Orion USA Eyepieces and Accessories

Good quality accessories are equally important as the quality of the telescope itself. Orion USA offers a broad range of eyepieces, filters and other accessories for your telescope.

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Nebular Filters Broadband and narrowband filters for various telescope and eyepiece mounts	Variable Polarizer Neutral (grey) filter infinitely adjustable - 1.25" & 2"	2x Barlow 1.25" - 3 Lens Design High quality apochromatic Barlow lens Shorty Plus

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Nebular Filters - 1.25" / 2" / SC

Nebular filters block artificial stray light, permitting the light of gas nebulae and planetary nebulae nearly unhindered. As a result contrast is enhanced strongly.

Broadband Nebular Filter

Visual Application
Broadband nebular filters have a higher light transmission than narrowband filters. As a result the image is brighter and allows you to use these filters on smaller telescopes (70mm aperture and larger). The overall impression of the image remains unchanged, only the number of visible stars is reduced slightly.

The filter is used not only for planetary nebulae and gas nebulae (such as a narrowband filter), but also for galaxies. Of course the brightness of the galaxy is reduced a bit, but the contrast is enhanced by cutting off artificial stray light and thus reducing the background brightness.

Photographical Application
This is one application the broadband filters excel in. Exposure times are extended by about 100%, but the contrast is enhanced noticeably. Even near light-polluted urban areas you will get good-quality colour images of deep sky objects.

Item No.	Short description	Price - Euros incl. VAT
OR BNF 1,25"	Broadband filter - with 1.25" filter thread for standard 1.25" eyepieces and accessories	89.-
OR BNF 2"	Broadband filter - with 2" filter thread for standard 2" eyepieces and accessories	105.-
OR BNF SC	Broadband filter - SC thread on both sides - for Celestron and Meade Schmidt Cassegrains, many Maksutov-Cassegrains, ...	105.-

Narrowband Nebular Filter

Visual Application
Narrowband nebular filters are made for astronomical observations in light-polluted areas. The important spectral lines H-Alpha, H-Beta and O-III are permitted through the filter nearly unhindered, while background brightness is reduced by cutting off stray light.

Deep Sky objects gain a lot of contrast from narrowband filters. Gas nebulae and planetary nebulae in particular often appear better in a small telescope with narrowband filter than in a larger telescope without filter.

We do not recommend using the filter for galaxies because they become too faint in the filter.

Photographical Application
With a narrowband filter capturing gas nebulae and planetary nebular from light-polluted urban areas becomes possible. Exposure times become 4-5 times longer, but contrast is raised enormously.

Item No.	Short description	Price - Euros incl. VAT
OR NNF 1,25"	Narrowband filter - with 1.25" filter thread for standard 1.25" eyepieces and accessories	99.-
OR NNF 2"	Narrowband filter - with 2" filter thread for standard 2" eyepieces and accessories	124.-
OR NNF SC	Narrowband filter - SC thread on both sides - for Celestron and Meade Schmidt Cassegrains, many Maksutov-Cassegrains, ...	124.-

There is often a large difference in brightness in details of many objects within our solar system. This is particularly obvious in:

- craters on the moon near the terminator (the dividing line between the bright and the dark side of the moon)
- sun spots and flares on the sun
- details of the planets

Bright areas outshine dark regions so that you will not be able to see all delicate details. With a variable polarizer you can adjust the image brightness according to your observing needs at any moment.

Light Transmission
Transmission of the variable polarizers is freely adjustable between 1% and 40%. As a result you can use the filter on nearly any telescope.

Practical Use
The variable polarizers are made of two separate polarizing filters in a rotating cell. By rotating the lower filter in relation to the upper filter you can reach different factors of light transmission.

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The Orion Shorty Plus Barlow lens offers top grade image quality with all telescopes - Newtonians, Apochromats, Mak-Newtonians, ...
Its short body allows you to use it in 1.25" star diagonals or short Newtonian focusers.

The Barlow lens itself consists of three air-spaced multi-coated lenses for maximum transmission and image sharpness.

With 27mm clear diameter you can use all 1.25" eyepieces without vignetting.

The Shorty Plus is also highly recommended for astro-imaging. With the optional T2 adaptor you can attach standard SLR cameras (you only need a T-ring for the camera), turning the Shorty Plus Barlow into a powerful tele-converter with a focal extension factor of approx. 2.5x

Prices and availability: Please see our new Online Shop