Altair Astro

The Altair 395nm NUV filter selectively passes light of the two main Calcium wavelengths emitted by the sun: CA-K line at 393.37nm, and the CA-H line at 396.85nm.

• Multi-Layer Anti-Reflection coating to reduce star-halos and reflections from camera optical window.
• Batch-tested for consistency.
• Ultra-flat glass by Schott Germany. 1.85mm Glass 30sec parallel, optical polish to MIL Spec. MIL-O-13830.
• High quality dichroic/dielectric coatings. Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength). No deviation affected by temperature change.
• UV/IR block for imaging - star bloat reduction with refractors.
• Precision CNC machined filter cell for strain-free mounting and freedom from tilt.

• Point and see. No alignment required.
• Next to zero setup time.
• Smooth and easy to use.
• No power required.
• Compatible with most common tripods.
• High capacity with excellent machining and fitting.
• Stable astronomy or terrestrial observing with large or small scopes.
• Compatible with Altair TMS dovetail clamps (very high end), or others with standard M8 / 35mm hole pattern.
• Mount head weight of 3.2kg, dimensions are on the product images.

Altair Astro CNC pier adapter for many mounts, suitable for SkyShed pier and of course adaptable for other piers

• Suitable for iOptron CEM70, CEM60 and iEQ45
• Suitable for Skywatcher EQ6, AZ-EQ6, HEQ5, EQ5, EQ3
• Suitable for Celestron CGEM, CGEM-DX
• Suitable for LXD75 and many Vixen mounts
• Four countersunk holes for M8 screws - distance from the centre 64.5 mm
• Comes with four M8 stainless steel screws for attaching the adapter to the column
• Flat base for easy adaptation to columns and column stands
• Diameter 148 mm
• Height 30 mm

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 on 500.7nm Oiii wavelength, and 4nm FHWM centred on the 671.6nm Sii wavelength.
• Halo suppression anti-reflective coating.
• 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.
• 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.