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Okay, interesting results. I also have a 30nm Ha filter and a GSO red filter.
With the red laser pointer the GSO red filter lets through all the light, the 30nm Ha lets through most of the light and the ebay 650nm filter blocks about half the light. Also tried a CLS filter. The CLS lets through more laser light than the ebay 650.
The DVD test was a bit vague. I used a DVDR. Out of the 3 filters, the ebay 650nm filter showed a thin red line, not a spot as such. With the other 2 filters the line was thicker.
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