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Altair 4nm DualBand CERTIFIED CMOS filters - Ha / Oiii - with test certificate


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  • ALTAIR

Hi there, Altair 4nm Dual Band CERTIFIED CMOS filters are in stock, and shipping now.

 

Each filter comes with an individual spectrographic test report. Just like our telescopes with optical test reports.

OD blocking, bandwidth and transmission are ideal for "extreme" light pollution, full moon, and imaging in summertime.

Optimized for F4.8 or slower. For example, they're ideal for an F6.0 refractor with 0.8x reducer, or anything slower. 

 

image.png.48c84fb28a87f21d91427c5e1bcc0c22.png

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  • 2 months later...

How much detail does the certificate provide ?  If it covers the full range from 400 to 700 nm, that won't give much confience in the accuracy around the centre wavelength because 3 nm is just 1% of the range)  If the test report also showed a second graph zoomed in around the centre wavelength, say +/- 25 nm, that would provide a lot more confidence in the filter performance.  As an engineer, I'd be happy to buy this product rather than a competitors if its test report can demonstrate that its performance matches the design intent.

Dave Cundy, Bristol

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  • ALTAIR
On 9/26/2022 at 5:38 PM, BucketDave said:

How much detail does the certificate provide ?  If it covers the full range from 400 to 700 nm, that won't give much confience in the accuracy around the centre wavelength because 3 nm is just 1% of the range)  If the test report also showed a second graph zoomed in around the centre wavelength, say +/- 25 nm, that would provide a lot more confidence in the filter performance.  As an engineer, I'd be happy to buy this product rather than a competitors if its test report can demonstrate that its performance matches the design intent.

Dave Cundy, Bristol

 

Hi Dave, well we printed these out across the full range which is the convention, but if you like, when you order, you can request a report showing 25nm data for each peak for your filter at .5nm res. We'll charge £25 for the extra work. I'm sure you'll like this filter. The performance is excellent according to customer feedback so far. You can ask real world owners about this filter in the Altair Facebook group here too.

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  • 4 months later...
  • ALTAIR
On 2/22/2023 at 5:23 PM, Greg M said:

This filter is still not showing up on the U.S. distributors website. Is it available yet in the U.S.?

HI Greg, yes it's available - you just need to contact Land Sea and Sky Oderi Altair Astro products in the USA to order as it isn't on the website, or you can just order the Altair 4nm Dual Band filter here

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