Thank you all.
isane, I am a newbie in using the IR filter, the IR photos you posted here are terrific, in using the IR filter please be awared of the following :
" Never, ever view the sun directly through an IR filter, however black it may appear. "
this extract from the below web, I don't know the exact meaning of " black it ", it seems it is harmful to human eyes.
http://www.cliffshade.com/dpfwiw/ir.htm
to ensure you will recieve this message, I have sent you a PM as well.