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Originally Posted by janoskiss
There are transmittance vs wavelength curves around for both types of filters. Sorry, don't know where exactly, but I've checked them out before (just google). I believe the Sirius ones are not as selective, and peak transmittances are not as high; i.e. they look like cheap imitations of more expensive low/high/band-pass filters. I should emphasise that this is solely from looking at the manufacturers' data (which can of course be fudged), not through the eyepiece.
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I wonder whether the transmittance vs wavelength curves are the real thing or just look good to print in ads. I saw the ads in Sky and Space and AusSky and Telescope as well. If anyone has those baader filters in Victoria I'd like to borrow them for a day or two and I'll analyse and print out the real spectrum (I service spectroscopy instruments so it's very easy for me to do a quick scan on a filter or two). It's no big deal but I wonder...