100x100mm 10 stop ND filter?

[kev curry]

Does anyone know where I might find a 100x100mm 10 stop ND filter in the UK, or anywhere else?

Thanks.

[Paul Fitzgerald]

you could process some FP-4 in roomlight in dilute developer to suit, it would be ND.

just a thought

[kev curry]

Thats a great idea Paul, worth some thought.
Cheers

[Mark Sampson]

That would be a Kodak Wratten #96 3.0ND filter. Not sure if Kodak still makes them or what a 4" square one would cost though.

[kev curry]

I'll have a search around for the Kodak ND. Would I be right in thinking that ND filters could be stacked together... say for example two 0.9 ND's together, would that make a 1.8 i.e 6 stop ND?

[Bob Salomon]

Why not use a screw-in one?

[kev curry]

I'm just thinking that now Bob after a look through Robert Whites site.
Thanks

[Michael Heald]

Hello! I got mine from B&H photo about 3 years ago when I was doing reciprocity testing of TMAX 400 and TMAX 100. Best regards.

Mike

[brianam]

As Bob mentions, round screw-in ones are readily available, e.g. from that NY mail-order house on 9th Ave. I use 6 and 10-stop ones in a couple sizes. A 20-stop is also available, which has tempted me, but that's r e a l l y L O N G exposure!

[speedtrials]

I've heard the glass from welding masks works well as a strong ND filter