Baader Ultra-Highspeed f/2 Filter Set 3.5/4nm 2" (H-alpha/O-III/S-II)
When will I receive it?
Products marked In stock are dispatched promptly — the exact delivery estimate for your address is shown at checkout, before you confirm the order.
For international shipments, delivery times depend on the destination and are always displayed at checkout before payment.
Products marked Available on order require 5–15 business days for processing. Our team will keep you updated promptly if anything changes.
What are the warranty terms?
Shop with confidence: all our products include a 24-month legal warranty for conformity defects, managed directly by our team.
Many brands also offer extended warranty coverage beyond 24 months — contact us to find out the specific terms for the product you're interested in.
Click here for more information.
Can I return a product?
Yes: you have 14 days from delivery to return any product and receive a full refund — see our Refund Policy for full details.
Items must be returned in their original condition and packaging. Return shipping costs are the customer's responsibility.
Not sure which product is right for you? Contact us before buying — we'll help you find the perfect instrument so you won't need to return anything.
Sei un'azienda? Compila il modulo per la fatturazione
Clicca sul pulsante qui sotto per inserire i tuoi dati aziendali:
Vai al moduloThe Baader Ultra-Highspeed f/2 Filter Set 3.5/4nm 2" (H-alpha / O-III / S-II) combines the center wavelength pre-shift of the Highspeed range with the ultra-narrow bandwidth of the Ultra-Narrowband range, for the absolute maximum contrast on ultra-fast astrographs such as the Celestron RASA and Hyperstar.
The best of both technologies
The set includes an H-alpha filter, an O-III filter and an S-II filter with an ultra-narrow bandwidth of 3.5/4nm FWHM and CWL pre-shift, specifically calibrated for optical systems from f/3.4 to f/1.8. The narrower bandwidth allows the maximum possible contrast even under strongly light-polluted skies (Bortle 9/8/7/6), further reducing apparent star size and revealing the finest nebula details — even at the most extreme apertures.
Baader CMOS-Optimized technology
Each filter is coated with Reflex-Blocker™ treatment, which eliminates unwanted reflections even in the presence of auxiliary optics, and with Life-Coat™ technology: a hardened coating that does not peel, degrade, and lasts the entire life of the filter even in the most extreme conditions. The edges are blackened all around, with a visual indicator on the front side for correct orientation during mounting.
Technical specifications
| Parameter | Value |
|---|---|
| Filters included | H-alpha, O-III, S-II |
| Bandwidth (FWHM) | 3.5 / 4 nm |
| Format | 2" (50.8mm), M48 thread |
| Recommended optical systems | f/3.4 to f/1.8 (ultra-fast astrographs) |
| Filter thickness | 2 mm |
| Coating | Reflex-Blocker™, Life-Coat™ |
| Brand | Baader Planetarium |
Who it's for
The ultimate set for astrophotographers using ultra-fast astrographs like the Celestron RASA or Hyperstar systems who want the absolute maximum contrast available, even under strongly light-polluted skies, for high-contrast imaging of emission nebulae in the "Hubble Palette" style (SHO).