Hi Fred, i think you are partially correct.. only partially
If you look at Christians page, and Bobby's tutorial, he removed the Phaser Layer Infrared-absortion glass and replaced it with the Baader BCF Filter. The Phaser Layer Infrared-absortion glass suppose to block the IR range. By replacing this piece of glass with the BCF filter, it blocks out the UV range and a slight amount of IR range. (see attached BCF Filter graph). As you can see in the graph, the IR range with the BCF filter spikes at 1100nm to 80% then drops at 1160nm to 43%. This is the spike which needs to get filtered out. That is how the Baader BCF filter is designed that it doesn't block this IR range hence my image (see attach pic 2) i think it is in the middle of your 350D image and the 40D image. I can tell that your 350D image hasn't got any filters inplace that is why it is soo red compared to mine (not as red) but still red.
The Original Phaser Layer Infrared-absortion glass also blocks the much needed H-Alpha signal.
The lowpass filter is the filter which does the Anti-dust shake so that is why Bobby left it as this filter should not block out the required H-Alpha range. At this stage, my camera hasn't seen first light on astro objects so far.
to fix this for daylight use, I have gone with the Hutech Daylight front filter. For astro use, I still have the Hutech LPS2 filter which also blocks the UV/IR range.
That is why in my other post, holding the LPS2 filter infront of the lense, the image looks more normal than without because the LPS2 filter does indeed blocks the UV/IR range.
Let me know what you think Fred.