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Hi Adrian
You could be correct as it is near a year since I had my last CA filter. I certainly had the Baader Semi-Apo and personally found the stacked combination of the moon and sky-glow filter with the fringe killer better than the single semi-apo (which is supposed to be these two combined anyhow). Whatever the case, I found the filter to significantly alter the general hue of the image through the ep as a product of controlling the CA. However, the Astronomik CLS diminishes the CA without imparting a huge hue in the process - hence why I thoroughly recommend it as the best even though controlling CA isn't its intended purpose. The Baader Contrast Booster is certainly the strongest CA filter I have encountered and if you are using something with terrible CA this is the one to use but it also gives the strongest hue..
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