Narrowband Filter Sets

$443.4 ~~$739~~ In stock

IDAS Narrowband Filter Sets include H-alpha, OIII, and SII filters for narrowband imaging. The set is available in multiple sizes, thicknesses, and classifications so you can match a configuration to your setup.

Includes H-alpha 6.8nm, OIII 6.0nm, and SII 6.3nm filters.
Available classifications: Standard (STD) or Ultra High-Speed (UHS).
Thickness options include 2.5mm and 3mm.
Size options include 36mm unmounted, 48mm mounted, 50.8mm CFW, and 52mm mounted.
Brand: IDAS.

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Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

Ellie J. ★★★★★ Oct 21, 2026

The OIII and SII filters pair perfectly with my H-alpha, and the multiple size options meant I didn't have to swap adapters. Stars stay tight corner-to-corner across the whole frame, which is exactly what I needed for my narrowband setup.

Kevin N. ★★★★★ Oct 20, 2026

I was worried about parfocal performance across the set, but these three filters hold focus perfectly without needing to tweak my setup. The 3nm bandpass on the H-alpha really cuts through my light-polluted backyard sky.

Christopher G. ★★★★★ Oct 19, 2026

The three filters are nicely matched for color balance in my dual narrowband setup, and the H-alpha really cuts through light pollution. Only wish the set came with a storage case.