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Les
filtres |
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| Filtres colorés Lumicon
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Rouge,
orange, jaune, vert, bleu, ultra-violet (clair), UV-30.
Utilisation pour les observations planétaires |
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Un filtre de
couleur est une lame de verre teintée qui empêche le passage
de la lumière complémentaire à sa propre couleur : un
filtre vert coupe le violet, un filtre bleu coupe le magenta… Ces
filtres permettent donc de faire ressortir certains détails tout
particulièrement en observations planétaires. Il faut donc
utiliser un filtre de la couleur complémentaire de ce que l’on
veut observer : Un filtre bleu foncera la tache rouge de Jupiter, un
filtre orange renforcera les régions verdâtres de Mars, faisant
ainsi ressortir les détails peu contrastés.
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Voici un cercle chromatique qui est bien utile pour cette
gymnastique de l'esprit. De plus nous n'avons peut être pas
tous en tête, les couleurs primaires et les couleurs
complémentaires correspondantes ! |
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Ainsi, le jaune est une
des trois couleurs primaires, et le violet qui se trouve à
l'opposé du cercle est sa couleur complémentaire, et ainsi
de suite |
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LUMICON
Color and Neutral Density Filters
The Lumicon
Color and Neutral Density Filters are made from renowned Schott and
Hoya optical glass and allow for maximum contrast on viewing
planetary and lunar detail. Individually precision ground, highly
polished with maximum light transmission coatings on both sides,
these filters are 100% guaranteed for life.
J'ai
personnellement ajouté les courbes de transmission des filtres
Wratten correspondants aux filtres Lumicon. Pour y accéder,
il vous suffit de suivre le lien réalisé sur les numéros de
chaque filtre. J'ai longtemps
cherché ce genre de renseignements aussi, ce sera j'espère pour
vous un gain de temps et surtout utile dans vos choix.
| Wratten
Number |
Lune |
Mercure |
Venus |
Mars |
Jupiter |
Saturne |
Uranus |
Neptune |
| #8
Light Yellow |
Feature Contrast |
x |
x |
Maria |
Belts/ Orange-Red Zonal |
x |
Dusky Detail |
Dusky Detail |
| #11
Yellow-Green |
x |
x |
x |
Maria |
Clouds/ Red-Blue
Contrast |
Clouds/ Cassini
Division/ Red-Blue Contrast |
x |
x |
#12
Yellow
|
Feature Contrast |
x |
x |
Blue-Green Areas |
Red-Orange Features |
Clouds/ Red-Orange
Features |
x |
x |
| #15
Dark Yellow |
Feature Contrast |
x |
x |
Clouds/ Polar Caps |
Belts |
Belts |
Dusky Detail |
Dusky |
| #21Detail
Orange |
x |
x |
x |
Maria |
Belts/ Polar Regions |
Belts/ Polar Regions |
x |
x |
|
#23A
Light Red |
x |
Planet/Sky Contrast |
x |
Maria/ Blue-Green |
Belts/ Polar Regions |
Belts/ Polar Regions |
x |
x |
| #25
Red |
x |
Features |
Planet-Sky Contrast/
Terminator |
Maria/ Polar Caps |
Belts/ Galilean moon
transit |
Clouds |
x |
x |
| #29
Dark Red |
x |
Features |
Planet-Sky Contrast/
Venus Terminator |
Maria/ Polar Caps |
Belts/ Galilean Moon
Transits |
Clouds |
x |
x |
| #38A
Dark Blue |
x |
x |
Clouds |
Dust Storms |
Belts/ Great Red Spot/
Disc |
Belts |
x |
x |
| #47
Violet |
x |
x |
Clouds |
Polar Caps |
x |
Rings |
x |
x |
| #56
Light Green |
Detail |
x |
x |
x |
Belts/Atmosphere
/ Red-Blue-Light Contrast |
x |
x |
x |
| #58
Green |
x |
x |
Clouds |
Polar Caps |
Red-Blue-Light Contrast |
Belts/ Polar
Regions |
x |
x |
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#80A
Blue |
Feature Contrast |
x |
x |
x |
Belts/ Rilles/ Festoons/
Great Red Spot |
Belts/ Polar Regions |
x |
x |
| #82A
Light Blue |
Low-Contrast Features |
x |
x |
Low-Contrast Features |
Low-Contrast
Features |
Low-Contrast Features |
x |
x |
| Wratten
Number |
Lune |
Mercure |
Venus |
Mars |
Jupiter |
Saturne |
Uranus |
Neptune |
|
ND13
Neutral Density
|
13%
Transmission
Moon: Glare Reduction
Double Stars: Bright Primary |
ND25
Neutral Density
|
25%
Transmission |
ND50
Neutral Density
|
50%
Transmission |
| Single
Polarizing Filter |
|
| Rotating
Polarizing Filter |
Moon:
Glare Reduction or Variable Transmission |
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| Object |
To
see
|
Recommended
Filter
|
| Mercury |
Planet/Sky
Contrast |
#23A
Light Red |
| |
Features |
#25
Red
#29 Deep Red |
| Venus |
Clouds |
#38A
Deep Blue
#47 Violet
#58 Green |
| |
Planet/Sky
Contrast |
#25
Red
#29 Deep Red |
| |
Terminator |
#25
Red
#29 Deep Red |
| Moon |
Detail |
#56
Light Green |
| |
Feature
Contrast |
#8
Light Yellow
#12 Yellow
#15 Deep Yellow
#80A Blue |
| |
Low
Contrast Features |
#82A
Light Blue |
| |
Glare
Reduction |
ND13
Neutral Density |
| Mars |
Clouds |
#15
Deep Yellow |
| |
Maria |
#8
Light Yellow
#15 Deep Yellow
#11 Yellow-Green
#21 Orange
#23A Light Red
#25 Red
#29 Deep Red |
| |
Blue-Green
Areas |
#12 Yellow
#23A Light Red
|
| |
Dust
Storms |
#38A Deep Blue
#56 Light Green
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| |
Polar
Caps |
#15
Deep Yellow
#25 Red
#29 Deep Red
#47 Violet
#56 Light Green
#58 Green
Deep Sky Filter |
| |
Low
Contrast Features |
#82A
Light Blue |
| Jupiter |
Clouds |
#11
Yellow-Green |
| |
Belts |
#8
Light Yellow
#15 Deep Yellow
#21 Orange
#23A Light Red
#25 Red
#29 Deep Red
#38A Deep Blue
#56 Light Green
#80A Blue |
| |
Rilles |
#80A
Blue |
| |
Festoons |
#80A
Blue |
| |
Atmosphere |
#56
Light Green |
| |
Red-Orange
Features |
#12
Yellow |
| |
Orange-Red
Zonal |
#8
Light Yellow |
| |
Red/Blue
Contrast |
#11
Yellow-Green |
| |
Blue/Light
Contrast |
#25
Red |
| |
Great
Red Spot |
#38A
Deep Blue
#80A Blue |
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Galilean
Moon Transits |
#25
Red
#29 Deep Red |
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Red/Blue/Light
Contrast |
#56
Light Green
#58 Green |
| |
Polar
Regions |
#21
Orange
#23A Light Red |
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Disc |
#38A
Deep Blue |
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Low
Contrast Features |
#82A
Light Blue |
| Saturn |
Clouds |
#11
Yellow-Green
#12 Yellow
#25 Red
#29 Deep Red |
| |
Belts |
#15
Deep Yellow
#21 Orange
#23A Light Red
#38A Deep Blue
#58 Green
#80A Blue |
| |
Polar
regions |
#21
Orange
#23A Light Red
#58 Green
#80A Blue |
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Rings |
#47
Violet |
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Cassini
Division |
#11
Yellow-Green |
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Red/Blue
Contrast |
#11
Yellow-Green |
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Red/Orange
Features |
#12
Yellow |
| |
Low
Contrast Features |
#82A
Light Blue |
| Uranus |
Dusky
detail |
#8
Light Yellow
#15 Deep Yellow |
| Neptune |
Dusky
detail |
#8
Light Yellow
#15 Deep Yellow |
| Double
Stars |
Bright
Primary |
ND13
Neutral Density |
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