MTF

To cater to various imaging systems and applications, Avantier MTF offers versatile options for its target objects, allowing users to choose between a single slit, a cross (two perpendicular slits) for simultaneous two-directional MTF measurement, or a pinhole target, which provides information about the Point Spread Function (PSF) containing complete MTF information in all image directions.

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Polarisers can be rotated. It's worth pointing out that you can also use them for increasing the visibility of reflections by rotating them such that the polarised reflection passes through the filter completely while non-polarised light gets reduced by half in comparison.

So is it possible to get rid of these glass reflections by using polarizers? Is there a difference between regular polarizers that if what i heard is correct change the picture as you tilt the camera (just like how twisting polarized sunglasses makes the digital displays go black) and the circular polarizers when it comes to this?

This being the case, when photographing objects behind glass, we can mitigate impairing reflections by mounting a polarizing filter and rotating it so that annoying reflections are rejected.

With a commitment to technological leadership, Avantier MTF aims to contribute significantly to the production of future mobile phone camera lenses and photolithographic optics. Its advanced MTF measurement capabilities facilitate a better understanding of the behavior of optical systems at higher spatial frequencies, providing invaluable insights into image quality and helping researchers and engineers in designing and optimizing optical systems.

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From a mathematical standpoint, Avantier MTF uses Fourier synthesis, treating the single slit as a sum over all spatial frequencies to calculate the MTF curve. Each spatial frequency contributes to the slit with the same amplitude (=1), and through this process, Avantier MTF can assess the modulation transfer function (MTF) of the sample. However, it takes into account factors such as diffraction and aberrations, which result in broadening the slit image, represented by the Line Spread Function (LSF).

I wonder if the same polarizer filters we use for making the underwater look clear instead of the sky reflections blurring the water can be used for that situation.

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You can suppress reflections on glass fronts pretty well if they result in polarised light. That tends to be the case completely when the reflection on the glass surface occurs at "Brewster's angle", an oblique angle. So roughly speaking you need to shoot "half sideways" at the glass reflection for best effect.

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ImageJMTF

Microscope Notes · The eyepiece, also called the ocular lens, is a low power lens. · The objective lenses of compound microscopes are parfocal. · The field of view ...

FOV and focal length

In pursuit of providing comprehensive solutions for image quality testing, Avantier MTF also recognizes the importance of both on-axis and off-axis MTF measurements. On-axis measurement involves testing the MTF along the axis of symmetry, while off-axis measurement is carried out by moving the target in the image plane and adjusting the image analyzer accordingly. This approach ensures a thorough evaluation of optical systems, capturing performance characteristics at various spatial frequencies and cut-off frequencies.

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Avantier MTF (the Modulation Transfer Function) is a new and innovative entrant in the field of MTF measurement technology, offering state-of-the-art solutions for evaluating the imaging performance of optical systems. Similar to modern MTF Testers like the ImageMaster®, Avantier MTF employs a measuring system that utilizes a single illuminated slit on an opaque background as the object for MTF testing.

Moreover, Avantier MTF acknowledges the significance of pixel resolution and high resolution in modern imaging technologies. It focuses on addressing challenges related to smartphone camera optics, under-display camera technology, and lens design to deliver cutting-edge measurement technologies that meet the demands of the industry.

Shown in The Mighty Circular Polarizing Filter Explained in Pictures which also explains the theory behind polarizing filters.

Modulation transfer function

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LensMTF

The measuring system of Avantier MTF accommodates MTF measurements at a single wavelength or within a spectral range covering a finite band of wavelengths, providing monochromatic or polychromatic MTF values, respectively. This flexibility ensures accurate assessments of image quality across different optical systems and under varying conditions.

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Yes. Here's an example image with very similar conditions to the post you linked to. In this case they are using a circular polarizing filter:

The Avantier Metrology service using TriOptics MTF Test Station is a cutting-edge testing system designed to evaluate the imaging performance of optical systems. Using the Modulation Transfer Function (MTF) principle, this station objectively and quantitatively assesses the resolution and quality of lenses. By analyzing the relative image contrast divided by relative object contrast, it calculates the MTF at various spatial frequencies and field of view positions. The system employs advanced techniques like Fourier analysis, utilizing single slits, crosses, or pinholes as test targets to determine the MTF accurately. Whether in finite-finite or infinite-finite imaging conditions, the Avantier Metrology service provides crucial data for optical and systems designers, enabling them to predict and compare the performance of optical systems effectively. Please contact us if you’d like to schedule a free consultation or request for a quote on your next project.

The Fourier analysis of the Line Spread Function enables Avantier MTF to determine the contribution of each spatial frequency to the LSF, and the amplitude of each frequency corresponds to the contrast at that specific frequency. This comprehensive analysis of the MTF testing process allows Avantier MTF to provide accurate and reliable results for evaluating image quality and optical performance.

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CPL filters do not differ in their photographic properties from linear polarisers; they are merely friendlier to metering and autofocus. But in essence they are just linear polarisers with a quarterwave plane behind them that converts the passing linearly polarised light to circularly polarised light which some parts of a camera are better equipped to deal with.

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Light reflected from non-conductive surfaces such as glass undulate mainly in one plane. When first studied, scientist falsely concluded that light waves must have a north and south pole, like a magnet. While false, the term polarized and un-polarized stuck. When light rays are reflected from the polished surface of glass windows and showcases, it will likely be polarized. Polarizing filters pass light waves that vibrate in a single plane and block light waves that vibrate in opposing planes. Consider a jump rope passed through a fence with a missing picket. The jump rope when plucked only vibrate up/down and not side-to-side.

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Light travels following a wavelike path. Water waves on a pond travel in a similar manor however, water waves undulate up/down whereas light waves freely vibrate in every possible plane. Such light wave behavior is said to be un-polarized. When light waves are reflected from some surfaces, they often become polarized. Polarized light wave vibrate however the direction of their undulation is altered.

Chromatic Aberration. HIA Full. Chromatic aberration results in misalignments and other distortions between different channels in a microscope image. It can be ...