Find out first if your DSLR is sensitive enough for IR photography before wasting money on an IR filter.
The Nikon D70 is an excellent IR Camera, while the Canon 300D is not. In fact, I don't think any Canon
DSLR is good for IR photography without heavy modification. Earlier Nikons such as the D70 and D70s
are great while some, like my D300, are not. Do some research before buying the IR filter.