Antlia M48 Adapter with Triband RGB II Ultra Filter for Canon EF/EF-S cameras (Antlia, SKU: M48-RGB II-EF/EF-S) connects a camera with a Canon EF or EF-S mount to an M48 × 0.75 interface, allowing it to be attached to a suitably terminated astrophotography imaging train. The integrated Triband RGB II Ultra filter reduces the effects of selected artificial-lighting bands while maintaining transmission of spectral ranges useful for imaging broadband targets and emission nebulae. The construction provides a back focus of 55 mm.

Key features

• combination of a Canon EF/EF-S camera adapter and light-pollution filter in one component
• M48 × 0.75 interface designed for use with a suitably terminated astrophotography imaging train
• back focus of 55 mm
• multi-band transmission characteristics covering important RGB spectral ranges and the Hα, NII, SII, OIII and H-beta lines
• reduction of the effects of selected artificial-lighting bands on captured data
• balanced transmission helping to reduce colour cast in broadband targets
• suitable for imaging galaxies, emission and reflection nebulae, and star clusters
• broad transmission bands designed for use with optical systems as fast as f/2
• characteristics suitable for use with colour and monochrome sensors
• coatings developed to reduce halos and internal reflections

Set contents

• Antlia M48 adapter for Canon EF/EF-S cameras with integrated Triband RGB II Ultra Filter

Technical specifications

• product type: camera adapter with integrated light-pollution filter
• camera mount: Canon EF/EF-S
• telescope-side interface: M48 × 0.75
• back focus: 55 mm
• filter type: Triband RGB II Ultra multi-band filter
• Hα wavelength: 656.3 nm
• NII wavelengths: 654.8 nm and 658.3 nm
• SII wavelengths: 671.6 nm and 673.1 nm
• OIII wavelengths: 495.9 nm and 500.7 nm
• H-beta wavelength: 486.1 nm
• peak transmission: over 92% for Hα, NII, SII, OIII and H-beta
• out-of-band blocking: at least OD4 over the 300–1050 nm range
• filter substrate thickness: 2 ± 0.05 mm
• compatible optical-system focal ratio: down to f/2
• sensor compatibility: colour OSC and monochrome
• application: astrophotography of galaxies, emission and reflection nebulae, and star clusters
• SKU: M48-RGB II-EF/EF-S

The Antlia adapter allows a Canon EF or EF-S camera to be connected to an M48 astrophotography imaging train while reducing the effects of light pollution without requiring a separate filter holder.