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We plot the acutance as a function of the radial field position, taking into consideration horizontal and vertical directions. We make measurements for several focal lengths and aperture values.

there are 2 types of lenses , one which converge the light , they are called convex lenses. and the one lens which disperses is called concave ...

For the DxOMark sharpness score, we compute MTF in horizontal and vertical directions by examining the spatial response of the camera to a perfect edge. This measurement follows ISO standard 12233.

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I actually found the best real world use for them was watching firework displays, as these rarely last more than 10-15 mins and the effect is ...

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The value of the MTF at frequency 0 is always 100% since a flat field is considered to have been reproduced perfectly, with no intensity loss. Attenuation due to lens transmission is measured separately.

View the MTF average test results measured by the ultra-high precision Trioptics Imagemaster MTF bench. Compare the MTF results various lenses.

For all our meters with SMA sockets, a polymer optical fiber is needed to transfer excitation light to the sensor and the sensor response back to the meter.

38.1. 1 1/2. 190.5. 7 1/2. 41.3. 1 5/8. 203.2. 8. 44.5. 1 3/4. 228.6. 9 ... To convert Centimetres to Inches multiply by; 0.3937 mm to Inches; multiply by; ...

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Because of field aberrations (such as field curvature), the value of the limiting resolution and acutance depends on the field position.

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An objective measure of sharpness which takes into account the sensitivity of the human visual system to specific spatial frequencies and the viewing distance of an image. Edge acutance refers to the ability of a photographic system to show a sharp edge between contiguous areas of low and high illuminance. Texture acutance refers to the ability of a photographic system to show details without noticeable degradations.

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Aug 19, 2024 — Lasers are categorized into thousands of types based on the lasing medium they use. The main categories—gas, liquid, solid-state, ...

The DxOMark score for Sharpness is based on the Perceptual Megapixel (P-Mpix) concept that weights the Modulation Transfer Function (MTF) of the lens with the human visual acuity. Read more about Perceptual Megapixels.

Sharpness is based on the MTF measurement. Let’s start with a practical measurement experiment to help describe what MTF is. If we look at a series of black and white stripes with varying spatial frequency and fixed contrast (same reflectance ratio between black and white, independent of the spatial frequency), we can see that the image of high-frequency stripes has a lower contrast than that for low-frequency stripes. For very high frequencies, the image eventually becomes (almost) uniform, with an intermediate level between black and white, which our eyes perceive as a shade of gray.

Cylindrical Microlens Arrays are used to homogenize a variety of light sources, including lasers or high power LEDs. Unlike Square Microlens Arrays, which generate spot patterns, Cylindrical Microlens Arrays yield non-gaussian line patterns, and are ideal for welding, drilling, or laser ablation applications from the UV to IR. Cylindrical Microlens Arrays are available uncoated, VIS-NIR, or UV-NIR coated.  Additionally, these lenses can be used as fast axis collimators.

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DSLR lenses usually have a radial symmetry, which means that field dependency can be summarized by the MTF at different distances to the image center.

A diffraction grating is essentially a multi-slit surface. It provides angular dispersion, i.e., the ability to separate wavelengths based on the angle that ...

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Sharpness is a subjective quality attribute of an image or a lens. Sharpness indicates the visually perceived quality of details of an image or details reproduced by a lens. It is associated with both resolution and contrast of reproduced details (within an image or by a lens).

We map the acutance on a color scale as a function of focal length and aperture value. We make measurements for several field positions.

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The MTF precisely describes the contrast attenuation: for each spatial frequency, the MTF plots the ratio of the output modulation versus the test object modulation.

The resolution of a camera is defined by the size of the smallest detail that the camera can optically discriminate. ISO standard 12233 defines the limiting resolution as the first frequency such that the contrast attenuation is 95% (hence a MTF value of 5%). In practice, this value is very small and is also sensitive to measurement noise