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Astrophotography contest
From June 1st to July 31st, get a chance to win a CA$50 gift card by submitting your image of Rho Ophiuchi!
Used, but in perfect condition. The ALP-T dual band 5nm SII&Hb filter is a dual line-pass filter, which lets the deep red Sulfur-II line and t...
View full detailsPreorder now. Description Specifications In the box Manuals & Downloads Askar is introducing the SQA55, a auintuplet air-spa...
View full detailsH-α (hydrogen-alpha) at 656 nm (nanometers) is deep red in color and the most popular narrowband filter. Hydrogen is ubiquitous in the cosmos and i...
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