ok, This is a long winded response, be prepared......
Here is the deal. 1 Film IR is better than digital IR because it does capture more detail and it is more sensitive to the IR spectrum.
However, to the layperson (not a photographer), a digital image and a film image held up next to each other, they will not be able to see the difference without it being pointed out to them.
End of that argument.
The shots with digital camera will come out red out of the camera. Best thing to do is shoot in raw and apply a software custom white balance. That is MY OPINION...don't argue with it, it is not a statement of fact, it is the best method I have found. Other ways are to shoot a custom white balance and use that for all your shots, however do to the movement of the sun, refraction of the atomsphere and about a billion other factors the white balance will need to be reshot throughout a day of shooting as the color of the light from the sun will change dramatically throughout the day.
I use a software white balance that I set in my camera raw software during processing, YMMV, Use your own best method.
once your white balance is set in raw software then your image will look more like IR.
I personally don't typically shoot IR in jpg mode, (ok, I have never shot IR in jpg mode) because I don't know of a way to change the white balance and therefore the shot will be red because the r72 filter I use filters everything above the red spectrum and most of visible red as well.
Just realized you stated you had a D70s. Shoot in RAW, you will be much happier with the results. They will be red coming out of the camera. You have to process them on your computer before they will look like film IR.
The D50 and the D70s both use the exact same sensor. with Digital IR you have the option of processing the photo to B&W IR or what is refferred to as False Colour IR. I personally prefer false colour, as does a friend of mine whose gallery is
here.
Cheers,