New Altair 3nm ULTRA Narrowband filters are in stock.
 
Another Altair first - each filter has an individual test report.
 
Very deep OD blocking make these filters able to support deepsky imaging with a full moon, in the city. In fact, the images below were taken in London this summer.
 
I've added some star tests with Altair 80mm F6 Triplet APO running at F4.8 with Planostar 0.8x reducer. They were kindly sent to me by customer Ryan Harris, a Beta tester who has had them for some time, and a member of the Altair Facebook group. You can check out his images in the group.
 

 
 
 

 
Single sub screenshot with Altair Hypercam 26M camera & Altair 80mm Wave Series ED Triplet. 600secs DBE & basic stretch in Pixinsight (elephant's trunk nebula, test images all courtesy Ryan Harris, London): 
 

Here's a link Altair Wave Series 130mm ED Triplet APO review
 

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.