"After 1960 new glasses with high refractive indices became available. The classical glass catalogue was filled with what we now call the “old glass types”, essentially developed by Ernst Abbe. As these glasses had low refractive indices, one had to bend the lens elements quite strongly to get the type of correction needed. But such curved glass is sensitive to manufacturing tolerances and one could not accomplish all. So the search for new glasses started with the additions of rare earth elements."

Along w/ compensating for other abberations a designer will reduce the maximum F stop (resolution) of a lens to the point where the resultant increasing contrast combined w/ the remaining resolution produces the best balance of image.

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Contrast resolution vsspatialresolutionin CT

I've shot targets with my Summilux as well for a review, but I can say quite safely just by taking pictures with it - it's an amazing lens regardless of adjectives. It's sharp, contrasty, has a high resolution, etc. They're all in there.

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In the real world contrast and resolution are not necessarily coupled. "contrast" refers to high modulation at the medium and lower frequencies, while "resolution" is to have at least some modulation at the very high spatial frequencies.

"After 1960 new glasses with high refractive indices became available. The classical glass catalogue was filled with what we now call the “old glass types”, essentially developed by Ernst Abbe. As these glasses had low refractive indices, one had to bend the lens elements quite strongly to get the type of correction needed. But such curved glass is sensitive to manufacturing tolerances and one could not accomplish all. So the search for new glasses started with the additions of rare earth elements."

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By manipulating and detecting nuclear spins in a tiny floating diamond, scientists have reported a record-long spin coherence time for a levitated system.

Contrast vs resolution vsimage

Working with another team, Edwards and Michel are already running experimental tests that suggest that plasma gratings with the required parameters can be built. “We are hopeful that these results will soon lead to a proof-of-principle demonstration of an all-plasma laser design,” Edwards says.

Erwin Puts has written a great deal of detailed information on this topic. Suffice it to say that there is more to it than meets the eye, and that Leitz has made very crafty decisions in lens design over the decades, favoring simpler designs with higher-index glasses that have fewer elements and elements with gentler curves.

Early on, design compromises were necessary that could be simplistically reduced to 'contrast vs resolution' (more elements reduced contrast but allowed more corrections), but it is more complex than that. Even with the latest glasses and anti-reflection coatings, compromises still are necessary, but they are very much less crude.

“Petawatt” lasers emit pulses whose power—for an instant—vastly exceeds the average power of the entire US electric grid. Such powerful pulses can be used to accelerate particles, create antimatter jets, and generate x-ray beams. Pulse damage of the optical components used in these lasers, however, limits the highest achievable power and makes these systems extremely bulky—the laser beams must have large widths to prevent damage. Now Matthew Edwards of Stanford University and Pierre Michel of Lawrence Livermore National Laboratory, California, theorize that high-power lasers could be built using optics made of plasma, which can withstand much-higher-intensity beams than conventional materials [1].

Contrast resolutionin MRI

Canon Objektivbezeichnungen erklärt: So liest man die Objektivbezeichnung · BAJONETT-TYP · RF- und RF-S-Objektive (z. · EF – Electronic Focus (z.B. Canon EF 85mm f ...

Oct 25, 2022 — 1. Definitions and Measurements. Political polarization refers to the cases in which an individual's stance on a given issue, policy, or person ...

Although this study has little relevance for photography with an M9, it does show that a very contrasty Leica lens like the Summilux 50/1.4 asph can have very high resolution, even at its full opening.

Combining analytical calculations and numerical simulations, Edwards and Michel show that a plasma grating could be created by shining low-power lasers onto a plasma to induce a small, periodic modulation in the plasma’s refractive index. The predictions indicate that such a grating would have a damage threshold over 10,000 times higher than that of a conventional grating. It could also enable the building of lasers with 100 times more power than current systems but with the same size.

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Contrast resolutionRadiology

Leica glass lab which was closed round 1995, developed special glasses that made possible the 1.0 Noct and 75 1.4. The Leica rep showed me a 1" cube of that stuff that was a reject. It weighed like it was solid lead.

Microscope Parts & Specifications · Eyepiece Lens: the lens at the top that you look through, usually 10x or 15x power. · Tube: Connects the eyepiece to the ...

Today, plasma optics, such as mirrors, are commonly used at petawatt laser facilities. But researchers have yet to demonstrate other components key to engineering a short-pulse plasma laser, including plasma gratings. Such gratings could substitute the solid gratings currently used to compress laser pulses and boost their peak power to petawatt levels.

I don't mean to quibble, but the color of the target might be diminishing the potential resolution due to its long wave.

Difference betweencontrastandresolutionin radiography

The focal length of a microscope objective is typically between 2 mm and 40 mm. However, that parameter is often considered as less important, since ...

At a distance of 10 meter a resolution test chart was mounted on a wall and the image produced by the Summilux was photographed with a Leitz Photar 12.5/2.4 at f/2.4 with a bellows extension of 220 mm. This creates an enlargement of the image plane of the Summilux of 17 times in the final image of the capturing camera.

According to Leslie Stroebel (View Camera Technique, Focal Press, page 116, figure 5-40), they are not necessarily couple, see here. A, B and C are different lenses with different design.

High and lowcontrast resolutionin radiography

According to Erwin Puts it is incorrect to assume contrast and resolution are opposing parameters. In general the lens with more resolution will exhibit more contrast.

Fresnel Lenses are used in many light collection applications, such as condenser systems or emitter/detector setups. Fresnel Lenses are optical lenses ...

In the photonic force microscope a small bead (∼1 μm) is optically confined by a focused laser beam, typically a Nd:YAG laser with a wavelength of 1064 nm.

The observation of a previously unseen photon delay in the production of quantum light has implications for the development of quantum technologies. Read More »

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Contrast resolution

This adapter is precision machined and anodized to be used with PL lenses on C-Mount cameras. It was Made in the USA.

Contrary to conventional wisdom, a lattice of engineered nanoparticles called meta-atoms can have a chiral optical response even when each meta-atom is not chiral. Read More »

One could wonder if (modern) Leica lenses would be optimized for contrast, if that would compromise resolution. To show that a good lens can satisfy both, the following experiment has been done with a Summilux 50/1.4 ASPH at f/1.4. The lens was mounted on an M6 of which the backdoor was opened and the shutter fixed to open.

A new recipe for making hydrogels delivers a material that is both flexible and semiconducting—desired properties for interfaces in implantable medical devices.

In principle you are right that long wavelengths reduce resolution. Thanks. But this was illuminated by a halogen lamp with lots of medium wavelength in it and the diffraction limit at f/1.4 is 1065 linepairs per mm (Rayleigh criterium) for green. The statement from my measurement is that the Summilux 50/1.4 asph resolves at least 500 linepairs per mm and that is still valid.

Contrast vs resolutionmicroscope

Early on, design compromises were necessary that could be simplistically reduced to 'contrast vs resolution' (more elements reduced contrast but allowed more corrections), but it is more complex than that. Even with the latest glasses and anti-reflection coatings, compromises still are necessary, but they are very much less crude.

A lens w/ a larger F stop will resolve more information than the same lens w/ a smaller F stop all else being equal. A lens w/ a smaller F stop will exhibit a higher degree of contrast than the same lens w/ a larger F stop all else being equal.

Erwin Puts has written a great deal of detailed information on this topic. Suffice it to say that there is more to it than meets the eye, and that Leitz has made very crafty decisions in lens design over the decades, favoring simpler designs with higher-index glasses that have fewer elements and elements with gentler curves.

Below the result: The Summilux reaches a resolution of at least 500 linepairs per mm. at f/1.4, which is 6.5 times more than the M9 sensor can resolve.

I was already wondering what ‘contrast versus resolution’ was supposed to mean, given that the resolution of a lens is commonly measured and expressed as the contrast delivered at certain spatial frequencies. So what you really referred to was ‘contrast at low and medium spatial frequencies versus contrast at high spatial frequencies’. And yes, quite obviously you can have both.

Michael, you are equating F-stop with resolution: the larger the opening, the higher the resolution, you state. That is true if the lens is diffraction limited at its widest aperture. For a perfect lens, the physics of the opening determines the resolution because of the, not the optics. But if the lens is perfect, there are no other aberrations and therefore contrast is also high.