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Optolong H-Alpha Filter 7 nm, 50 mm unmounted

Name: Optolong H-Alpha Filter 7 nm, 50 mm unmounted
Brand: Optolong
SKU: OPL-HA7-50
Price: 187 EUR

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

narrowband line filter for important nebulae emission line

well suited for cameras with full-frame transfer sensors

2 mm thick and thus homofocal with many other filters from Optolong

interference filter

unmounted glass plate with 50 mm diameter

fine-optically polished

multi-layer hard coated - largely scratch-proof

Manufacturer: Optolong

Product number: OPL-HA7-50

EUR 187,00RRP EUR 259,00you save 27.8% (EUR 72,00)

incl. 19 % VAT (DE)

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excl. 6.95 € shipping costs (DE)

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Optolong H-Alpha Filter 7 nm, 50 mm unmounted

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

narrowband line filter for important nebulae emission line

well suited for cameras with full-frame transfer sensors

2 mm thick and thus homofocal with many other filters from Optolong

interference filter

unmounted glass plate with 50 mm diameter

fine-optically polished

multi-layer hard coated - largely scratch-proof

Details..
Technical data..
In the box..
Reviews..

Optolong H-Alpha Filter 7 nm, D=50 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 50 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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