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If a piece of equipment changes the shape of this sine wave, or any signal, then distortion is created. Distortion generates additional frequencies that were not present in the original signal. Sometimes distortion can add 'warmth' often it is distinctly unpleasant.

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by BR Masters · Cited by 22 — Back home in India, Raman and his students observed the frequency shift of scattered light. They knew the phenomena was not Rayleigh scattering, since that type ...

Steve Mower - Updated July 29, 2024 Please Note: Mojo BluFilter Standard AR is discontinued. Choose Mojo UV+HEV+IR AR instead. Anti-Reflective Coatings (AR) Better Optical Quality and Appearance All quality lenses whether in telescopes, binoculars, and your smart phone's camera, have an anti-reflective coating. There is no such thing as 100% non-glare lenses but anti-reflective coatings for eyeglasses reduce reflections and glare. They look nicer and you get clearer vision. Anti-Reflective (AR) Coatings, or "Non-Glare" coatings are designed to increase the optical quality of lenses by "pulling" more light through the lenses. Typically, standard, non-blublock AR coatings pull over 99.95% of light through the lens.  A lens without AR will typically reflect off about 20% of the light hitting it. For eyeglass lenses this can look unsightly as people can see a lot of reflections off the front surface of the lenses. AR coated lenses look almost totally clear with very little reflection. How do you know if a lens has an AR coating? If you look at the lens straight on it will look very clear. Held to a slight angle you will see a shimmer of color. The color can be a mix of blue, green, yellow, purple depending on the combinations of minerals used in the AR stack. An AR stack is is the multiple layers of coatings that "pull" the light through the lens. Different manufacturers have their own AR stacks.  High quality AR coatings also have other layers of coatings that make the lenses more scratch resistant, block more UV, and make the lenses less easy to smudge and easier to clean (hydrophobic coatings). About Zoom meetings and lighting. A standard AR coating works best. Certain lights like ring lights can cause visible reflections. You can reduce this either by repositioning the light source or switching to a fluorescent light. Our best lenses for Zoom meetings: Mojo Standard AR Mojo UV-HEV-IR AR - New! Crizal Rock BluFilter Standard AR Mojo 1.67 Ultrathin Standard AR   ANTI-REFLECTIVE LENS TYPES   Standard AR Coatings Pull over 99.95% of light through the lens to your eyes. Cosmetics: Lenses are very clear with no surface glare. Lenses: Mojo Standard AR   BluBlock AR Coatings Specially designed to reflect off a percentage of blue light before entering the lens.  Allows beneficial blue light through to your eyes. Reduces reflections and unwanted glare. Cosmetics: A blue flash off the front surface of the lenses can be seen. This is blue light being reflected off. Lenses: Mojo BluBlock AR, Apex BluBlock AR-T, Crizal Prevencia AR       Blue Filter Lenses with Standard AR Coatings Lenses have a blue filter monomer which filters a percentage of HEV Blue Light. Standard AR Coating does not reflect off blue light. Allows beneficial blue light through to your eyes. Reduces reflections and unwanted glare. Cosmetics: No blue flash off the front surface of the lenses can be seen.  Great for video meetings. Lenses: Crizal Rock, Crizal Rock 1.67, Mojo UV-HEV-IR AR       Blue Filter Lenses with BluBlock AR Coatings (Hybrid) Lenses have a blue filter monomer which filters a percentage of HEV Blue Light. BluBlock AR Coating reflects off blue light. Allows beneficial blue light through to your eyes. Reduces reflections and unwanted glare. Cosmetics: Blue flash off the front surface of the lenses can be seen.  Provides superior blue light protection. Lenses: Zenspex 1.6 BluBlock AR, Kodak Total Blue 1.6 AR  Go here to see a video showing the relative effectiveness of these blublock lens types. Blue light reflected of of BluBlock AR Coatings can be seen: Our Lenses with AR Coatings BLUBLOCK AR LENS NAME  ~TOTAL HEV    BLUE FLASH    OPTION $ Mojo BluBlock AR ~25% YES $15 Apex BluBlock AR-T ~33% YES $20 Zenspex BluBlock 1.6 AR ~80% YES $50 Kodak Total Blue 1.6 AR ~80% YES $80         STANDARD AR LENS NAME ~TOTAL HEV BLUE FLASH OPTION $ Crizal Rock BluFilter Standard AR >20% NO $100 Mojo Standard AR 0.0% NO $15 Mojo Ultrathin 1.67 Standard AR 0.0% NO $60 Mojo UV-HEV-IR AR ~70% NO $60   See our AR Lenses Specifications Read our BluBlock Guide for help in selecting the right blue block option option for you.    Steve Mower is a licensed dispensing Optician and creator of Mojo BluBlock Tints. Steve has over 30 years experience in the optical field. He has been a optical retail manager and has consulted on progressive lens development. Steve has been offering unique reading glasses solutions on-line since 2010. Steve is a member of Opticians Association of Virginia and Opticians Association of America.

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I would liken this to a funfair hall of mirrors. When you stand in front of a flat full-length mirror, you get an accurate reflection of what you look like. But a funfair mirror bends and distorts the reflection in all kinds of ways. The funfair mirror is bent, which causes the distortion of the image. We can call the flat mirror 'linear', meaning a straight line. The funfair mirror is 'nonlinear', causing distortion.

So now we know that linear means undistorted, nonlinear means distorted. So how come there is such a thing as linear distortion? Surely that is a contradiction in terms?

Adventures In Audio is a website by Audio Masterclass. Audio Masterclass helps students around the world learn music production and sound engineering online in their own home recording studio, with tutor support and assessments of their practical assignment projects leading to an Audio Masterclass certificate on successful completion.

Firstly, what is distortion anyway? Distortion is any change in the shape of a signal's waveform. So to take an example, the waveform might be a simple sine wave, which is the simplest sound you can possibly get, consisting of only one frequency.

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Zur numerischen Charakterisierung der normalen Flachheit von kohärenten Garben. Author(s) -. Herrmann Manfred,. Vogel Wolfgang. Publication year - 1973.

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This is a puzzle that came my way recently. A colleague asked me what the difference is between linear and nonlinear distortion?

Linear and nonlinear distortion are features of every item of sound equipment ever invented, even digital. It's important to know the difference, and whether either sounds better or worse.

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"Hmm...", I said, "Distortion is inherently a nonlinearity imposed on the signal, so there can be no such thing as linear distortion". Well maybe I wasn't quite right about that, but it is a matter of terminology rather than science.

Steve Mower is a licensed dispensing Optician and creator of Mojo BluBlock Tints. Steve has over 30 years experience in the optical field. He has been a optical retail manager and has consulted on progressive lens development. Steve has been offering unique reading glasses solutions on-line since 2010. Steve is a member of Opticians Association of Virginia and Opticians Association of America.

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Well I took a look into this and I found that some people use the term 'linear distortion' to mean any change to the signal that doesn't change the shape of the individual sine wave components of a signal.

About Zoom meetings and lighting. A standard AR coating works best. Certain lights like ring lights can cause visible reflections. You can reduce this either by repositioning the light source or switching to a fluorescent light.

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The excitation filter is placed within the illumination path of a fluorescence microscope and filters out all wavelengths of the light source except for the ...

It's super helpful especially for laser alignment. You can see the red dot move when adjusting your mirrors or when moving the axis. It also ...

David Mellor is CEO and Course Director of Audio Masterclass. David has designed courses in audio education and training since 1986 and is the publisher and principal writer of Adventures In Audio.

This could mean an irregularity in the frequency response, or it could mean a change in the relative phase (timing) of the various frequencies. It can make the individual sine wave components bigger or smaller, or shift them in time, but it doesn't bend them. It is only when the sine wave components of the signal are bent that the distortion is nonlinear.

To be honest, I think this is confusing. We can discuss frequency response and phase problems all day without describing them as distortion. So in my book, distortion only ever means changing the shape of the individual sine wave components of the signal, and it is always nonlinear.

Radius of curvature (R1 in mm). Index of refraction of the surrounding medium (n0):, Radius of Curvature (R2 in mm). Focal Length (in mm):. Thin Lens Equation ...

All quality lenses whether in telescopes, binoculars, and your smart phone's camera, have an anti-reflective coating. There is no such thing as 100% non-glare lenses but anti-reflective coatings for eyeglasses reduce reflections and glare. They look nicer and you get clearer vision.