Antlia Ha, SII and OIII 3nm Pro Highspeed Filter - 2'' Mounted

AntliaSKU: ANT-3NM-HIGHSPEED-2"-HA

Style: H-Alpha
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Sale price$575 CAD
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Description

Antlia Ha, SII and OIII 3nm Pro Highspeed Filter

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

The optical light path of a telescope is cone-shaped, which creates an angleand the center 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 by the simulation indicates that at a focal ratio of f/2.6, the angle of incidence of the light cone is 10°and its bandwidth shift 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 in order to compensate for the Blueshift and ensure high signal acquisition by telescopes with fast focal ratios.

Blueshift data simulation Figure:

Blueshift Data.jpg

Using these highspeed SHO 3nm Pro narrowband filters for the telescopes with focal ratio between f/2.6 and f/3.6 shows much stronger and more contrasted in astronomy imaging compared to the standard Pro version.

For optics 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 good choice.

 

Technical Specifications:


Hydrogen-alpha

Oxygen III

Sulfur-II

FWHM

3nm

3nm

3nm

CWL (Central Wavelength)

657.5nm

501.9nm

673.6nm

Peak Transmission

90%

90%

90%

Blocking

≥OD5 @ 300-1000nm

Filter Thickness

2mm+/-0.05mm

2mm+/-0.05mm for 1.25”, 2” mounted, Dia31mm and Dia36mm unmounted

3mm+/-0.05mm for Dia50mm and square 50x50mm unmounted

 

The main features and application:

High transmittance Ha/SII/OIII>90% and 3nm bandwidth to maximize contrast

- Antlia narrowband Pro Highspeed filters can be used with focal ratio f/2.6-f3.6 systems with minimal loss of signal

Improved sharp cut-off astrophotography 3nm Pro series filters are designed to minimize halos around bright stars

The out of band blocking specification is rated OD5 (0.001%) which delivers an excellent SNR(signal to noise ratio) and effective cut-off rate to minimize interference from other wavelengths

A single substrate to eliminate internal reflections

Narrowband Objects: Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants

Use in light polluted areas and dark sites

Extends imaging time when the moon is up

All Antlia unmounted narrowband Highspeed filters are edge blackened to eliminate internal reflections from stray light

Superior optical reliability reduces post image processing

Basic Substrate: Optical, Single / Non-glued substrate

Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)

Transmitted Wavefront: Lambda/4 or better.

Parallelism: less than 30 arcsec

Warranty: 3-years against delamination

 

Filter Ring:

Antlia standard ring:1.25’’ (M28.5*0.6),2’’(M48*0.75)

Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture

Black Anodized Finish

Laser Engraving No Fading

 

Not Recommended:

Solar imaging

Night visual observation

 

Not Permitted:

DO NOT LOOK AT THE SUN WITH THIS FILTER

Serious eye damage will result if you fail to observe the warning.

 

Spectrum Curves:

OIII 3nm Pro highspeed Spectrum.pngSII 3nm Pro highspeed Spectrum.pngHa 3nm Pro highspeed Spectrum.png

Additional Resources

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