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A round 2 inch glass filter in a black metal cell

Baader Planetarium

Baader Planetarium 2 inch 7.5 nm Solar Continuum Filter

SKU CH-PNEF-FGHHD

A 7.5 nm narrowband filter transmitting at 540 nm to enhance solar photosphere contrast for visual and photographic use

  • Superior contrast reveals intricate solar details with 7.5 nm narrowband filtration
  • Peak transmission at 540 nm central wavelength across 535–545 nm range
  • Sharp monochrome imaging on CMOS cameras by suppressing atmospheric turbulence
  • Reflex-Blocker hard coating minimizes reflections for maximum light throughput
  • Optimized for 540 nm where eye sensitivity and lens sharpness are highest

Solar Continuum Filter for white-light observation

This Baader Planetarium 2 inch 7.5 nm Solar Continuum Filter is a narrowband photosphere filter designed for solar viewing and imaging. It transmits a 7.5 nm band centred on 540 nm to boost contrast and reveal fine surface detail. The Reflex-Blocker hard coating reduces reflections and maximises light throughput. It suits visual observers and photographers who want sharper monochromatic solar images.

Ideal for monochrome imaging

The filter performs best with monochrome cameras and apochromatic, catadioptric or pure mirror telescopes. It suppresses atmospheric turbulence to sharpen images at the eye's peak sensitivity. Buyers using colour cameras will see less benefit because the narrow passband discards most colour information. Observers needing wider spectral coverage for prominence or chromosphere work should look at dedicated H-alpha or Ca-K filters instead.

7.5 nm passband centred on 540 nm defines

This single specification determines whether the filter matches your setup. The 535–545 nm transmission window isolates the solar continuum for maximum photospheric contrast. If your telescope and camera work well in this narrow green window the filter will deliver the sharpest possible white-light detail. If your imaging requires broader colour data or hydrogen-alpha wavelengths this filter will not meet that need.

Highlights

  • Superior contrast reveals intricate solar details with 7.5 nm narrowband filtration
  • Peak transmission at 540 nm central wavelength across 535–545 nm range
  • Sharp monochrome imaging on CMOS cameras by suppressing atmospheric turbulence
  • Reflex-Blocker hard coating minimizes reflections for maximum light throughput
  • Optimized for 540 nm where eye sensitivity and lens sharpness are highest

Specifications

No published specifications for this item yet.

Questions about this item

How can I verify the 7.5 nm Solar Continuum Filter is performing correctly after installation?

Point the telescope at the Sun using a certified white-light energy-rejection filter in front of the aperture; the solar disc should appear sharp with high-contrast granulation and no ghost reflections, confirming the 540 nm central wavelength and 7.5 nm bandpass are working.

What does the package contain and what extra items are required?

The box holds the 2 inch 7.5 nm Solar Continuum Filter with Reflex-Blocker hard coating; you must supply a certified white-light energy-rejection filter for the telescope front, a 2 inch diagonal or eyepiece holder, and a camera or eyepiece.

Which filter specification should I choose for visual versus photographic use?

This single 7.5 nm bandpass centred at 540 nm covers 535–545 nm; it is optimised for visual observation and monochrome CMOS imaging, while colour cameras receive reduced benefit.

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