Best NDfilter calculatorapp

With a circular pol, the quarter wave plate on the rear of the polarizer spins the light before it enters the camera lens so that it doesn't get cross polarized on any reflective surfaces in the system, such as  the partial mirror in a video tap or a DSLR mirror.

Parallel light incident on one side of a converging lens passes through a single point on the other side called the focal point.

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We have motorized linear stages having just 5 mm traverse to 1000 mm traverse with varied specifications with respect to load capacity, drive mechanism, ...

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The main problem that the circular polarizer addresses is cross polarization on other reflective surfaces in your system such as mirrors and beam splitters. Reflective surfaces polarize light . . . which is why a polarizer can reduce or eliminate those reflections.  If you have a mirror or other reflective surface inside your camera, a linear polarizer can cross polarize the reflected image and possibly black out the image.

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Our Rota-Pol a circular polarizer made to fit in 4"x5.65" cine matte boxes and allow quick and easy rotation by hand or with a motor:

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Filter By: · Package/Feature · IR Emitter or LED · Output - CW or Pulsed · Output Reflector · Window/Filter · IR LED Wavelength · QCL.

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Polarizers used in cinematography are often inserted in a matte box so there's an opportunity to insert a circular pol backwards and it doesn't polarize when inserted incorrect.

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by K Kaur · 2023 · Cited by 2 — The amount of light refracted through the prism depends on the power of the prism defined in prism diopters. Prisms play an essential role in orthoptics and are ...

The classic problem in 35mm film production was the video tap. Using a linear polarizer on a film camera with a video tap, could and often would cause the video feed to go dark because the partially silvered mirror in the video tap would get cross polarized.  A very similar cross polarization is used to create Variable Neutral Density Filters with ND values between ND 0.6 (2 Stops) and ND 2.4 (8 stops).  8 stops means that only about 0.39% of the light gets past the filter.   A Neutral Density Filter with an ND Value of ND 2.4 can be used to allow opening the aperture in a lens for shallow depth of field, or slow a shutter for various effects . . . it is not a good thing to do accidentally in an optical system with a mirror.

Circular polarizers for cinematography are marked to show proper orientation, but mistakes happen.   If you have no mirrors or reflective surfaces in your system, such as a mirror or a beam splitter . . . then the Linear-Pol will not cause you any trouble and you can’t put it in the matte box backwards, which might save you some time and trouble.

In still photography, SLR cameras and DSLR cameras have a mirror, which a linear polarizer can cross polarize, causing the image to darken or go black.

Collimated beams are light rays that are parallel to each other, maintaining their direction and minimizing divergence over distance.

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The short answer is that both Linear and Circular Polarizers do the same thing. The actual polarization effects such as reducing reflections on glass surfaces, increasing color saturation in foliage, darkening a blue sky are the same with both Linear and Circular polarizers.

Circular Polarizers contains a Linear Polarizer component that does the main work of polarization, as well as a second layer inside the filter called a Quarter Wave Plate, which “spins” the light after it goes through the linear layer and before it enters the camera lens.

Lindsey Optics offers both circular and linear polarizers in professional cine sizes in 4.5" Round Drop-In, 138mm Round Drop-In, and 4"x5.65" and Rota-Pols in 4x5.65" and 6.6x6.6" all with anti-reflection coating.

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Here’s how the theory works…For each stop of light blocked by the filter, the shutter speed doubles in duration.Let’s check out an example: If your shutter speed is 1 second (base or normal exposure) for a scene without an ND filter, then using a 3 stop ND filter will require an 8-second shutter speed to achieve the same exposure: 1 second (original shutter speed) x2^3 = 8. You may have noticed that the value needed to multiply your original exposure follows one of the naming systems of ND filters. In the above example, a 3 stop ND filter is also called an ND8.Let’s go through another example using a 6 stop filter. If your shutter speed without the filter is 1 second, you will require a 64-second shutter speed to achieve the same exposure: 1 second X2^6 =64. Note that a 6 stop ND filter is called an ND64 filter.Most DSLR cameras can calculate exposure times up to 30 seconds and some mirrorless cameras up to 60 mins with an ND.  If the target exposure time is over the limit your camera will calculate, you can use an app to help.Most of us are not math geniuses so there’s an app to calculate your exposure times when using ND filters.

The linear polarizer element in a circular polarizer needs to be out front, pointed at the world, with the quarter wave plate on the rear side, the camera lens side. A circular polarizer doesn’t work if you get it in backwards. With a screw-in filter that’s no issue, there's only one way you can screw it on the lens..

When polarized light is incident on a surface, it is often described in terms of perpendicular and parallel components. These are orthogonal to each other and ...

by W Huang · 2023 · Cited by 5 — This work discusses the single-intensity and difference-intensity detection schemes for lossy Mach–Zehnder Interferometer (MZI) and gives the corresponding ...

With CPL and GND filter in place (if required) use the cameras light meter and the histogram to get a perfectly exposed shot.  Once you have this base shutter speed it’s time to get the NiSi App and input this and select the ND filter to get to the target shutter speed.

So if you are asking the question:  "Do I need a circular or linear polarizer?", we hope we've given you enough information to make that decision.

With drop-in filters, rectangular filters and Rota-Pols for cine matte boxes, circular polarizing filters are labeled with “this side out”.