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How filters work. ND. The main feature of ND filters is their ability to give you control on the shutter speed. ND filters come in wide range of values, from ...

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In daylight, the human eye is exposed to long wavelength ultraviolet radiation (UVR), visible radiation and short wavelength infrared radiation (IRR). Almost all the UVR and a fraction of the IRR waveband, respectively, left over after attenuation in the cornea, is absorbed in the lens. The time delay between exposure and onset of biological response in the lens varies from immediate-to-short-to-late. After exposure to sunlight or artificial sources, generating irradiances of the same order of magnitude or slightly higher, biological damage may occur photochemically or thermally. Epidemiological studies suggest a dose-dependent association between short wavelength UVR and cortical cataract. Experimental data infer that repeated daily in vivo exposures to short wavelength UVR generate photochemically induced damage in the lens, and that short delay onset cataract after UVR exposure is photochemically induced. Epidemiology suggests that daily high-intensity short wavelength IRR exposure of workers, is associated with a higher prevalence of age-related cataract. It cannot be excluded that this effect is owing to a thermally induced higher denaturation rate. Recent experimental data rule out a photochemical effect of 1090 nm in the lens but other wavelengths in the near IRR should be investigated.

3mm 850nm Through-hole IR LED can be 0.1W, 0.2W, 0.3W, 0.4W ect. Different LED chip will make different watt. If we make the same LED chip in with the same 3mm ...

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Mar 18, 2014 — The way I got the aperture was to let the laser light pass through the lens onto a white screen and then keep the screen at a fixed distance ...

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Learn about Fused Silica (SiO2) optical material, ideal for UV, visible, and IR applications due to its high transmission and thermal stability.

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The objective magnification (M) is calculated by dividing the reference focal length (L) of the tube lens by the objective focal length (F). As the critical ...

Good things really do come in small packages. Fabulously fun and pleasantly powerfull, the IC0946 iComfort hand held massager uses high frequency vibration ...

Dover Motion offers a selection of direct drive and linear motor products with an accuracy more than 10 micrometers. Each linear stage can be modified and ...

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