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Explore Scientific BT-82 SF Giant Binocular With 62° 20mm LER Eyepieces

Explore Scientific BT-82 SF Giant Binocular With 62° 20mm LER Eyepieces
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 Explore Scientific BT-82 SF Giant Binocular With 62° 20mm LER EyepiecesExplore Scientific BT-82 SF Giant Binocular With 62° 20mm LER Eyepieces 
Price  £1,033.00
List Price  £1,319.00
Saving Of  £286.00
(Inc. 20% VAT)
+

Model:  0114210
Brand:  Explore Scientific

Availability  

  

Generally In Stock, Please Confirm Before Ordering



2 Year Warranty On All New Items
(Excluding Batteries & Globes)



Giant binocular for observing the starry sky, nature and landscape.
Observe the beauty of the starry sky at night and distant objects in nature during the day. Globular star clusters, glowing gas nebulae, the moon with its craters and even planets can be observed wonderfully on a clear night. But also all other distant things in nature and landscape, even ships and airplanes can be seen in detail. With the all-round binoculars of the EXPLORE SCIENTIFIC BT series, you can get up very close. Thanks to the large, light-gathering lenses and the professional coatings on all lens surfaces, these binoculars produce bright and brilliant images even at night and at twilight, providing a special viewing pleasure. The comfortable 45 degree viewing angle allows fatigue-free use even when the binoculars are tilted strongly.

A large binocular can also be called a double refractor telescope
One complete lens telescope with the full light gathering power is available per eye. Experience a whole new dimension of observing. Objects are reproduced almost vividly in these binoculars and observing with both eyes is basically very relaxed. Last but not least, this comfortable way of observation increases the recognition of the finest details and effectively prevents rapid eye fatigue.

Extremely robust binoculars with magnesium housing, sealed and filled with nitrogen
The BT series binoculars are designed for tough outdoor use. The IPX6 sealed and nitrogen-filled design effectively prevents fogging of the internal optics even under difficult weather conditions. The very light magnesium housing saves weight and makes it easy to handle. Two EXPLORE SCIENTIFIC 20mm eyepieces of the 62 degree LER series already included. EXPLORE SCIENTIFIC is an established manufacturer of extremely high-quality eyepieces in the astronomy scene. An optical system is only as good as its weakest component. Therefore we have decided to deliver these giant binoculars with a pair of quality eyepieces of the 62 degree LER series. With an apparent field of view of 62 degrees and a focal length of 20mm, the BT-82 binoculars produce a 24x magnification. Thus these wide angle eyepieces offer a very good overview (field of view 2,6 degree) at moderate magnification. The large interpupillary distance of these LER (long eye relief) eyepieces of 15mm and soft silicone eyecups, which can be turned inside out, also guarantee a comfortable and relaxed view. For astronomy, a flat and sharp image field is advantageous and offers a particularly impressive viewing experience even during the day. Due to the waterproof design and the argon filling, these eyepieces are absolutely durable and easy to clean.

Interchangeable eyepieces with 1.25 inch / 31.7mm plug-in diameter
Adjust the magnification and field of view to your individual needs and choose from a wide range of available eyepieces. All eyepiece types with a plug-in diameter of 1.25 inch / 31.7mm can be used with the binoculars of the BT series. Especially recommended are EXPLORE SCIENTIFIC eyepieces of the 62 and 82 degree series with focal lengths from 8 to 26mm (see item No. 02188xx and 02196xx). The magnification can be varied from 18x to 60x (focal length binoculars : focal length eyepiece = magnification). The eyepieces are held in the binoculars by a precise brass compression ring clamp and guarantee a tilt free position.

Use of color and nebula filters for astronomical observations
Increase the contrast and visibility of objects and details by screwing the corresponding filters directly into the thread of the eyepiece sleeves. The use of color and nebula filters must of course always be done in pairs. Suitable are all EXPLORE SCIENTIFIC screw filters with 1.25inch / 31.7mm diameter (see item No. 03102xx)

Comfortable 45 degree view and helical single focus
The 45-degree viewing angle allows a relaxed observation position even when the binoculars are tilted strongly. Also the individual interpupillary distance can be adjusted in a range from 54 to 76mm. With the fine helical individual focusing, precise focusing is achieved effortlessly. Extendable dew caps The integrated dew caps can be removed in high humidity and cold conditions. This avoids fogging of the outer objective lenses and effectively shields additional control light coming in from the side.

Integrated carrying handle
A metal carrying handle located at the center of gravity facilitates transport and ensures a secure hold during tripod assembly.

Suitable tripods and tripod connection
When using these large binoculars, a sturdy photo tripod with an appropriate load capacity is highly recommended. The connection is made via two 1/4 inch or one 3/8 inch threaded holes (standard photo tripod thread) in the tripod adapter of the binoculars. The ideal solution is to use the optional availlable EXPLORE SCIENTIFIC U-Mount with field tripod (item No. 0114300). This is specially designed for the large binoculars of the BT series and carries these devices absolutely safely. The excellent mechanism with adjustable friction in both axes allows easy moving and tracking. The binocular position is kept stable depending on the adjusted friction intensity. Vibrations are reduced to a minimum by the massive construction of the U-Mount and the large stainless steel tripod. Even at high magnification there are no vibrations and the finest details can be observed.


FEATURES
Large binoculars for observing the starry sky, nature and landscape
Observe globular star clusters, glowing gas nebulae, the moon with its craters and even planets
Also wild animals, ships and airplanes can be seen in detail
Highly light gathering lenses produce a bright and high-contrast image
All-round binoculars, but especially suitable in twilight and at night
The comfortable 45 degree viewing angle allows fatigue-free use
One complete lens telescope with the full light gathering power is available per eye
Extremely robust binoculars with magnesium housing, sealed and filled with nitrogen
Two EXPLORE SCIENTIFIC 20mm eyepieces of the 62 degree LER series already included
24x magnification and an apparent field of view of 62 degrees, true visible field of 2,6 degrees
Large interpupillary distance of 15mm to the eyepiece lens for comfortable viewing
Eyepieces interchangeable and with standardized plug-in diameter of 1.25 inch / 31.7mm
The magnification can be adjusted with optional eyepieces from 25x to 75x
Precise brass eyepiece compression ring clamps for tilt-free fit
Color and nebula filters can be used for astronomical observations
Extendable dew caps prevent fogging of the outer objective lenses and stray light
Integrated carrying handle facilitates transport and mounting on the tripod
Tripod connection via two 1/4 inch or one 3/8 inch threaded holes (standard photo tripod thread)
Tripod recommendation: EXPLORE SCIENTIFIC U-mount with field tripod (Art.No. 0114300)
Objective type: Air spaced achromatic lens (2 elements/ 1 group)
Coating: full multilayer coating on all optical surfaces
Aperture, focal length and aperture ratio: 82mm / 470mm / F=5.7
Sealed to IPX6 standard and nitrogen filled: yes / yes
Close focus distance: 35 meters
Eyepiece mount diameter: 1.25'' / 31.7mm
Adjustable interpupillary distance: 54 to 76 mm
Helical single focus: yes
BAK-4 prism system for a bright and high-contrast image
Dimensions and weight of binocular: 445 x 226 x 122mm, 4.3kg
Housing color of binocular: white

SCOPE OF DELIVERY
Giant binocular with carrying handle (without tripod)
Eyepieces ES 20mm 62 degrees LER Series (2pcs)
Precisely fitting foam insert for transport
Dust covers for objectives and eyepiece sockets
Instruction manual

Technical Data
FIELD OF APPLICATION
Field of application
Astronomy
Bird watching & Nature observation
Night
TYPE
Type Giant Binoculars
OPTICAL SPECIFICATIONS
Optical design
Achromatic Refractor
Porro
Magnification 24
LE Eyepieces ✓
Mirror/Lens diam. 82 mm
Focal length 470 mm
Aperture ratio 5.7
Apparent field of view 62 degrees
Material prismn BaK-4
Type of coating Enhanced Multilayer Desposition (EMD)
Exit pupil min. 3.5 mm
Eyepieces for eyeglass wearers ✓
Diopter setting ✓
Field of view 2.6 degrees
Near focus from7 15 m
GENERAL TECHNICAL DATA
Waterproof8 ✓
Level of protection IPX6
Inert gas purged ✓
Tripod adapter thread ✓
Focusing system Individual eyepiece focus
Single eye adjustment ✓
Eyecups Rubber eyecups, foldable
Interpupilar distance min. 54 mm
Interpupilar distance max. 76 mm
Eye relief 15 mm
Colour white
Body material Magnesium
Dust protection caps Dust protection caps for front lens and eyepiece holder
Extended warranty 10 years
DIMENSIONS & WEIGHTS
Total length 445 mm
Total width 226 mm
Total height 122 mm
Net Weight total (incl. accessories) 4300 g

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Some items that are showing as in stock are in stock at our holding warehouses, not at the shop. To double check the stock levels at the shop, please contact us on 01909774369 or sales@rothervalleyoptics.co.uk.

The delivery times for most items is 1 - 2 days but again, please double check stock levels on important orders before placing an order via the website.

The delivery costs for courier next day are for mainland UK only. If you live in the Scottish Highlands/Islands, Channel Islands or Northern Ireland, then a shipping surchage will apply. please contact us for prices. Smaller items can still go 1st class via Royal Mail.

Please note that if you are wanting to take advantage of our Saturday and Sunday timed services or next day pre 12 or pre 10:30 services, you MUST check that the stock is here at the shop before placing orders. Also, orders using the Saturday and Sunday services must be placed before 1pm the previous working day. Also, please remember to check that the stock is here at the shop before placing orders. If the stock is not at the shop, we won't be able to ship on any of the timed services. 

Please note International customers will need to contact us for a shipping price prior to ordering via the website. We don't ship all items internationally. It is at our discretion what we ship outside of the UK. This all depends on the size and weight of the items. Please get in touch with us for any postage costs. Please note we do NOT ship telescopes or heavy items outside of the UK. This is due to massive postage costs and problems regarding returns.

If you have any questions regarding stock levels or delivery, please get in touch.

Zygo Interferometer Testing For ED Refractor Telescopes!

We are extremely pleased to announce our Zygo Interferometer is now installed and ready for use! Our experienced staff can test refractor lenses up to 120mm aperture and provide a comprehensive 2 page report showing the optical quality and Strehl ratio, plus much more information. We are using the very latest Zygo MX software to provide a more detailed report compared to other standard reports.

 

The interferometer is essentially a measuring instrument. Within the interferometer is a calibrated laser that is pointed through the optical test surface, then onto a high quality reference sphere, then back through the test subject then to an internal camera which gives us the measurement on the screen. From this, we can adjust the position of the test optic and the reference sphere to obtain a perfectly calibrated system. The more central the laser to the test optic and then on return, the better and more accurate reading and measurement we can take. This takes a lot of adjustment to get the best results from the optical surface. Once the measurement has been taken, we are provided with a series of results that show the optical quality of the surface plus other information. Continue reading for an explanation of the individual values and you can also see a test report that was done on one of our RVO Horizon 60 OTAs. 

We are offering certain telescopes with a Zygo test at an extra cost. Mainly ED doublets and triplets. All available telescopes with a Zygo test report are listed here. Just select Zygo Test Report from the drop down box at the top of the listing and we will test the optics in house and provide a full 2 page report with your scope. This will show you the optical quality of your telescope optics. We can also offer this service on your refractor telescope. Please get in touch for more details about this. 

At Rother Valley Optics, one thing we pride ourselves on is customer service and quality of our equipment. When we test your telescope, we will ensure that it is of the highest quality otherwise, we will reject the scope under our strict quality control and test another model for your peace of mind. One of the main values to look at when testing a refractor is the Strehl ratio. The higher this number, the higher quality lens you have. At Rother Valley Optics, we will guarantee the highest possible Strehl ratio for your telescope.  We will aim to provide 0.95 Strehl or higher on Takahashi, RVO Horizon, William Optics and many more! Generally, the higher the Strehl ratio, the lower the Astigmatism and Coma meaning a better image quality from your instrument. 

Other measurements such as the PV and RMS are important too. With these measurements, the lower the number the better as it shows less curvature on the lens. The flatter an optical lens, the better it will perform. The PV rating (Peak To Valley) is a measurement from the highest point (Peak) to the lowest point (Valley). From this we get the RMS (Root, Mean, Square). This is a similar figure to the PV and measured exactly the same way. The RMS is basically an average height difference from the PV so again, the lower the better. As you can see form the example below, we measured an RMS of just 0.027 wave which is a very good value.

We also measure the Power with our systems which is essentially the error from the reference sphere to the test optic. The reference sphere we use on our system is a very high quality sphere so the closer to zero the Power, the less error between the 2 elements thus ensuring a higher quality optical surface. 

You will also see some more values such as Astigmatism and Coma. Again, these are measured by the interferometer when we take measurements of the optical surface after adjustment. These are values which ideally would be at 0 but as our test optics are all curved lenses, there will always be astigmatism and coma present. The lower the number, the less of these aberations you will effectively see but with most refractors, you can buy field flatteners which will compensate for the coma anyway. The astigmatisms value is explaining the error between the symmetrical curvature of the lens. Basically, no lens will be perfectly symmetrical, the lower the astigmatism, the more symmetrical the lens surface is. 

Once the Zygo test report has been completed, the optical alignment is thoroughly tested and tuned to ensure they are spot on before they leave us. 

All available telescopes are on the website at the link below and ones we've tested already that are available straight away are also listed.

https://www.rothervalleyoptics.co.uk/zygo-tested-refractors.html

Here is an example of the test what we provide. This was a test on one of our Horizon 60 ED OTA's.

For any questions about this amazing new service, please either call 01909774369 or email sales@rothervalleyoptics.co.uk.

 


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