Jump to a section. Nikon Z mount lens infrared performance; Nikon F-mount lens infrared performance. IR Performance: Nikon Z-Mount Lenses. We tested the ...

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A solar concentrator using Fresnel lenses is called a Fresnel lens solar concentrator. It takes a large area of sunlight and directs it towards a spot by ...

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You can't focus an object space telecentric lens to infinity. An object space telecentric lens holds magnification constant regardless of subject distance. If you could focus such a lens to infinity (or thereabouts) then you could just point it at the moon and get closeup images of Neil Armstrong's footprints.

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There is also a limit to how close a lens can focus. Macro lenses are normally able to focus up closer than other lenses. I am unsure about the final question about if there is a depth at which the image would resolve, but I am fairly sure that the answer is yes, it simply does not line up with the position of the sensor.

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So when I fully extend the telecentric lens (specifically http://computarganz.com/file.cfm?id=167) it is focused at infinity. I interpret this as it being being able to image an object at a distance of infinity and produce an image focused at the CCD behind the lens.

Oct 17, 2024 — Raman scattering is perhaps most easily understandable if the incident light is considered as consisting of particles, or photons (with energy ...

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When focussed at infinity objects far enough away for the light rays to reach the lens almost parallel will form a focussed image at a distance of f behind the lens, where f is the focal length. Objects closer than that will form a focussed image behind the sensor (if the sensor wasn't in the way) and will thus form a blurred image on the sensor as each point of light from the object gets spread out.

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Jul 15, 2015 — sagittal-astigmatism Canon EF 28mm f/1.8 USM Aberrations. Chromatic aberration and monochromatic aberration are the two main types of aberration ...

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Rotating the lens to focus closer simply moves the lens further from the sensor, so the closer object now forms a focussed image on the sensor.

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I have a question about a telecentric lens Ive been studying (for physics research!) and was wondering if you guys could help clear some cobwebs in my head. For starters, I am simplifying the TC lens as a compound lens. Also, this lens has 2 degrees of freedom: (1) it can be extended and retracted (2) it can rotate (I believe rotating the lens changes its f# e.g. aperature).

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An aperture of f/8 (8.0) is about the middle of the range on this lens, which is wide open at f/4 but stops to f/22. f/8 is likely the lens's ...

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Continuing, if I placed an object at some distance in front of the lens (not equal to infinity), I could create a focused image of the object at the CCD by retracting the lens until I see a focused image at the CCD.

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Real object space telecentric lenses have a limited range of focus distances at which the lens can produce focussed images, called the "telecentric depth". As most such lenses are designed for assembly line machine vision applications and can only focus on objects a few tens of centimetres away.

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Infinity focus is an object beyond the infinite focus point for the lens. When the focal point is set at infinity, anything at or beyond that point will be in focus, things which are closer than that point will not be.

I the datasheet you link to looks like a regular close focus lens. It is possible that it is an image space telecentric lens. This just means the rays exit the lens perpendicular to the sensor and magnification doesn't change if you focus by moving the lens assembly.