Optical Accessories

High quality filter for CMOS photography with the following features:

• 1st band, CWL495nm FWHM35nm
• 2nd band, CWL 660nm FWHM 35nm
• 1mm thick optical glass with 30 arc sec parallelism.
• UVIR Block and Anti-Reflection Coating.

Altair DualBand 6nm Filter Features:

• Capture the two main emission nebulae bands at the same time, whilst suppressing light pollution, moonlight, and airglow.
• Acquire more data in less time, opening up your imaging window, even into the summer months when it isn't quite dark.
• If you have the 6nm Sii Oiii Ultra filter and the Ha Oiii version, you can capture twice the Oiii data in each imaging session and combine them for true SHO Hubble style imaging with a colour camera!
• Extremely steep bandpass yields maximum contrast in extreme light pollution: 6nm FHWM centred on 500.7nm Oiii wavelength, and 5.5nm 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, plus an anti-reflection coating for the ultimate in contrast.
• Best performance at focal ratios at F4.8 or slower, however can be used as fast as F3.6, with minimal contrast impact (conservative estimate - faster may be possible). Like any dichroic filter, contrast increases as focal ratio number increases. More info about light pollution filter performance and focal ratio here.

The new TriBand V2 Filter

• Anti-Halo coating on both surfaces to reduce reflection artefacts from reducers and camera lenses.
• Increased blocking of UV, IR and unwanted visual range wavelengths. UV OD7 (T0.00001%) Visual OD5 (T0.001%) and IR OD4 (T0.01%) for the ultimate in skyglow blocking. This is an order of magnitude better than foreign filters.
• Higher transmission % of desired wavelengths Ttop 93% (Average 5% higher transmission of target wavelengths than V1). In general a 5% gain on foreign filters.
• Ha at 14nm and Oiii at 34nm FWHM for with less tail-off to reduce unwanted light pollution, whilst keeping transmission high compared to the V1.

The Altair wide-field binoviewer allows vignetting-free observations with almost all 1.25" eyepieces through oversized prisms.

• Clear aperture 28 mm / prism diameter 30 mm
• 1.25 connection on the telescope
• Prism surface Lambda/8
• Self-centering eyepiece connection for perfect fit of the eyepieces, also with safety groove
• Built-in micro focuser for diopter compensation on each side
• Short design with only 118.5 mm optical path - can be used with many refractors without compensating the optical path
• Robust transport and storage case included in the scope of delivery

Fast 60mm viewfinder with helical focuser and tube clamps

Key data

• 60mm aperture
• 225mm focal length at a focal ratio of f/3.75
• Illuminated crosshair eyepiece
• Helical focuser (the image does not rotate when focusing)
• Complete tube clamp set with mounting material
• Can also be used as a guidescope

• Batch-tested for consistency.
• High quality dichroic/dielectric coatings. 
• Anti-Reflection coating to reduce star-halos - stackable.
• UV/IR block for imaging - star bloat reduction with refractors.
• Ultra-flat glass by Schott Germany.
• Precision CNC machined filter cell for strain-free mounting and freedom from tilt.

• Batch-tested for consistency.
• High quality dichroic/dielectric coatings. 
• Anti-Reflection coating to reduce star-halos - stackable.
• UV/IR block for imaging - star bloat reduction with refractors.
• Ultra-flat glass by Schott Germany.
• Precision CNC machined filter cell for strain-free mounting and freedom from tilt.

With the TS ADC your images of moon and planets as well as your observations near the horizon become significantly sharper and more detailed.

• Corrects the color shift (Dispersion) of our atmosphere - less color fringing, more sharpness and detail
• Convenient operation with eyepiece attached - simply rotate the lever and notice how the sharpness of your view or camera image improves.
• The principle behind the ADC is simple - two prisms are shifted relatively to each other and thereby compensate the color shift of the atmosphere (see image)
• A ring scale allows for reproducable adjustments
• Simple adaptation on the telescope side and eyepiece side via 1.25" receptacle and T2 thread
• Ultraslim design - the TS ADC can even be attached to binoviewers - height without T2 connection parts only 29 mm from T2 to T2
• Usable among others for observation and photography of planets, the moon or double stars

• 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.