Astronomik OIII 6nm CCD MaxFR 31mm Filter – Fast Optical Systems

Astronomik Narrowband Filters for Extremely Fast Optical Systems

There is increasing demand for filters designed for extremely fast optical systems, such as Celestron’s RASA and Takahashi’s Epsilon Astrographs. The Astronomik MaxFR series is specifically crafted to meet the requirements of deep-sky imaging, supporting fast optical systems. You can choose between 12nm and 6nm bandwidths (FWHM) for key emission lines like oxygen (OIII), hydrogen (H-alpha), and sulfur (SII).

MaxFR OIII-CCD Filter

The MaxFR OIII-CCD filter is available in both 6nm and 12nm bandwidths, offering optimal transmission for narrowband imaging. This filter ensures maximum contrast and detail capture, even in heavily light-polluted environments.

MaxFR H-alpha-CCD Filter

The MaxFR H-alpha-CCD filter is perfect for capturing the rich red emission lines from nebulae. With bandwidth options of 6nm and 12nm, you can select the filter that suits your imaging setup best.

MaxFR SIII-CCD Filter

The MaxFR SIII-CCD filter rounds out the set of essential filters for astrophotographers. Available in 6nm and 12nm bandwidths, this filter enhances the capture of sulfur emission lines, providing the depth and contrast needed for Hubble-like images.

Highest Transmission for Fast Systems

The MaxFR filters are built using advanced MFR Coating technology to block out-of-band wavelengths while providing excellent contrast, reduced stray light, and no halos. These filters are specifically designed for use with fast optical systems, ensuring needle-sharp stars and optimal data quality.

• 12nm Filters: Usable with systems from f/1.7 to f/8, providing about 85% transmission at f/1.4.
• 6nm Filters: Usable from f/2.2 to f/8, with approximately 90% transmission at f/2.

Enhanced Imaging for Light-Polluted Environments

When imaging from light-polluted areas, narrowband filters like the MaxFR series can dramatically improve image quality. H-alpha filters are ideal for capturing nebulae that glow red, while OIII and SII filters enhance imaging possibilities by revealing structures in greenish and blueish tones. Using these filters together allows you to create Hubble Space Telescope-like images, even in challenging conditions.

Quality Features of Astronomik MaxFR Filters

• MFR Coating: Offers perfect performance with all instruments down to f/1.4 (12nm filters) and f/2 (6nm filters).
• High-Quality Substrate: Made with striae-free, optically polished glass, ensuring no image distortion.
• Parfocal: All Astronomik filters are parfocal, meaning you won’t need to adjust your focus when switching filters.
• Durability: Scratch-resistant, moisture-proof, and age-resistant coating ensures long-lasting performance.
• Blocking: Blocks unwanted light from UV to IR wavelengths, eliminating the need for additional UV/IR blocking filters.
• Available Sizes: From 1.25" to square 50mm x 50mm filters.
• Comes with a high-quality protective storage box.
• 10-year guarantee for full performance and durability.

Choosing the Right Filter for Your Setup

If you’re using a DSLR or camera with limited dark current, the 12nm filters are an excellent choice. For extreme light pollution or if your camera has very low dark current, the 6nm filters offer the best contrast and star reduction, perfect for faint structures in star-crowded regions of the Milky Way.

Exposure Time and Imaging

While you don’t need to increase exposure time, the MaxFR filters allow you to extend exposures to capture fainter details. Thanks to high transmission rates, the filters block unwanted wavelengths, ensuring your images are not overexposed. This means you can expose for longer (up to 30 minutes) and capture more detail.

Selection Guide

Select the appropriate size and bandwidth (FWHM) to find the MaxFR filter best suited for your setup. Enhance your deep-sky imaging results with Astronomik filters today.