Baader Semi-APO Filter

Baader PlanetariumSKU: 2458398

Size: 1.25"
Sale price$124 CAD
In stock: 3 unit(s) - Most orders placed by 2PM EST will be shipped out the same day (weekdays)

Customer Reviews

Based on 1 review
Works OK

It does remove some of the chromatic aberration but makes the moon look yellow and does remove some of the brightness/sharpness on planets.


  • 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. 


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

Additional Resources

You may also like

Recently viewed