Manufacturer: Optolong
Product number: OPL-HA7-36

EUR 158,00RRP EUR 239,00you save 33.9% (EUR 81,00)


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Optolong H-Alpha Filter 7 nm, D=36 mm
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).

Best choice of narrowband H-alpha astrophotography filter for highest contrast and revealing subtle nebula details.

Main Use and Performance
Suitable for photographing on faint emission nebulae in full moonlight or in severe light pollution
Hubble look of images can be made by the combination of H-alpha, OIII and SII, such as the famous “Pillars of Creation” (M16 Eagle Nebula)
Narrowband imaging with SHO set (H-alpha, OIII and SII) can be done with the moon up in heavy light pollution, so your equipment is not sitting dormant for several weeks

Substrate:High-quality optical glass from Schott
Thickness:2.0 mm
Surface Treatment:Fine-optically polished
Surface Polish Quality:60/40 (Refer to MIL-O-13830)
Surface Quality:1/4 wavefront
Coating:Muti-coated
Cell:Unmounted glass plate with 36 mm diameter
Typical transmission off-band:0.1% (OD3)
Centre wavelength H-alpha:656.3 nm
FWHM H-alpha:7 nm
Typical transmission H-alpha:<85%
Filter
Protective case

Which side of the filter needs to face towards the telescope?
Optolong has a good explanation on their page with a check on unmounted filters. With mounted filters, it´s easy. The side with the external thread must face the camera.

Link to iOptron page: Should Optolong filters be installed in a certain orientation? (external link)
You can download the generated PDF from our own server.


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