The Nebula Filters

 

 

 

We offer the complete filter program by Astronomik, and additionally some Baader nebula filters.

 

 

We have collected some general information on nebula filters: General Information

 

Some images taken with and without filter may help you in your decision of choosing the right filter for your purpose. For that please click on the following link: filter comparison

 

And do not miss to look up our table for deep sky objects for nebula filters: Table (opens new window)

 

 

Visual filters:

 

The visual filters are made for emission and planetary nebula with dominant emission lines of OIII, H-beta and H-alpha. The pass bandwidth is varying, but all of them block the typical lines of urban illumination. Therefore contrast is enhanced especially in areas with high light pollution. The filters can be used photographically also, but you have to take care for the color information.

These filters are normally available on stock.

 

Art.-No.

Description

Bandwidth of pass

Purpose

Price (€)

AS-CLS-1.25”

CLS-filter (City Light Suppression),

1,25 inch

Between 450 and 540nm and from 650nm

The pass bandwidth is the region of the night adapted eye’s most sensitive wavelength region. This contains the OII and H-beta lines. Also the far red and near infrared (H-alpha) can pass the filter.

Typical light pollution sources are filtered out. The pass bandwidth is really broad, so this filter is recommended for all telescopes to enhance contrast for all deep-sky objects.

 

69,00

AS-CLS-2”

CLS-filter,

2 inch

Between 450 and 540nm and from 650nm

as AS-CLS-1.25“, but fit with 2-inch eyepieces.

159,00

BA-UHC-1.25“

UHC-filter,

1,25 inch

about 60nm between 450 and 510nm and from 630nm

The bandwidth of this filter is two thirds of the CLS-filter. However, OIII- and Hί-lines as well as the far red (H alpha) can pass it. Typical light pollution sources are filtered out effectively. The bandwidth is broad enough to recommend this filter for contrast enhancement for small telescopes also. Best used for planetary and galactic nebula. For galaxies or star clusters the effect is much less.

65,00

BA-UHC-2“

UHC-filter,

2 inch

about 60nm between 450 and 510nm and from 630nm

as BA-UHC-1.25“, but fit with 2-inch eyepieces.

112,00

AS-UHC-E-1.25“

UHC-filter,

1,25 inch

ca. 45nm bandwidth between 470-515nm

As Baader UHC, but somewhat smaller bandpass.The economy version of the Astronomik UHC-filter.

65,00

AS-UHC-E-2“

UHC-filter,

2 inch

ca. 45nm bandwidth between 470-515nm

wie AS-UHC-E-1.25“, aber passend fόr 2-Zoll-Okulare

125,00

AS-UHC-1.25“

UHC-filter,

1,25 inch

35nm bandwidth between 475 and 510nm, and about 25nm bandwidth around 655nm

The bandwidth of this filter is just one third of the CLS-filter. However, OIII- and Hί-lines as well as the far red (H alpha) can pass it. Typical light pollution sources are filtered out effectively. The bandwidth is broad enough to recommend this filter for contrast enhancement for small telescopes also. Best used for planetary and galactic nebula.

99,00

AS-UHC-2“

UHC-filter,

2 inch

35nm bandwidth between 475 and 510nm, and about 25nm bandwidth around 655nm

as AS-UHC-1.25“, but fit with 2-inch eyepieces.

229,00

AS-OIII-1.25“

OIII-filter,

1,25 inch

about 25nm bandwidth around 498nm

Filter with a small pass bandwidth around 500nm (both OIII-lines). useful to achieve highest contrast within OIII emission nebula (plantary nebula, supernova remains). The filter is really dark as no other wavelength can pass.

99,00

AS-OIII-2“

OIII-Filter,

2 inch

about 25nm bandwidth around 498nm

as AS-OIII-1.25“, but fit with 2-inch eyepieces.

229,00

BA-OIII-1.25“-CCD

 

New!

OIII-filter,

1,25 inch

About 10nm bandwidth around 498nm, no transmission up to 1150nm

A filter for visual and photographic use. Blocking up to 1150nm is important for CCD-photography , as no additional IR-blockfilter is necessary. First choice for visual use at low magnifications also, as the bandwidth is quite small.

95,00

BA-OIII-2“-CCD

 

New!

 

OIII-Filter,

2 inch

Etwa 10nm Bandbreite um 498nm, sperrt bis 1150nm

wie BA-OIII-1.25“-CCD, aber passend fόr 2-Zoll-Okulare

145,00

BA-OIII-1.25“

OIII-Filter,

1,25 inch

about 6 to 8nm bandwidth around 498nm

as Astronomik OIII, but remarkably smaller bandwidth

69,00

BA-OIII-2“

OIII-Filter,

2 inch

about 6 to 8nm bandwidth around 498nm

as BA-OIII-1.25“, but fit with 2-inch eyepieces

128,00

AS-HB-1.25“

H-beta filter,

1,25 inch

about 15nm bandwidth around 485nm

Filter with small pass region around 485nm (H-beta-Linie). Best contrast for hydrogen nebula. The filter is really dark as no other wavelength can pass.

99,00

AS-HB-2“

H-beta Filter,

2 inch

about 15nm bandwidth around 485nm

as AS-HB-1.25“, but fit with 2-inch eyepieces

229,00

 

Photographic filters:

H-alpha filter are usually on stock, for all other filters please request delivery time.

Attention: Do not use the H-alpha filters for sun observations! Do not mix up these specialty filters with the photographic Astronomik filters!

 

Art.-No.

Description

Bandwidth of pass

Purpose

Price (€)

AS-HA-1.25”

H-alpha-filter,

1,25 inch

About 13nm bandwidth around 655nm

Photographic detection of hydrogen nebula with very high light pollution suppression

119,00

AS-HA-2”

H-alpha-filter,

2 inch

About 13nm bandwidth around 655nm

as AS-HA-1.25“, but fit with 2-inch eyepieces

279,00

AS-HA-6-1.25”

H-alpha-filter,

1,25 inch

About 6nm bandwidth around 655nm

Photographic detection of very faint hydrogen nebula with maximum possible light pollution suppression

189,00

AS-HA-6-2”

H-alpha-filter,

2 inch

About 6nm bandwidth around 655nm

as AS-HA-6-1.25“, but fit with 2-inch eyepieces

429,00

AS-RE-1.25“

Profi Red Type 2

1,25 inch

“red” spectral region

To build up colored photos from three grey images taken in red, green and blue spectral range.

59,00

AS-RE-2”

Profi Red Type 2

2 inch

“red” spectral region

as AS-RE-1.25“, but fit with 2-inch eyepieces

125,00

AS-GR-1.25“

Profi Green Type 2

1,25 inch

“green” spectral region

To build up colored photos from three grey images taken in red, green and blue spectral range.

59,00

AS-GR-2”

Profi Green Type 2

2 inch

“green” spectral region

as AS-GR-1.25“, but fit with 2-inch eyepieces

125,00

AS-BL-1.25“

Profi Blue Type 2

1,25 inch

“blue” spectral region

To build up colored photos from three grey images taken in red, green and blue spectral range.

59,00

AS-BL-2”

Profi Blue Type 2

2 inch

“blue” spectral region

as AS-BL-1.25“, but fit with 2-inch eyepieces

125,00

AS-L-1.25“

UV-IR-Blockfilter

complete visible spectrum

Used as UV and IR blocking filter to take the luminescence channel in RGB images

49,00

AS-L-2”

UV-IR-Blockfilter

complete visible spectrum

as AS-L-1.25“, but fit with 2-inch eyepieces

99,00

AS-L-RGB-1.25“

Set AS-RE, AS-GR, AS-BL, AS-L in 1,25”

 

 

219,00

AS-L-RGB-2”

Set AS-RE, AS-GR, AS-BL, AS-L in 2”

 

 

399,00

AS-IR-1.25“

Infrarot-Blockfilter, 1,25”

blocks infrared

Used in CCD-photography to block the infrared region of the spectrum, mostly to enhance sharpness

39,00

AS-IR-2”

Infrarot-Blockfilter, 2”

blocks infrared

as AS-IR-1.25“, but fit with 2-inch eyepieces

89,00

AS-OIII-CCD-1.25“

OIII filter for CCD, 1,25 inch

about 13nm bandwidth around 498nm

In photographic applications to get a colored image from OIII - SII - H-alpha exposures (can be used instead of RGB).

119,00

AS-OIII-CCD-2“

OIII filter for CCD

2 inch

about 13nm bandwidth around 498nm

as AS-OIII-CCD-1.25“, but fit with 2-inch eyepieces

279,00

AS-SII-1.25”

SII filter for CCD

1,25 inch

about 13nm bandwidth around 672nm

In photographic applications to get a colored image from OIII - SII - H-alpha exposures (can be used instead of RGB).

119,00

AS-SII-2”

SII filter for CCD

2 inch

about 13nm bandwidth around 672nm

as AS-SII-1.25“, but fit with 2-inch eyepieces

279,00

AS-MC-1.25“

Clear glass Multicoated, 1,25”

 

To keep the focus when using no filter.

35,00

AS-MC-2“

Clear glass Multicoated, 2”

 

To keep the focus when using no filter.

69,00