Altair Astro

Altair 130mm Aperture Energy Rejection filter - Ha Hydrogen Alpha only D-ERF for 5" Refractors

Product Features:

• Reduces approx. 98% of heat reaching the optics to keep Etalon from drifting off-band and protect your equipment.
• 30-40nm FHWM Bandpass at H-alpha (H) wavelength of 656.28 nm (Full Width Half Minimum) Transmission: ~90%
• UVIR blocking OD3 0.1% @400-1100nm blocking over 98% of heat to your 3rd party Etalon at eyepiece or camera end, E.g. Daystar Quark). Please note it's your responsibility to use a proper commercial Etalon with this product, and to follow the manufacturer's instructions.
• Visible light blocking: OD4 0.01% @400-700nm to reduce reflection effects and over 98% of heat.
• Diameter 140mm Thickness 12.0mm 
• Multilayer coatings with SiO2 protective overcoat.
• ERF Holder cell included with soft tip threaded knobs. Tough and very light, easy to disassemble for cleaning the filter with optical wipes. Cell does not put any tension on the optics and will not scratch or damage your telescope. It also won't alter the balance as much as an aluminium cell.

Narrowband H-Alpha, O-III and SII nebula filters from Altair for astrophotography with CMOS sensors for high contrast for telescopes with ~f/4.5

• optimized for CMOS sensors (Color and MONO)
• exact and narrow half-widths for optimal signal-to-noise ratio
• Identical filter thicknesses for homofocality
• Blackened edges
• The edge of the filter is sealed to prevent moisture penetration
• SiO2 coating for virtually unlimited lifetime
• Low-profile filter mount - height only 6 mm
• Certificate

Altair DualBand 4nm Filter Features:

• Capture the two main emission nebulae bands at the same time, whilst suppressing light pollution, moonlight, and airglow.
• More data in less time, opening up your imaging window, even into the summer months when it isn't quite dark yet. Capture twice the Oiii data, whilst obtaining Sii to complement the Altair Ha Oiii DualBand filter.
• Extremely steep bandpass yields maximum contrast in extreme light pollution: 4nm FHWM centred precisely on the target wavelengths.
• Can be used with One Shot Colour (OSC) CMOS or mono astronomical cameras for luminance data.
• Includes UVIR blocking for both modified and un-modified DSLR cameras, plus an anti-reflection coating for halo suppression. To see the AR coating in action, please see images demonstrating the same filter with and without the AR coating on the bright star, Capella in exactly the same conditions with the same settings.
• Best performance at focal ratios as fast as F4.8, with contrast increasing as focal ratio increases. More info about light pollution filter performance and focal ratio here.
• The 2" filter has standard M48x0.75mm thread, and fits inside the Altair Magnetic Filter holders, standard 2" filter wheels, plus the Altair Canon / Nikon DSLR lens to astro CMOS adaptors. 

• 9-megapixel Sony IMX533 back-illuminated sensor with 16mm diagonal
• 14bit ADC delivers 16,384 grey levels in the image
• Zero Amp Glow even at 10 minutes exposure
• Special Ultra Low Read Noise mode
• True hardware binning
• 2 stage TEC cooling
• Heated optical window
• 2 year warranty, with no sensor freeze guarantee**.
• USB3.0/USB2.0 connection with rear USB2.0 hub (2x ports)
• 12V power is required to operate this camera.
• Armoured case included
• Supplied basic 240~110v compatible 12v DC power supply with choice of UK, USA or EU plug
• Software & drivers downloadable from www.altairastro.help