Categorys with formular containing "AND NOT"

[Hordor]

I want to create a category wich shows focal length in 35mm equivalents in custom ranges. (It schould help to clear my decisions for next lenses.) A formular like this works fine:

"@RFolder[file://H:/Master/]" AND "@MetadataTag[XMP::exif\FocalLengthIn35mmFilm\FocalLengthIn35mmFormat\0,between,0,16]"

I have some all-manual lenses which do not create EXIF-Data. I can find them with:

"@Variable[{File.MD.lens},contains-any,Unknown]"

So my idea was using something like this:

"@RFolder[file://H:/Master/]" AND "@MetadataTag[XMP::exif\FocalLengthIn35mmFilm\FocalLengthIn35mmFormat\0,between,0,16]" AND NOT "@Variable[{File.MD.lens},contains-any,Unknown]"

IMATCH doesn`t accept this. Any idea out there how to solve this? Is there a better way then using formulars?

[Mario]

Use NOT only not AND NOT

[Hordor]

Works fine, thanks!