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AI Overview
N-BK7 roof prisms (often called Amici or "Dach" prisms) are specialized optical components that deflect light by
90∘90 raised to the composed with power
90∘
 while inverting and reverting (rotating
180∘180 raised to the composed with power
180∘
) the image, making them ideal for compact imaging systems like binoculars and scopes. Made from N-BK7 borosilicate glass, they offer high visible transmission (
350350
350
–
2200
nm
) and are a durable, cost-effective alternative to BAK4 prisms. 
Key Features & Applications: 
  • Imaging Function: Reverts and inverts the image, crucial for erecting systems.
  • Beam Steering: Bends the line of sight at a
    90∘90 raised to the composed with power
    90∘
     angle.
  • Applications: Commonly used in spotting scopes, binoculars, and high-precision instruments.
  • Material: N-BK7 is an environmentally friendly (RoHS compliant) variant of BK7 glass, noted for its high-quality, bubble-free performance in visible light. 
Performance Considerations: 
  • Light Transmission: While excellent in the visible spectrum, BK7 prisms can have lower, slightly dimmer light transmission (approx.
    83
    %
     to
    99
    %
    ) compared to superior quality BAK4 glass.
  • Contrast: Lower magnification options often produce better contrast, whereas high-magnification, budget-oriented N-BK7 optics may produce softer images.
  • Coatings: Coatings (such as AR coating or metallic mirrors) are often applied to the roof surfaces to optimize transmission, as they can be uncoated or rely on total internal reflection. 
Common Specifications: 
  • Surface Quality: Typical spec is
    6060
    60
    -
    4040
    40
     scratch-dig.
  • Angle Tolerance: Generally within
    ±2plus or minus 2
    ±2
     arcminutes.
  • Design: Often features a
    90∘90 raised to the composed with power
    90∘
     roof angle, where precision is critical for image quality.     
Note: For the highest performance, especially regarding edge-of-field brightness, BAK4 is generally preferred, but N-BK7 offers exceptional value for many applications. 
  • Thorlabs · Roof Prism
    Applications. Thorlabs' Roof Prism is made from N-BK7, an RoHS compliant version of BK7, and can be used when a right angle deflec...
    Thorlabs
  • Roof Prisms - 宏惠
    Description : BK7 roof prisms revert and invert the image as well as bend the line of sight through a 90°angle. Ideal for use in s...
    宏惠光電股份有限公司
  • Right-Angle Prisms - Thorlabs
    ... N-BK7 is a viable choice for UV applications down to 350 nm. For applications that demand maximum transmission, please see our...
    Thorlabs
Show all
  • Thorlabs · Roof Prism
    Applications. Thorlabs' Roof Prism is made from N-BK7, an RoHS compliant version of BK7, and can be used when a right angle deflec...
    Thorlabs
  • Roof Prisms - 宏惠
    Description : BK7 roof prisms revert and invert the image as well as bend the line of sight through a 90°angle. Ideal for use in s...
    宏惠光電股份有限公司
  • Right-Angle Prisms - Thorlabs
    ... N-BK7 is a viable choice for UV applications down to 350 nm. For applications that demand maximum transmission, please see our...
    Thorlabs
  • N-BK7 Right Angle Prisms - Edmund Optics
    TECHSPEC® N-BK7 Right Angle Prisms are made from precision N-BK7 for use in a variety of visible light applications. Right angle p...
    Edmund Optics
  • Amici Roof Prism BK7 equiv 15mm aperture - Knight Optical
    Need a custom specification? ... Amici Roof prisms also known as “Dach Prisms” or “Dachkanten Prisms” have two sections that meet ...
    Knight Optical
  • 30mm, Uncoated, N-BK7 Right Angle Prism - Edmund Optics
    Physical & Mechanical Properties * Dimensional Tolerance (mm): ±0.1. Bevel: Protective as needed. * Length of Hypotenuse (mm): 42.
    Edmund Optics
  • BK7 Optical Glass Roof Prism - Yutai Optics
    What are the core features of roof prisms? Image orthogonality: maintains the left-right and up-down orientation of the image in l...
    Yutai Optics
  • BK7 prism binoculars. Which ones to chose
    Nov 14, 2017 — hello viewers thank you for tuning in and today we're going to have a quick chat about BK7 prism binoculars and which ones you sho...
    1:49
    YouTube·Northern Optics
  • BAK 4 or BK 7 Prism - Which Prism Performs Better?
    Jun 13, 2020 — they don't they don't know which binocular optical instrument to buy i will try you to try to explain to you all these things in t...
    4m
    YouTube·Binoculars Guides
  • Get to know - #4 Bak4 & Bk7 - USCAMEL Optics
    Feb 14, 2022 — It depends. Generally, Bak4 light transmission can reach 99%, Bk7 light transmission rate is about 83%. That is why you may see so...
    USCAMEL Optics
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Web results

Roof Prism


Thorlabs
https://www.thorlabs.com › roof-prism
Thorlabs
https://www.thorlabs.com › roof-prism
Thorlabs' Roof Prism is made from N-BK7, an RoHS compliant version of BK7, and can be used when a right angle deflection of an image or laser beam is required.Read more
€64.99 · 4-day delivery · 30-day returns

Amici Roof Prism BK7 equiv 23mm aperture


Knight Optical
https://www.knightoptical.com › stock › amici-roof-pris...
Knight Optical
https://www.knightoptical.com › stock › amici-roof-pris...
Amici Roof prisms also known as “Dach Prisms” or “Dachkanten Prisms” have two sections that meet at 90°. Roof prisms rotate a beam by 90° and at the same ...Read more

20mm, Uncoated, N-BK7 Right Angle Prism


Edmund Optics
https://www.edmundoptics.com › 20mm-uncoated-n-bk...
Edmund Optics
https://www.edmundoptics.com › 20mm-uncoated-n-bk...
TECHSPEC® N-BK7 Right Angle Prisms are made from precision N-BK7 for use in a variety of visible light applications. Right angle prisms are generally used to ...Read more
$71.50 · In stock · $9.99 delivery · 30-day returns
Missing: roof ‎| Show results with: roof

Roof Prisms


宏惠光電股份有限公司
https://www.unice-eo.com › optics › prisms_1963 › roo...
宏惠光電股份有限公司
https://www.unice-eo.com › optics › prisms_1963 › roo...
Description : BK7 roof prisms revert and invert the image as well as bend the line of sight through a 90°angle. Ideal for use in spotting scopes ...Read more

BK7 Optical Glass Roof Prism


Yutai Optics
https://www.ytoptics.com › prisms › bk7_optical_glass_r...
Yutai Optics
https://www.ytoptics.com › prisms › bk7_optical_glass_r...
What are the core features of roof prisms? Image orthogonality: maintains the left-right and up-down orientation of the image in line with the original.Read more

T-PS951 - 15 mm Clear Aperture Roof Prism (A=18 mm, B= ...


Fosco Connect
https://www.fiberoptics4sale.com › products
Fosco Connect
https://www.fiberoptics4sale.com › products
Roof Prism is made from N-BK7, an RoHS compliant version of BK7, and can be used when a right angle deflection of an image or laser beam is required.Read more
$106.00 · In stock · $6.50 next-day delivery · 30-day returns

Are BK-7 prisms that inadequate or inferior?


BirdForum
https://www.birdforum.net › ... › Binoculars
BirdForum
https://www.birdforum.net › ... › Binoculars
May 27, 2015 — Binoculars crafted with BK-7 glass aren't useful and in fact are inadequate in transmitting a quality image to the human eye.Read more

Right-Angle Prisms


Thorlabs
https://www.thorlabs.com › right-angle-prisms
Thorlabs
https://www.thorlabs.com › right-angle-prisms
... N-BK7 is a viable choice for UV applications down to 350 nm. For applications that demand maximum transmission, please see our AR-coated N-BK7 prisms below.Read more

N-BK7 Corner Cube Retroreflectors Prisms


UNI Optics
https://www.uni-optics.com › Optical Prisms
UNI Optics
https://www.uni-optics.com › Optical Prisms
Cube corner prism has three mutually perpendicular surfaces and a hypotenuse face. It operates on the principle of total internal reflection (TIR).Read more

OEM Roof Prism, Roof Prism Manufacturer


Betensh Optics
https://www.betenshoptics.com › roof-prism
Betensh Optics
https://www.betenshoptics.com › roof-prism
BK7 And Fused Silica Glass Roof Prisms · High Precision Coated N-BK7 and Fused Silica Roof Prisms. The roof prism is a type of prism with two mutually ...Read more
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    Newport
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    10mm VIS 0° Coated, N-BK7 Right Angle Prism (Leg Coated)
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