But of course Paul!
Filter: $45 + $10 postage from
Telescopes & Astronomy in SA, for a 30x30 cm sheet of film.
Cell: Made using instructions
here
And that's it, it was really easy.
I'll be putting up on the
Projects section, maybe tomorrow, but it won't really contain any more information than what i've just given you
Well worth it for the low cost.
I'm not sure how the cell would work on a SCT, I guess it wouldn't be too much different.