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No worries, I have a canon 600d which may be slightly different to the 450d. I had the infra red cut replaced with a clear bit of glass the same depth to maintain autofocus. however, I see you are looking at refractors to use it with? If that's the case I think it's preferable to get an astro ir cut filter (which allows more h-alpha through than the standard ir filter) otherwise the colour is affected ... i use a reflector and it doesn't happen apparently.
Check out the equipment DIY forum section I'm sure I saw some good info there about a month ago. I paid ~500 ...
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