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Jun 5, 2020 — Fresnel lenses are named after the French physicist who invented them sometime around 1818 for use in lighthouses.

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by WD Reeve · Cited by 2 — Polarizations of celestial radio waves are discussed in section 4. The electric field vector of a radio wave with elliptical or circular polarization rotates.

The idea is to use C-mount lenses on a double8 camera for longer focal lengths and cover the wide angles with normal d-mount lenses so that I can avoid purchasing double lens sets for longer focal lengths and can make extreme telephoto shots with the 8mm cameras of very long telephoto focal lengths which are not available in d-mount.

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Yes, I measured mine and it looks (from my calipers at least) to be correctly made.  I a list of flange focal distance figures to use from this chart: https://en.wikipedia.org/wiki/Flange_focal_distance

I don't have a standard C-Mount lens to test yet, but I did measure it and it will likely work. I got these numbers off the internet, not sure how correct they are.

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I just bought the same adapter off of eBay a few weeks ago.  I will try to post an update once I have taken some footage using it on my Bolex B8 handheld.

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It's wide range of magnifying glasses include, magnifying glass with light, eclipse glasses, kids magnifying glasses, dome magnifiers, reading magnifiers, hand ...

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I don't have a standard C-Mount lens to test yet, but I did measure it and it will likely work. I got these numbers off the internet, not sure how correct they are.

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I found a 75mm Yvar and it works great on my H8 non-REX with the adapter I got off e-bay.  For those that don't use 8mm, the lens is useable on that camera because the H8 Octameter has a 75mm setting.

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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After servicing the helicoid, it was easy to re-assemble the lens so the index marks were in the correct positon with the adapter in place. For this camera I want the index marks of all the lenses on the left side.

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.

I remember seeing pictures of such adapters on old hobby camera books but cannot find anything available for sale right now. If you know some place selling them, can you link it here?

When using CO2 lasers, resonator gases are used for creating the laser beam. Helium is used for cooling, Nitrogen is used for improving the performance, and CO2 ...

Anti reflective coatingiPad

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.

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.

It should be easily possible to use C-mount lenses on a D-mount camera with an adapter but finding such an adapter seems to be extremely difficult and I don't want to go through the hassle and expense of getting one custom made. It is weird nothing seems to be available for sale because this kind of adapter is very useful with 8mm cameras.

20161013 — Antireflection coatings are the most common coatings used in the world, with performance possibilities and limitations dictated by a number of key optical ...

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This is not my picture, I found it on the internet. But it does show what I have in mind. You can see the adapter on this one is a vintage piece. Though I can't make the letters other than U.S.A

TECHSPEC 25mm and 30mm Cage System Adjustable Optical Mounts are ideal for beam steering applications are available at Edmund Optics.