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Chroma H-Alpha 3nm Filter

Chroma H-Alpha 3nm Filter

(2 customer reviews)

£539.00£1,449.00

The Chroma H-Alpha 3nm Filter is essential for ultra high contrast images of nebulae under high levels of light pollution and Moon light. Normally used in comjunction with Chroma 3nm OIII  and 3nm SII narrowband filters to create composite images.

Description

The Chroma H-Alpha 3nm Filter is essential for ultra high contrast images of nebulae under high levels of light pollution and Moon light. Normally used in comjunction with Chroma 3nm OIII  and 3nm SII narrowband filters to create composite images.

At 656.3nm, a narrow-band emission filter is required to separate H-Alpha from the SII doublet (671.6nm and 673.1nm).

Wavelength (CWL): 656

Bandwidth (FWHM): 3

Chroma 3nm Ha image of NGC 2264 by Adam Jeffers using a QHY268M, APM LZOS 105/650 telescope and Riccardi 0.75x reducer.
3.5 hours of data with an 83% moon!

Chroma Ha 3nm - NGC 2264

Chroma Ha 3nm – NGC 2264

2 reviews

  1. Jonathan Bennink

    Fantastic filters, the absolute best out there. I got hooked on narrowband with my ZWO filters that came with my ASI1600MM, but these are in a league of their own. I upgraded to the 3nm Chroma set because I want to image during any moon and under Bortle 5 class skies and the results are breathtaking. With the Ha and Sii you can image during a full moon and with Oiii it’s best to wait for 60 % or less, depending on where your target is. NO internal reflections and nicely packaged with a good report and an extremely high transmission. If you spend 1500 pound on a scope + 1500 on a mount + 1500 on a camera, why use cheap filters?

  2. adamjeffers (verified owner)

    Well packaged by Bern at Modern Astronomy and delivered safely by RM SD. Chroma packaging itself nicely put together itself with a large outer cardboard box and a small plastic filter case, with the filter in a soft labelled sleeve. The filter was packaged with a certificate showing the individual test, and each filter has an inscription along the rim.

    I bought the 36mm unmounted version and fitted this to an empty 2″ filter holder using a 3d printed adapter. Using a 36mm filter was cheaper than the 2″ version – and the ideal size to be used with the new Sony IMX571 APS-C sized sensor (minimal vignetting at F4.65 in my case). I decided on the 3nm because I wanted the tightest passband possible to use on moonlit nights – the majority of the clear nights here seem to fall around the full moon.

    I use this filter on a 105mm refractor with a 0.75x Riccardi reducer. The Chroma Ha filter produces absolutely no evidence of a halo or weird reflections, even on the brightest of stars. I have tried with other brands of Ha filters, and they all produce haloes of varying sizes and brightnesses, along with reflections. The stars are also pinpoint in size, making it incredibly easy to remove them in star-removal software, and produce mesmerising star-free regions of dust and gas.

    I imaged NGC2264 with this filter less than 90 degrees from an 83% moon and I was unable to detect a gradient in the sub frames – it is literally that good at isolating Ha emissions in the presence of moonlight.

    I have since bought the Chroma 3nm Oiii and 3nm Sii filters These filters are a significant investment but what they do is produce high quality raw data that is so much easier to process with high contrast features.

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