Centre Filter = 30mm lens

[davidjt]

Is there an alternative to the hassie centre filter for the 30mm lens - I have marked mine and would like to replace it if it doesnt break the bank. I use helipoan or hoya on LF camera. What is the light fall-off ?
Thanks
Dave

[Finder]

I would e-mail Hasselblad for confirmation, but I think a 3x or 1.5 stop center filter is what you want.