Suppresses the secondary blue spectrum when using achromatic and half-apochromatic refractors (increasing image sharpness).
For visual and photographic planetary observations.
Enhances contrast between the belts on Jupiter.
Increases contrast of the lunar and Martian surface.
Multi-coated for max contrast, no reflections, scatter or dimming.
Planeoptically polished to within 30 seconds of arc for a sharp image at high magnification with non-ageing sealed coating edges.
Both sides 7-layer AR coating with only 0.25% residual reflection per surface. This is the most antireflective that has ever been undertaken with color filters.
We can say a bit more about these filters. If you have an Achromat, these will significantly help with clarity and fringing as well. It allows a lot of the light through while still eliminating the purple fringing. There is also less of a color shift compared with the #12 filter. It may also darken your suburban sky.
If you want to try a further experiment, try adding one of our Moon and Skyglow filters to it to restore much of the image neutrality.