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The 400D should, like most DSLR’s, have a B (for Bulb) setting where you can make a manual exposure for as long as you keep the shutter release pressed. I’ve seen images here on IIS where members have taken 5 to 10 minute exposures using this technique, although this does bring its own challenges of tracking, noise in the image, etc.
I understand that a modified DSLR (filter removed) can have its White Balance customised to make terrestrial photos look natural/normal. However, I also believe that you would need to replace the removed filter with a same thickness optically flat glass filter to allow auto focusing to work accurately.
Cheers
Dennis
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