Sirius Optics (USA)

Is an optical coating company using thin film vapour deposition technology. They are producing an ever expanding line of Astronomy filters.
Currently available filters:-
Contrast Enhancement (CE1), Nebula, Minus Violet, Minus Violet (variation), Near Infrared blocking, Planetary Contrast & Variable Filter Wheel, OIII, Hydrogen, Hydrogen - Beta and a Red/Green/Blue filter wheel.

Orion:
We carry a range of Orion Filters sets and light pollutions filters in both 1.25' and 2" format.

# 15 Deep Yellow

• Contrast of lunar surface
• Polar caps & orange desert regions on Mars
• Orange and red features on Saturn and Jupiter

#25 Red

• Martian surface detail in larger scopes
• Contrast of Mercury against blue sky
• contrast and cloud definition of Venus
• Bluish clouds of Saturn and Jupiter

#58 Green

• Lunar surface detail
• Contrast of red spot on Jupiter
• Contrast of subtle red and blue hues
• Melt lines around polar caps on Mars

#80A Medium Blue

• Contrast of comet tails
• lunar surface detail (significantly)
• Martian polar caps and high clouds

# 11 Yellow-Green

• Contrast of Martain maria and polar caps
• Orange and red features on Saturn and Jupiter

# 21 Orange

• Contrast of Mercury and Venus in daylight
• Bands and festoons on Jupiter and Saturn

# 47 Violet

• Contrast of Venus, reducing glare and twinkling
• Surface detail on Mercury and Venus
• Ring structure of Saturn

# 82A Pale Blue

• Orange and purple cloud belts of Saturn and Jupiter
• Comet tails
• Suppresses chromatic aberation in refractors

# 23A Light Red

• Maria on Mars
• Comet Dust tail and coma
• Orang and red belts on Jupiter and Saturn

# 38A Deep Blue

• Dust storms on Mars
• Subtle details in Saturn cloud belts
• Bright comet gas tails

# 56 Light Green

• Martain polar caps and low clouds
• Low-contrast blue and red hues of Jupiter
• Surface contrast of Saturn

# 8 Light Yellow

• Maria on Mars
• Comet dust ail and coma
• orange and red belts on Jupiter and Saturn