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Home > Filters > Nebulae filters > OIII Filters > Astrodon > Astrodon Filters High-Performance 5nm OIII 1.25" narrow-band filter

Astrodon Filters High-Performance 5nm OIII 1.25" narrow-band filter

Product no.: 15076
Manufacturer: Astrodon

$ 540.00

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Product can be shipped as of 01.12.2019
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Product description:

In the case that this article currently is not available from the warehouse, please note the following: we order from this supplier in regular intervals. Please place your order now, so that we may take into account your order and deliver the article to you by the above-mentioned date. If you need the article earlier, we can rush it for you for an additional price. In this case, please contact our customer service department.

Please note that this product desciption was translated by a computer. For more information please contact our english speaking customer service.

Narrow-band filters achieve a contrast enhancement in emission nebulae, except that they can only nominate a member of the wavelength range of light to the spectral lines of hydrogen (Ha, 656nm), oxygen (OIII, 501 nm), sulfur (SII, 672nm), and so throughout. The filter can always be used for photography, even when the moon is in the sky, or as a filter against the light pollution in a major city. Here, the length of exposure time does not matter - can also be made long-term photography.

The narrow-band range of wavelengths than FWHM (English full-width at half-maximum intensity) is defined. Narrow-band filters reduce background noise. Therefore narrowband filters in the production are much more difficult and more expensive, because here are respected not only on the wave length range, but also to the passage in this small wavelength range needs. The hardest part is to achieve a high transmittance for only a very small wavelength range. If for example, would decrease the transmission curve, the signal would drop for the wavelength range and the gain for the S / N (signal to noise ratio) would no longer be achieved.

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