
Width (mm): 197
Prism Type: Porro
Not for Astronomy
Aspheric Lenses
An aspheric lens is simply a lens with a surface which is not perfectly spherical or not perfectly convex or concave or, to put it another way, you can find different areas on the lens with different degrees of curvature. The asphere's more complex surface profile can reduce or eliminate spherical aberration and also reduce other optical aberrations compared to a simple lens.
By using different degrees of curvature, a single aspheric lens can also can often replace a much more complex multi-lens system using standard spherical lenses, resulting in a smaller, lighter instrument and/or a cheaper one. On the other hand, there is nothing automatic about the performance and quality of a lens just because it has the aspheric label. For instance, many low end optics use aspheric lenses that are poured into a mold, making them cheaper to produce than a conventional ground lens. At the other end of the quality spectrum are aspheric lenses which are ground just like a spherical lens but only in much more sophisticated shapes. These are very difficult and expensive to produce, but the results can be incredible.
[Spherical vs. Aspheric Lenses] Aspheric vs. Spherical: (see image on the right) Spherical lenses have a constant curvature on their surface, much in the same way that a sphere has a constant curvature. However, the power of the lens at different points is variable, resulting in relative defocus of more peripheral light rays. Due to this constant curvature, these lenses are easier to make; however, their optics are worse. A perfectly aspheric lens on the other hand has a variable curvature but a constant power even at the periphery of the lens. This results in the same focus of all light rays, both central and peripheral. These lenses are more difficult to make, but their optics are better.
(I loaned her my pair)
Nikon A211 Specs
Prism Type Porro
Magnification 16 x
Objective Lens Diameter 50 mm
Angle of View 4.2° (Actual)
Field of View 220.0' @ 1000 yd / 73.0 m @ 1000 m
Minimum Focus Distance 29.5' / 9 m
Exit Pupil Diameter 3.1 mm
Eye Relief 12.6 mm
Interpupillary Adjustment 56 to 72 mm / 2.2 to 2.8"
Focus Type Center
Tripod Mount Yes (Adapter Included)
Dimensions 7.8 x 7.0" / 19.7 x 17.9 cm
Weight 32.6 oz / 925.0 g
TARGET > The 'Golden Handle' > Sidelight (once a month)