Roof Prism
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 Leupold 111742 BX 2 Cascades Roof Prism Binoculars 10x42mm Mossy Oak Infinity $297.44 Time Remaining: 27d 14h 29m Buy It Now for only: $297.44 |
 Pentax 10x50 DCF WP Binoculars Roof Prism Hunting Birding MSRP 79900 $299.99 Time Remaining: 1d 17h 33m Buy It Now for only: $399.00 |
 Bushnell H2O 10x42 Waterproof Fog proof Binocular w Roof Prism $70.00 Time Remaining: 29d 1h 35m Buy It Now for only: $70.00 |
 Leupold BX 3 Mojave Binocular 12x 50mm Roof Prism Armored Black 111772 $428.95 Time Remaining: 20d 14h 37m Buy It Now for only: $428.95 |
 Kruger Optical Discovery Expedition Binoculars 8x42mm Roof Prism 81003 $81.99 Time Remaining: 27d 14h 37m Buy It Now for only: $81.99 |
 NEW Redfield Rebel Armored Aluminum Black Matte Body Roof Prism Binocular 67605 $129.99 Time Remaining: 28d 17h 58m Buy It Now for only: $129.99 |
 BURRIS Landmark Roof Prism Binoculars 8X 32mm 300197 NEW Binos $85.00 Time Remaining: 4d 3h Buy It Now for only: $85.00 |
 Kahles Roof Prism 10x42 Binocular NICE $599.99 Time Remaining: 14d 16h 13m Buy It Now for only: $599.99 |
 Tactical Binoculars 8x42 BK4 Roof Prism Center Focus Case $125.10 Time Remaining: 1d 19h 40m Buy It Now for only: $137.80 |
 BUSHNELL PERMAFOCUS 10X42 STREAMLINED ROOF PRISM BINOCULAR CAMO 171044 17 1044 $69.99 Time Remaining: 16d 20h 15m Buy It Now for only: $69.99 |
 NEW Tasco 10x42 Sierra Binocular Full Size Roof Prism WATERPROOF FOGPROOF SHOCK $31.17 Time Remaining: 2d 22h 6m Buy It Now for only: $31.17 |
 MINOX BD 85X52MM BR ASPH WATERPROOF ROOF PRISM BINOCULAR BLACK MATTE 62133 $399.99 Time Remaining: 3d 20h 1m Buy It Now for only: $399.99 |
 BRAND NEW Leupold BX 3 Mojave 8x42 Roof Prism Binoculars 111766 Waterproof Black $359.49 Time Remaining: 26d 14h 38m Buy It Now for only: $359.49 |
 Bushnell Powerview 8x21 Compact Folding Roof Prism Binocular Black $15.99 Time Remaining: 20d 1h 12m Buy It Now for only: $15.99 |
 BUSHNELL H20 10X25 WP FP ROOF PRISM BINOCULAR 130105 $57.12 Time Remaining: 13d 5h 35m Buy It Now for only: $57.12 |
 BSA 10x25mm Rugged Binoculars Roof Prism Center Focus $19.99 Time Remaining: 19d 17h 56m Buy It Now for only: $19.99 |
 Burris Landmark Roof Prism Binoculars 8X 32mm $25.00 (1 Bid) Time Remaining: 2d 34m |
 Burris Fullfield II Binoculars Camo 10x42 Roof Prism $280.44 Time Remaining: 29d 3h 23m Buy It Now for only: $280.44 |
 Bushnell Powerview Binocular 10X 32 Mid Size Roof Prism Black Rubber 131032 $34.18 Time Remaining: 3d 11h 27m Buy It Now for only: $34.18 |
 Bushnell 171043 PermaFocus 10x42 Roof Prism Focus Free $69.06 Time Remaining: 5d 22h 36m Buy It Now for only: $69.06 |
 Gently Used Bushnell 8x21 Compact Folding Roof Prism Binocular Black With Case $30.00 Time Remaining: 12d 13h 25m Buy It Now for only: $30.00 |
 Tasco Essentials Binocular 10X 25 Compact Water Resistant Roof Prism 168RB $16.17 Time Remaining: 29d 50m Buy It Now for only: $16.17 |
 Bushnell Legend 12X50 Binocular Roof Prism Waterproof Fogproof with Case 195012 $249.99 Time Remaining: 9d 11h 59m Buy It Now for only: $249.99 |
 PERRINI 10x70 Waterproof Roof Prism Binoculars 1278 $149.95 Time Remaining: 26d 5h 7m Buy It Now for only: $149.95 |
 NIKON PREMIER LX 10X32 HG L DCF HIGH QUALITY ROOF PRISM COMPACT BINOCULAR 7505 $599.99 Time Remaining: 2d 22h 44m |
 LEUPOLD BX 2 ACADIA 10 X 42 CENTER FOCUS ROOF PRISM $194.99 Time Remaining: 12h 21m Buy It Now for only: $194.99 |
 Vortex Optics Diamondback 10x42 Binocular BIN VT D241 Roof Prism Coat Waterproof $229.99 Time Remaining: 23d 22h 18m Buy It Now for only: $229.99 |
 BUSHNELL 140832 8x32 POWERVIEW BINOCULARS ROOF PRISM MULTI COATED OPTICS $44.99 Time Remaining: 11d 28m Buy It Now for only: $44.99 |
 Bushnell 140842C Binoculars Powerview 8x42 Roof Prism $70.00 Time Remaining: 5d 12h 21m Buy It Now for only: $70.00 |
 Tasco Essentials Binocular 8X 21 Compact Water Resistant Roof Prism Black 165RB $13.64 Time Remaining: 29d 50m Buy It Now for only: $13.64 |
 Bushnell Powerview Binocular 10x32 Mid Size Roof Prism 131032 029757131324 $39.52 Time Remaining: 23d 14h 52m Buy It Now for only: $39.52 |
 233208 Bushnell Trophy XLT Binocular 8x 32mm Roof Prism Green $63.99 Time Remaining: 3d 29m |
 Bushnell Powerview 12x32 FRP Roof Prism Binoculars $49.99 Time Remaining: 23d 9h 36m Buy It Now for only: $49.99 |
 New 2012 leupold bx 2 acadia 10X42 roof prism binocular camo 111749 $229.99 Time Remaining: 15d 9h 33m Buy It Now for only: $229.99 |
 Bushnell Powerview Binocular 16x32 Mid Size Roof Prism 131632 029757131638 $51.37 Time Remaining: 29d 14h 32m Buy It Now for only: $51.37 |
 Burris Landmark 10x32 Roof Prism Binoculars 300198 $95.00 Time Remaining: 21d 13h 53m Buy It Now for only: $95.00 |
 Bushnell Powerview 8x21 Compact Folding Roof Prism Binocular Camouflage $15.45 Time Remaining: 21d 21h 27m Buy It Now for only: $15.45 |
 Celestron Binocular Tripod Adapter for Roof and Porro Prism 93524 $19.95 Time Remaining: 22d 13h 28m Buy It Now for only: $19.95 |
 NEW 2012 LEUPOLD BX 2 111748 ACADIA 10X42 ROOF PRISM BINOCULAR BLACK $204.99 Time Remaining: 3d 18h 39m Buy It Now for only: $204.99 |
 234208 Bushnell Trophy XLT Binocular 8x 42mm Roof Prism Green $103.99 Time Remaining: 3d 30m |
 Bushnell Powerview 10x25 Compact Folding Roof Prism Binocular Black $32.63 Time Remaining: 23d 18h 45m Buy It Now for only: $32.63 |
 Bushnell H20 8x42 Wp fp Roof Prism Binocular 158042 $98.10 Time Remaining: 12d 14h 16m Buy It Now for only: $98.10 |
 Bushnell Powerview 8 16x40 Roof Prism Binocular $94.95 Time Remaining: 10d 3h 32m Buy It Now for only: $94.95 |
 NEW 2012 LEUPOLD BX 2 111747 ACADIA 8X42 ROOF PRISM BINOCULAR CAMO $204.99 Time Remaining: 3d 18h 31m Buy It Now for only: $204.99 |
 Bushnell Powerview 8x21 Compact Folding Roof Prism Binocular Black $15.99 Time Remaining: 2d 17h 51m Buy It Now for only: $15.99 |
 Bushnell Powerview Binocular 10X 25 Compact Roof Prism Black Rubber 85oz 132516 $22.78 Time Remaining: 1d 23h 4m Buy It Now for only: $22.78 |
 Kruger Optical Kilimanjaro Waterproof Roof Prism Binoculars 10x42 62330 $108.50 Time Remaining: 7d 23h 4m Buy It Now for only: $108.50 |
 Nikon Trailblazer ATB Binocular 10x 42mm Roof Prism Armored Black $124.99 Time Remaining: 3d 49m |
 Leica Ultravid 8x50 Black Matte Roof Prism Armored Binocular Weatherproof 40295 $1,499.99 Time Remaining: 9d 19h 39m Buy It Now for only: $1,499.99 |
 Bushnell Powerview Binocular 12X 25 Compact Roof Prism Black Rubber 131225 $26.28 Time Remaining: 1d 23h 4m Buy It Now for only: $26.28 |
 Bushnell H2O 10x 42mm Waterproof Fogproof Roof Prism Binocular $89.99 Time Remaining: 6d 2h 7m Buy It Now for only: $89.99 |
 OPMOD 8x42mm Waterproof Roof BaK4 Prism Binoculars Matte Black OPMOD W1 0843A $144.99 Time Remaining: 26d 14h 43m Buy It Now for only: $144.99 |
 Leupold BX 2 Cascades Binocular 10x 42mm Roof Prism Armored Black 111741 $290.95 Time Remaining: 20d 14h 22m Buy It Now for only: $290.95 |
 Vortex Optics Diamondback 8x42 Binocular BIN VT D248 Roof Prism Coat Waterproof $219.99 Time Remaining: 23d 22h 18m Buy It Now for only: $219.99 |
 Vintage Leupold Wind River 10x40 roof prism IF Binoculars $199.00 Time Remaining: 3d 1h 53m |
 CARSON TK 821 TREK 8 X 21MM COMPACT ROOF PRISM BINOCULAR $27.49 Time Remaining: 29d 16h 5m Buy It Now for only: $27.49 |
 Bushnell Elite Binoculars 8x42 E2 Blk Roof Prism ED WP $499.00 Time Remaining: 22d 13h 59m Buy It Now for only: $499.00 |
 SIGHTRON 8X32 WATERPROOF ROOF PRISM BINOCULAR $80.00 Time Remaining: 12d 16h 7m Buy It Now for only: $80.00 |
 Leupold BX 2 Cascades Roof Prism Binoculars 10x42mm Black $290.90 Time Remaining: 24d 29m Buy It Now for only: $290.90 |
 NEW LEUPOLD ACADIA 10X42 BINOCULARS 111748 BLACK ROOF PRISM $219.99 Time Remaining: 16d 18h 54m Buy It Now for only: $219.99 |
 Celestron Binocular Tripod Adapter for Roof and Porro Prism 93524 $19.95 Time Remaining: 10d 5h 52m Buy It Now for only: $19.95 |
 Leupold BX 2 Cascades 7x42 Center Focus Roof Prism Binocular 111736 $239.99 Time Remaining: 27d 21h 38m Buy It Now for only: $239.99 |
 Kahles Roof Prism 10x42 Binocular $400.00 Time Remaining: 3d 2h |
 Bushnell 10X42 Natureview Roof Prism Binoculars + Accessory Package Bushnell A $147.99 Time Remaining: 25d 14h 30m Buy It Now for only: $147.99 |
 Bushnell Powerview 8x21 Compact Folding Roof Prism Binocular Black $15.00 Time Remaining: 8d 3h 57m Buy It Now for only: $15.00 |
 BUSHNELL Powerview 8x21 Compact Roof Prism Binoculars Black 132514 $15.99 Time Remaining: 20d 17h 53m Buy It Now for only: $15.99 |
 Leupold 111739 BX 2 Cascades Roof Prism Binoculars 8x42 CAMO Mossy Oak Infinity $278.55 Time Remaining: 6d 15h 10m Buy It Now for only: $278.55 |
 BSA Tactical Binoculars 8x42 BK4 Roof Prism $129.95 Time Remaining: 14d 17h 57m Buy It Now for only: $129.95 |
 Bushnell Powerview 8x42 Roof Prism Binoculars Black $85.99 Time Remaining: 23d 13h 58m Buy It Now for only: $85.99 |
 Bushnell Powerview Binocular 12X 25 Compact Roof Prism Camo Rubber 113oz 131226 $26.28 Time Remaining: 3d 11h 27m Buy It Now for only: $26.28 |
 67610 Redfield Rebel 8x32 Binoculars Center Focus Roof Prism Black $109.99 Time Remaining: 4d 40m |
 Celestron 71326 8X42 Nature Roof Prism Binocular $99.00 Time Remaining: 15d 12h 57m Buy It Now for only: $99.00 |
 BSA 10x25mm Rugged Binoculars Roof Prism Center Focus $24.79 Time Remaining: 10d 14h 49m Buy It Now for only: $24.79 |
 BUSHNELL POWERVIEW BINOCULARS ROOF PRISM MULTI COATED OPTICS 8x32 $48.95 Time Remaining: 14d 15h 9m Buy It Now for only: $48.95 |
 NEW STEINER NIGHTHUNTER XP INDIVIDUAL EYE FOCUS ROOF PRISM BLACK BINOCULAR 5421 $899.99 Time Remaining: 7d 23h 9m Buy It Now for only: $899.99 |
 Bushnell Powerview 16x32 Roof Prism Camo Binoculars $55.99 Time Remaining: 4d 16h 28m Buy It Now for only: $55.99 |
 Redfield Rebel Binocular 8x32 Roof Prism Black RF67610 030317676100 $126.50 Time Remaining: 28d 14h 32m Buy It Now for only: $126.50 |
 Tasco Sonoma 10x42 Roof Prism Bincoulars + 7 LED NEW $16.42 Time Remaining: 4d 12h 55m Buy It Now for only: $26.24 |
 BUSHNELL 138005 H2O BLACK ROOF PRISM COMPACT FOLDABLE BINOCULARS 8 X 25MM $59.85 Time Remaining: 8d 13h 30m Buy It Now for only: $59.85 |
 New Steiner 10x42 Merlin Pro Waterproof Roof Prism Black Matte Binocular 4581 $549.99 Time Remaining: 21d 16h 12m Buy It Now for only: $549.99 |
 Nikon 10x25 Sportstar Compact Weather Resistant Roof Prism Binocular 8202 $79.95 Time Remaining: 9d 14h 4m Buy It Now for only: $79.95 |
 Bushnell Natureview Binocular 8x42mm Blk Roof Prism Waterproof $129.88 Time Remaining: 19d 38m Buy It Now for only: $129.88 |
 Sightron Binoculars SIII 10X42mm Roof Prism Waterproof Blk $343.75 Time Remaining: 19d 3h 32m Buy It Now for only: $343.75 |
 Sightron SIII Binoculars 8X42mm Roof Prism Waterproof $312.50 Time Remaining: 19d 3h 32m Buy It Now for only: $312.50 |
 Tasco Sierra 12 x 50 Roof Prism Binocular $73.10 Time Remaining: 23d 18h 54m Buy It Now for only: $73.10 |
 Columbia Sportswear Company Timberline 10 X 42 Roof Prism Binoculars NIB $109.99 Time Remaining: 4d 22h 46m Buy It Now for only: $135.00 |
 Powerview 16x32 Compact Folding Roof Prism Binocular New $43.63 Time Remaining: 9d 23h 40m Buy It Now for only: $43.63 |
 Bushnell H2O 10x42 Waterpf Fogpf Roof Prism 151042 Bino $157.95 Time Remaining: 4d 10h 56m Buy It Now for only: $157.95 |
 Leupold BX 3 Mojave Binocular 8x 42mm Roof Prism Armored Black 111766 $365.95 Time Remaining: 20d 14h 41m Buy It Now for only: $365.95 |
 Bushnell H20 10x42 Wp fp Roof Prism Binocular 150142 $109.58 Time Remaining: 29d 13h 56m Buy It Now for only: $109.58 |
 Leupold BX 2 Cascades Binoculars 8x42mm Roof Prism Blk $279.99 Time Remaining: 19d 54m Buy It Now for only: $279.99 |
 Redfield Rebel Binocular 10X 50 Roof Prism Black 114503 $164.91 Time Remaining: 28d 14h 32m Buy It Now for only: $164.91 |
 Leupold BX 3 Mojave Roof Prism Binoculars 12x50mm Mossy Oak Treestand $448.90 Time Remaining: 24d 39m Buy It Now for only: $448.90 |
 RUBBER ARMOURED BINOCULARS ROOF PRISM 20 X50 $7.99 Time Remaining: 4d 11h 29m Buy It Now for only: $29.99 |
 BUSHNELL ELITE BINOCULARS 8x42MM E2 BLACK ROOF PRISM 628042ED FREE SHIPPING $499.00 Time Remaining: 21d 15h 52m Buy It Now for only: $499.00 |
 NEW BUSHNELL POWERVIEW 8x21 ROOF PRISM BINOCULARS BLACK 132514 21mm LENS $15.99 Time Remaining: 3d 1h 40m Buy It Now for only: $15.99 |
 Kruger 10x42 Discovery Expedition Binocular Roof Prism $88.44 Time Remaining: 19d 48m Buy It Now for only: $88.44 |
 Bushnell Powerview 10x32 Roof Prism FRP Black Binoculars $47.58 Time Remaining: 20d 22h 39m Buy It Now for only: $47.58 |
 Bushnell Powerview 10x32mm Roof Prism FRP Black $28.07 Time Remaining: 6d 22h 4m Buy It Now for only: $28.07 |
 Redfield Rebel 8x32 Roof Prism Binoculars Black 67610 $136.97 Time Remaining: 17d 16h 36m Buy It Now for only: $136.97 |
Roof Prism
How to Choose the Best Birding Binoculars
Optics workers will tell you they are often asked to recommend the best binocular for birders (bird watchers) To match the binocular to the birder it helps to first look at the needs of the birding enthusiast.
What sort of optical demands must we consider? Well for one thing the birder need to see details like the patterns and color of feathers, often in dim light such as under a tree canopy or in twilight. They need good magnification so that they can easily identify birds at a distance and sometimes they will want to observe birds at very short distances so they want their binoculars to work for close focus observing too, maybe even down to just a few meters.
They need true color viewing so they can see everything as it really is colored and not with any tint or false color. They also need a reasonable field of view so they can observe birds in flight easily and be able to pick birds out from the surrounding trees.
They want the binoculars to be light enough to carry and hang on a neck-strap. Their binoculars should be light enough to hold comfortably for viewing and easy enough on the eyes to be able to use for long periods. Birders usually want their binoculars to be compact enough to pack in a rucksack. For observing from hides they often want to use their binoculars on a tripod or mono-pod so a fitting for these adapters is advisable. If their bird watching is in the wilderness then rugged construction and some element of waterproofing and fog-proofing is also advisable.
When looking at binocular specifications we usually pay most attention to the two numbers that define the basic specifications. The first number gives us the magnification factor, so an 8x binocular magnifies an image (brings it closer) by 8 times. The higher the magnification the more difficult it becomes to use the binoculars effectively due to the natural hand-shake which makes it difficult to keep the bird in view and also the smaller the field of view will be. For birding use, an 8x binocular is the most commonly used though in some circumstances enthusiasts will use higher magnification.
The second number in the specs tells us the diameter of the objective lens. This is important for two reasons, firstly the larger the diameter the more light is captured by the binocular so the clearer and brighter the resulting image. Secondly, the larger diameter also gives a larger field of view. In the birding world, the most popular objectives are 40mm and 42mm. Getting much higher than this makes the binocular a little too heavy and large.
Other important considerations are the quality of the lenses and prisms and the optical coatings used on those elements. These coatings reduce loss of light through reflection from the binocular and its internal components and they help to preserve good clarity and true color throughput. As a rule of thumb look for Fully-Multi-Coated (FMC) coatings for bird watching use. The specification for eye relief refers to the distance between the eyepiece and the eye. Those who wear glasses will need a longer eye relief to allow for the extra distance caused by the glasses being between the binocular and their eye.
Roof and Porro Prism designs refer to the two body styles of binoculars. This difference comes about through the placement of the internal prisms within the binocular body. Roof prism types are the more compact and modern looking. Their objective lenses are more or less in line with the eyepieces, while porro prism types are the traditional style with the lenses stepped out from the line of the eyepieces. More and more birding enthusiasts are now opting for the roof prism type particularly as their quality has caught up with the porro types in recent years.
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Maths questions help?
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The play house in the backyard is shown in the diagram below. The walls & floor can be described as a rectangular prism, while the roof has the shape of a triangular prism.
(a) Bob would like to paint the outside walls of the play house yellow. How many square metres will be painted yellow? (ignore windows & doors)
(b) She would like to paint the outside of the roof red. How many square metres will be painted red?
(c) If 1 litre of paint covers an area of 9m², how many litres of red and yellow paint are required for two coats?
(a) 2*(2m*2m)+2*(2m*4m)=8m^2+16m^2=24m^2
(b)2*(1.6m*4.5m)+2*(0.5*1m*2.5m)=14.4m^2+2.5m^2=
=16.9m^2
(c)(16.9m^2+24m^2)/(9m^2/l)=4.54l
hope thats right
Porro vs. Roof Prism Designs