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Thanks for posting the test results of the various IR filters. When I first modified the 450D I found the Baader DSLR replacement filter to be very clear in appearance. At first, I suspected that I was sent a clear filter by mistake. The instructions that come with the filter say to place the pink coated side in a certain direction, but even with very bright light at different angles, I could not determine which side was coated. My IR test results and discussion of the suspicion at the time are here:

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Gary,
First thanks for providing the indispensible modification instructions. I used them for modding both my 300D and XS.

I had the same suspicion when I received my sample of the Baader filter from Alpine a few weeks ago. Mine did not come with instructions so I had no idea about the pink coated side having to be in a certain direction, though like you I couldn't tell if there was a coating even under bright lights. I have already installed the filter but have yet to use it for astrowork since it has been cloudy and I had been on vaca for the holidays. I had sent an email to Baader about the possibility that I got a clear glass filter by mistake but they reassured me it was not. Now I have to send another email about the pink coated side issue. My mod of the XS went so well, I would just hate to have to take it apart again due to reversal of the "pink side" which I couldn't diffrentiate in the first place.

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Tom

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