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After a quick look, part of the difference could be in the flux throughput's? I think Gerd Neumann at Astronomik has been working hard on getting a narrower band pass while maintaining a very high throughput in his new filter line? According to the Baader website the 7nm Baader Ha has a transmission of only about 87% compared to the nearly 98% of the narrower Astronomik 6nm. The Baader SII is at 8nm and only about 91% throughput compared to 97.4% for the Astronomik at 6nm, the Baader OIII is at 8.5nm and throughput of about 87% compared to the Astronomik at 6nm and 93.5% transmission. So overall around 10% more throughput from the Astronomiks with slightly narrower band pass too.
Not sure on the throughputs of the 3.5nm Baaders but I would assume they would be less again..?
Mike
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