Manufacturer: Optolong
Product number: OPL-LRGBHA7-2

EUR 503,00RRP EUR 585,00you save 14% (EUR 82,00)


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The filter set for tricolor imaging
This filter kit includes all LRGB and the Ha 7 nm filter. It is suitable for planetary imaging as well as for photographing deep-sky objects.

LRGB filter set
This set divides the spectrum into its components red, green, blue and luminance.

OIII emission overlaps on blue and green filters with maximum transmission to allow high efficiency and natural color imaging. The gap between green and red filters serves to block out the primary sodium light pollution line at 589 nm and improves color balance and separation.

Main Use and Performance
Work well with debayered monochrome cameras
Suitable for deepsky and planetary imaging
RGB-imaging allows equal weighting factors for each channel, very important for automated imaging.
The ideal raw material for image processing in the sRGB color space is available with LRGB filter set and mono camera.


H-Alpha Filter 7 nm
The 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
Narrowband imaging with this filter can be done with the moon up in heavy light pollution, so your equipment is not sitting dormant for several weeks
H-alpha filter is the first narrowband addition to LRGB set for most imagers who blend a black-and-white Ha image into RGB data to enhance structural detail while maintaining natural look

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
IR cutoff at:700-1100 nm
Cell:Filter cell 2", black anodized, laser engraved
Clear Aperture:45 mm
Cell height:5 mm without external thread, 7 mm with M48 external thread
Typical transmission off-band:0.1% (OD3)
Typical transmission LRGB passband:95%
Centre wavelength H-alpha:656.3 nm
FWHM H-alpha:7 nm
Typical transmission H-alpha:>85%
5 Filters in suitable storage boxes

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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Reviews

Written by Volker Afflerbach
on 2022-09-14

"sehr gute qualität"