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Baader Semi-APO Filter

3 In Stock - Ships Today if Ordered by 2pm EDT! (Mon - Fri)
$119 CAD
We will price-match in-stock Canadian astronomy dealer pricing


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  • Two filters made into one for maximum brightness
  • Combines Fringe-Killer with Moon & Skyglow for Semi-APO contrast with refractors
  • Non-ageing sealed coating edges

Combination of "Neodymium Moon & Skyglow" and "Fringe Killer" Filters

Time and time again we were made aware of customers who were combining our Neodymium Moon and Skyglow filter with our Fringe Killers to deliver amazingly colour-corrected images to achromatic refractors. This combination however did produce reflections.

After analyzing these reports we developed our Baader Semi-APO filter with IR blocker, a reflection-free combination of the Moon & Skyglow with a stronger coating of the Fringe killer. This result was a virtually colour-neutral image without the blue and red halos (violet fringing) and an increase to image contrast.

Additional Information

Manufacturer Baader Planetarium
Weight (kg) 0.062
Transmission Range multiple bands (see spectral image)
Filter Thickness (without cell) 1 mm
AR-Coating Phantom Coating® Group, planeoptically polished
Filter Usage CCD, Color Correction, IR-Cut
Filter mounted Mounted (LPFC 6mm)
Type of Filter Bandpass
Single or Set? Single Filter
Filter shape round

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