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2" Narrowband O-III Oxygen 3 Nebula Deep Sky Filter Astronomy Photography For Sale


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2" Narrowband O-III Oxygen 3 Nebula Deep Sky Filter Astronomy Photography:
$29

2" Narrowband O-III Oxygen 3 Nebula Deep Sky Filter Astronomy Photography 2" Narrowband O-III Oxygen 3 Nebula Deep Sky Filter Astronomy Photography

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Description

Excellent 2" O-III Astronomical Nebula Filter, c/w storage Case.

This top quality 2" O-III astronomical nebula filter is in excellent, lightly used condition.  It comes complete with a foam-lined storage case as shown.

An Oxygen-III (OIII) filter is an interference "line" filter designed for use on certain types of emission nebulae. These filters allow the prominent emission lines of Oxygen to pass, while excluding many other wavelengths. The O-III lines exist in the blue-green part of the spectrum, and have wavelengths of 496 nanometers and 501 nanometers, with the 501 nanometer line being the stronger of the two. These two lines are what give some brighter planetary nebulae their bluish-green coloration when observed visually. OIII filters only diminish the nebula's brightness slightly, but they will significantly reduce the residual sky glow from light pollution, natural airglow, and other non-desirable light sources. This is achieved through a very high transmission at the OIII wavelengths coupled with a very narrow passband width, which is typically less than 20 nanometers FWHM (Full Width at Half Maxima). This can make some faint nebulae a lot easier to see than they would be without a filter in place.

The contrast enhancement is particularly striking on a few notable diffuse nebulae like the Veil Supernova remnant, as well as on a large number of planetary nebulae.
They tend to work the best under dark or semi-dark sky conditions, as the eye must be well dark-adapted to get the most out of the filter's performance. However, with some shielding from local light sources, they can be successfully used in urban viewing locations.

I'm happy to combine postage.

Please see my other astronomy related items listed!

Any questions, please feel free to ask!

Terms of Sale

All items are described as accurately and honestly as possible. Returns will be accepted and a full refund (including postage) will be givenshouldthe item be not as described. Such a decision will have to be agreed with the seller first in those circumstances. If the item is found to be 'as described' but was purchased in error, returns are accepted,and the purchase cost of the item will be refunded. In such situations,no postage refunds will be issued.

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