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Astronomy > Filters > Nebulae filters > H-Alpha Filters > Optolong > Optolong Filters H-alpha 7nm 2"
Product no.: 83198

Filters H-alpha 7nm 2"

$ 204.00 incl. VAT, plus shipping costs
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Product description

H-alpha filter passes light at 656nm wavelength. Best choice of narrowband H-alpha astrophotography filter for high-contrast imaging and revealing rich details of the nebula even in areas with strong light pollution,

H-Alpha 7 nm filter is the most popular narrowband filter allowing 7 nm bandwidth of light centered on a wavelength of 656 nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (skyglow).

Specifications

Capacity


Central wavelength (nm)
656,3
Half-value width (nm)
7
filter thickness (mm)
2
Frame
2"
Transmission
85
Mount material
Aluminium
Coating of optical system
multiple
Free transmission (mm)
45
Surface accuracy
1/4

General


Type
Filters
Type of build
line filter

Area of application


Useful for photographs
yes
Visually useful
yes
Twin stars
no
Moon & Planets
no
Nebulae & galaxies
yes
Optolong Filters H-alpha 7nm 2"
Light transmission curve

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