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I have used several Astrodons, Baader Gen 1 and Astronomiks Gen 1.
The Astrodons are parfocal, do a 1:1:1 colour combine the others do not no matter what they say.
The Astronomiks are 1mm thin and the other 2 are 3mm. My filter wheel required the filter to be 3mm. I got one damaged because of this.
Then Gerd brought out a spacer later on and wanted $100 for them.
I am used to US style customer service and that would be called really slack in the US and increasingly here.
Apart from the poor customer service the filters themselves seemed ok. Not Astrodon standard but certainly fine.
Greg.
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