Antlia 3nm High Speed Ha,OIII and SII Filters
  Zoom
 Antlia 3nm High Speed Ha,OIII and SII FiltersAntlia 3nm High Speed Ha,OIII and SII Filters 

Antlia 3nm High Speed Ha,OIII and SII Filters

£420.00✓ 2 year warranty
Choose:  




:  

1x in stock shipped 1-2 working days
Share

About this product

Model:  antlia_3nm_hs_ha2

Antlia 3nm High-Speed Ha, OIII and SII Filters

Antlia's SHO 3nm Pro Highspeed Filters are further optimised for high-speed imaging systems by pre-shifting the centre wavelength. This specially optimised version will provide significantly higher SNR (Signal to Noise Ratio) for fast telescopes with focal ratios between f/2.6 and f/3.6 compared to the standard 3nm Pro version.

Initially, these filters will be available only in 36mm and 2" sizes. 50mm Round and Square options will also be available later.

The optical light path of a telescope is cone-shaped, which creates an angle, and the centre wavelength of the interference filter will shift toward shorter (blue) wavelengths as the angle of incidence((AOI) increases; the greater the angle, the greater the shift. The amount of beam deviation depends on the refractive index and the thickness of the substrate. The blue shift data shown by simulation indicates that at a focal ratio of f/2.6, the light cone's incidence angle is 10°and its bandwidth shifts 2.2nm to shorter wavelengths. Therefore, the Highspeed 3nm Pro narrowband filters are designed to be pre-shifted by 1.2nm towards the longer (red) end to compensate for the Blueshift and ensure high signal acquisition by telescopes with fast focal ratios.

These highspeed SHO 3nm Pro narrowband filters for telescopes with a focal ratio between f/2.6 and f/3.6 show stronger data with higher contrast than the standard Pro versions.

For optical f-ratios slower than f/3.6, the standard 3nm Pro filters are highly recommended. Meanwhile, if you use optics faster than f/2.6, the 4.5nm EDGE filters are the best choice.

Specifications

  Ha OIII SII
Central Wavelength 657.5nm 501.9nm 673.6nm
Peak Transmission 90% 90% 90%
Filter Thickness 2mm 2mm 2mm
Filter Thickness 50mm Round/Square 3mm 3mm 3mm

 

Customer reviews

Be the first to Write a Review for this item!

FAQ

Please fill in the form below to ask a question.

*
*
*
*
Please add the two numbers