Quote Originally Posted by ic-racer View Post
Of course, thank you.

Anyway, getting back to the topic on hand I would predict a speed advantage using the Ilford #5 filter. I'm surprised I did not test for speed when comparing the #5 to all my magenta dichroic filters. But if you just look at the #5 you see it is not just a magenta filter. I suspect the #5 has some some unique spectral parameters, but Ilford does not give the specs. I have subsequently given away my Ilford filters so can't test it now.
I'd be glad to send you a spare set. You make a very interesting point here. I've wondered why when examining the current Ilford MG filters, the #3 seems to visually appear the most Magenta in colour, and the higher numbers look more orange again.