Smale båndfiler ZWO H-alpha, SII, OIII 7nm - 31mm sirkulær ikke montert

ZWO H-alpha, SII, OIII 7nm narrowband filters are designed for astrophotography and allow you to achieve "Hubble-like" images. By selectively reducing the transmitted wavelengths, these filters suppress the effects of public lighting and the Moon.

The aluminum cell is manufactured by CNC machines that impose high precision manufacturing. The filter is available in 4 formats, including a non-mounted circular format of 31mm.

Technical Specifications

• FWHM (Full Width at Half Maximum) : 7nm (+/-0.5)
• Passband: 90% on Ha/S-II/O-III lines
• Infrared cutoff (700/1100nm)
• Schott glass
• Glass thickness: 1.85mm
• Precise optical polishing to ensure a precise wavefront at lambda/4 and parallelism <30" of arc on both surfaces
• Double-sided optical coating
• Anti-reflection treatment
• Aluminum cell construction machined under CNC

Usage

These filters are ideal for CCD imaging, digital photography (modified camera) and allow you to enhance the contrast of nebulae.