Filters


 Thousand Oaks Optical Nebular filters

Enhance your viewing with the latest in multi-layer coating technology.  These filters greatly enhance contrast when viewing deep sky objects.  These filters reject manmade and natural light pollution from mercury vapor lights, high pressure sodium lights and natural airglow.  Available for 1.25" and 2" eyepieces and mounted in color coded cells.   Optical BK-7 glass with anti-reflection coating.  Manufactured in the U.S.

LP-1  Broadband LP-1  Broadband

Transmission Graph

LP-2  Narrowband LP-2  Narrowband

Transmission Graph

 

LP-1  Oxygen III LP-3  Oxygen III  LP-3  Hydrogen Beta LP-4  Hydrogen Beta 

 

 

LP-1  Broadband      (Black Cell)    1.25" $89.00    2" $179.00

LP-2  Narrowband      (Blue cell)    1.25" $89.00     2" $179.00

LP-3  Oxygen III     (Green cell)     1.25"  $89.00     2" $179.00

LP-4  Hydrogen Beta  (Red cell)    1.25"  $89.00     2" $179.00

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Nebular Filter Guidelines

Filters are listed on the following table with the most beneficial listed first.

LP-1 Broadband - Deep Sky or "Light Pollution"

LP-2 Narrowband - UHC (ultra high contrast)

LP-3 Oxygen 3 - OIII

LP-4 H-Beta - Hb

Object

Examples

Visual (light polluted)

Visual (dark site)

Stars and Clusters

M-13, M-11

LP-1 Broadband

none, LP-1 Broadband

Diffuse Nebula

M-8 (Lagoon), M-16 (Swan)

LP-1 Broadband, LP-2 UHC, LP-3 O3

LP-1 Broadband, LP-2 UHC

Planetary Nebula

M-57 (Ring), M-27 (Dumbbell)

LP-1 Broadband, LP-2 UHC, LP-3 O3

none, LP-2 UHC,  LP-3 O3

Faint Planetary

NGC-7293, Abell 33

LP-3 O3, LP-2 UHC

LP-2 UHC, LP-3 O3

Reflection Nebula

M-45 Pleiades, M-20 Trifid

none, LP-1 Broadband, LP-2 UHC

none, LP-1 Broadband, LP-2 UHC

Faint Nebula

Veil, Rosette

LP-3 O3, LP-2 UHC

 LP-2 UHC, LP-3 O3

Galaxies

M-101, M-33

none, LP-1 Broadband

none

H-Beta Emission

California, Horse Head

H-Beta

H-Beta

 


Tele Vue Filters

2" Nebustar (UHC) 2" OIII 1.25" Mars "A"
1.25" Nebustar (UHC) 1.25" OIII 1.25" Mars "B"

Features of Tele Vue Bandmate filters:

Optical grade BK7 glass to insure no image degradation due to the substrate.

Ion beam deposition of the coatings produces hard, stable coatings to reduce changes due to temperature and humidity.

Dielectric filter for high transmission and blocking of unwanted wavelengths provide high contrast images.

Aluminum filter cells precision machined and laser etched.

 

Bandmate Nebustar Filter

High-performance, dielectric, squarewave "UHC" type general purpose narrow-band filter great for all nebulae types and instrument sizes.  Red blocking allows brighter, sharper star images not plagued with red fringing seen on most filters of this type.  Highest transmission in critical bands

Bandmate OIII Filter

This OIII filter particularly enhances planetary nebulae in larger telescopes.  Narrowband filter for high transmission, with high blocking of unwanted longer wavelengths to yield high-contrast images.  Ion beam technology and optical glass produces low scatter in a hard stable coating to reduce changes due to temperature and humidity.

Bandmate Mars Filters

Tele Vue offers two contrast enhancing filters specifically designed for viewing Mars, but also quite useful on Jupiter.  Why two filters? Traditionally, standard colored filters have been used to bring out detail on the planet's surface.  The main drawback is the artificial color imposed on all planetary features.

Type A  The Type-A is a dual band filter with different dielectric coatings on each side of the substrate.  The dual band nature of the filter permits green and red through while rejecting all other visible colors.  The effect is to enhance detail on the Martian surface while preserving the natural color of the polar caps and rest of the surface.  Since this filter provides a most natural view, it is highly recommended for public viewing.

Type B  The Bandmate™ Mars Type-B filter is a high efficiency, single band dielectric coating that achieves penetrating views of the Martian surface.  The surface appearance is similar to that of the popular #21 filter.  However, the Type-B features a broadband anti-reflection coating on one side and filter coating on the other that makes it far more efficient.

 

Nebustar or OIII  2"        $185.00        Shipweight 1/2 lb.

Nebustar or OIII  1.25"     $95.00        Shipweight 1/2 lb.

Mars "A" 1.25"               $115.00        Shipweight 1/2 lb.

Mars "B" 1.25"               $115.00        Shipweight 1/2 lb.

 

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