Quote Originally Posted by Old-N-Feeble View Post
Will a Schneider #4 Center Filter work properly (well enough) with a Fujinon 125mm NSW for up to 5x7+ coverage? If so then what is the optimum aperture?
I suspect you mean a 125mm NWS from around 1981 vintage - The image circle is given as 198mm (http://www.thalmann.com/largeformat/ws-nws.htm). The 135mm NSW will cover 5x7, and if you can find an early version with lettering on the inside of the barrel, it will give you room for (modest) movements.