Optical Accessories

Antlia 2" 3 nm S-II ultra - narrow band filter for astrophotography - images with extreme contrast even with strong light pollution

• 2" mounted with low-profile filter cell
• Suitable for telescopes and lenses with a focal ratio of f/3 and lower
• Schott optical base substrate
• Blackened edges to avoid internal reflections
• Extremely narrow bandwidth of only 3 nm for maximum contrast
• Central wavelength 671,6 nm
• Filter thickness 2 mm
• Comes in convenient plastic transport box

Antlia 1.25" 3 nm S-II ultra - narrow band filter for astrophotography - images with extreme contrast even with strong light pollution

• 1.25" mounted with low-profile filter cell
• Suitable for telescopes and lenses with a focal ratio of f/3 and lower
• Schott optical base substrate
• Blackened edges to avoid internal reflections
• Extremely narrow bandwidth of only 3 nm for maximum contrast
• Central wavelength 671,6 nm
• Filter thickness 2 mm
• Comes in convenient plastic transport box

Antlia 2" 3 nm O-III ultra - narrow band filter for astrophotography - images with extreme contrast even with strong light pollution

• 2" mounted with low-profile filter cell
• Suitable for telescopes and lenses with a focal ratio of f/3 and lower
• Schott optical base substrate
• Blackened edges to avoid internal reflections
• Extremely narrow bandwidth of only 3 nm for maximum contrast
• Central wavelength 500,7 nm
• Filter thickness 2 mm
• Comes in convenient plastic transport box

Antlia 1.25" 3 nm O-III ultra - narrow band filter for astrophotography - images with extreme contrast even with strong light pollution

• 1.25" mounted with low-profile filter cell
• Suitable for telescopes and lenses with a focal ratio of f/3 and lower
• Schott optical base substrate
• Blackened edges to avoid internal reflections
• Extremely narrow bandwidth of only 3 nm for maximum contrast
• Central wavelength 500,7 nm
• Filter thickness 2 mm
• Comes in convenient plastic transport box

Antlia OAG and filter drawer assembly is an innovative accessory that integrates filter drawer and OAG.

• Large 12*12 mm pick-out prism for using a larger guiding sensor, therefore greater choice of guide stars.
• Mono-block (one-piece) design with the OAG body directly connected to the filter drawer - provides a very rigid platform for guiding.
• Comfortably fits APS-C sensor and full frame sensor.
• The total thickness plus both side adapters is 37.5 mm.
• Right for cameras with 17.5 mm back focus distance without additional adapters.
• A high-quality 1.25-inch helical focuser with a generous 10 mm of travel allows you will find the optimum focus for your guide star.
• The prism height can be adjusted to better illuminate the field of view of your auto guider. The smaller the imaging sensor in your camera the further down the prism can be set without interfering with the sensor.
• Dovetail-type threaded adapters are attached to the body with grub screws, so the adapters can be 360° rotated and locked to align with the telescope and camera.
• You can rotate the OAG 360° to find a guide star.
• Telescope-side connections (female thread): M48, M54, M68
• Camera side connections (male thread): T2 (M42x0.75), M48, M54, M68
• Connection adapters also fit to the respective other side
• Suitable for 2" filters

Antlia 3 nm H-Alpha ultra - narrow band filter for astrophotography - images with extreme contrast even with strong light pollution

• 2" mounted with low-profile filter cell
• Suitable for telescopes and lenses with a focal ratio of f/3 and lower
• Schott optical base substrate
• Blackened edges to avoid internal reflections
• Extremely narrow bandwidth of only 3 nm for maximum contrast
• Central wavelength 656.3 nm
• Filter thickness 2 mm
• Comes in convenient plastic transport box

Antlia 3 nm H-Alpha ultra - narrow band filter for astrophotography - images with extreme contrast even with strong light pollution

• 1.25" mounted with low-profile filter cell
• Suitable for telescopes and lenses with a focal ratio of f/3 and lower
• Schott optical base substrate
• Blackened edges to avoid internal reflections
• Extremely narrow bandwidth of only 3 nm for maximum contrast
• Central wavelength 656.3 nm
• Filter thickness 2 mm
• Comes in convenient plastic transport box

Antlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia H-alpha 3nm Pro filters are designed to deliver 88% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.

• Basic Substrate: Schott optical substrate
• Filter Thickness:   2mm+/-0.05mm for Dia31mm
• FWHM (Full width at half maximum): 3nm
• CWL (Central Wavelength): 656.3nmnm
• Peak Transmission: ?88%
• Blocking: > 5 OD(0.001% out of band blocking) @ 300-1000nm
• Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
• Transmitted Wavefront: Lambda/4 or better.
• Parallelism: less than 30 arcsec
• Single / Non-glued substrate

This filter was developed to suppress light pollution for colour and monochrome cameras and offers more balanced RGB colours.

• ltair TRI-RGB is great for broadband objects such as mixed emission / reflection nebulae, comets, dust clouds and galaxies, but it also allows the major emission nebulae lines through. It covers both broadband AND narrowband targets.
• TRI-RGB complements the Altair TriBand and DualBand filters by adding star colours.
• TRI-RGB and works with fast or slow focal ratio telescopes and camera lenses. 
• TRI-RGB is not only for light pollution control. It works very well under dark skies too by enhancing colour purity, airglow and reducing channel crossover in colour CMOS and DSLR cameras.
• Although primarily intended for colour cameras, TRI-RGB can be used for a cleaner luminance channel with a mono camera. 
• High transmission peaks with steep sides enhance contrast, together with almost total suppression of unwanted light, at OD4/5 (0.01%~0.001%) over the majority of unwanted visual wavelengths.