Colour Magic 2″ Duo-band C Package(C1+C2)

Askar's Duo-Band C1 and C2 Pack: A Versatile Solution for Exploring the Deep Sky in Ha, OIII and SII

Askar's C1 and C2 Duo-Band pack is the ideal tool for astrophotographers who want to maximize their deep-sky imaging possibilities without breaking their budget. By combining the C1 (Ha + OIII) and C2 (SII + OIII) filters, this pack offers complete coverage of the main wavelength bands, enabling the capture of a wide range of details in nebulae and other celestial objects.

C1 filter: Ha and OIII for bright, contrasted images

The C1 filter is designed to capture Ha (Hydrogen Alpha) and OIII (Oxygen III) emissions, two wavelengths essential for highlighting the fine, luminous structures of nebulae. With a wide bandwidth of 35 nm for OIII and 15 nm for Ha, it lets through a significant amount of light, enabling clear, high-contrast images to be captured, even without the need for long exposures. Its peak transmission of over 90 % guarantees optimum brightness, making this filter perfect for moderately dark observation environments.

C2 filter: SII and OIII for rich detail and enhanced contrast

The C2 filter, meanwhile, is designed to capture the SII (Sulfur II) and OIII (Oxygen III) bands, opening up the possibility of capturing additional detail in nebulae. Its wide bandwidth of 35 nm for OIII and 15 nm for SII enables more light to be collected, which is particularly useful for fast shooting and brighter imaging. Like the C1, the C2 filter offers a peak transmission of 90 %, guaranteeing images with enhanced contrast, with details clearly visible in the SII and OIII bands.

An Affordable and Versatile Solution for Astrophotography

One of the main advantages of this Duo-Band C1 and C2 package is its exceptional value for money. Thanks to their relatively wide bandwidths, C1 and C2 filters are more affordable than ultra-narrow-band filters, while still offering outstanding performance. This pack is therefore ideal for amateur and intermediate astrophotographers who want to explore a wide spectrum of nebular emissions (Ha, OIII, and SII) without breaking the bank.

Although the wide bandwidths may let through a little more stray light in high light pollution, they also allow brighter images to be captured in less polluted environments or with shorter exposure times. This compromise makes this pack particularly suitable for moderate observation environments, offering increased flexibility for a variety of conditions.

Askar's C1 and C2 Pack: An Entrance to the Beauty of the Deep Sky

In short, Askar's Duo-Band C1 and C2 pack is a versatile, cost-effective solution for astrophotography enthusiasts. It lets you explore Ha, OIII and SII bands in depth, offering a wealth of options for capturing fascinating details of nebulae and other deep-sky objects. With optimized image quality and excellent value for money, this pack is the perfect choice for those wishing to take their first steps or enrich their astrophotography practice without compromise.

Technical specifications

1. Duo-band C1 filter (2")

• FWHM: OIII at 35 nm ± 5 nm, Ha at 15 nm ± 3 nm
• Center wavelength (CWL): 500.7 nm and 656.6 nm
• Peak transmission: 90 %
• Thickness: 2 ± 0.05 mm
• Barrier properties: OD3 from 200 to 1000 nm
• Surface finish: 60/40

This filter is ideal for astrophotography enthusiasts looking for a versatile solution for capturing both Ha and OIII emissions. With a transmission of 90 %, it guarantees clear, bright capture of nebulae.

2. Duo-band C2 filter (2")

• FWHM: OIII at 35 nm ± 5 nm, SII at 15 nm ± 3 nm
• Center wavelength (CWL): 500.7 nm and 672 nm
• Peak transmission: 90 %
• Thickness: 2 ± 0.05 mm
• Barrier properties: OD3 from 200 to 1000 nm
• Surface finish: 60/40

This filter is an excellent option for those wishing to capture SII emissions in addition to OIII. The combination of OIII and SII bands provides high-resolution images of nebulae with excellent clarity.

3. Duo-narrowband D1 (2") filter

• Width at half maximum (FWHM): OIII at 6.5 nm ± 0.5 nm, Ha at 8.5 nm ± 0.5 nm
• Center wavelength (CWL): 500.7 nm and 656.6 nm
• Peak transmission: 85 %
• Thickness: 1.85 ± 0.05 mm
• Barrier property: ≥OD5 from 200 to 1100 nm
• Surface finish: 60/40

This filter offers a narrower bandwidth, ideal for users looking to enhance the contrast of celestial objects while blocking light pollution sources. The narrow OIII and Ha bandwidths are particularly useful for urban environments where light pollution is intense.

4. Duo-narrowband D2 (2") filter (Super D)

• FWHM: OIII at 6.5 nm ± 0.5 nm, SII at 8.5 nm ± 0.5 nm
• Center wavelength (CWL): 500.7 nm and 672 nm
• Peak transmission: 85 %
• Thickness: 1.85 ± 0.05 mm
• Barrier property: ≥OD5 from 200 to 1100 nm
• Surface finish: 60/40
• Parallelism: 30″

The Super D2 Duo-narrowband filter, Askar's latest innovation, is designed for high-precision astrophotography. Featuring "Super" halo control capability, it dramatically improves the contrast of your images and eliminates unwanted halos around stars. This filter is optimized for optimum performance, even with fast telescopes up to f/1.9, delivering clear, detailed images of nebulae by capturing only specific SII and OIII band emissions.