Equating different filter numbers.

[AndySig]

I've managed to get a bit confused recently while looking into the subject of filters for black and white and infrared photography.

On the one hand there is the B&W system of numbers and on the other there are things like Wratten numbers (American? Kodak?)

Is there a table available anywhere which shows where the various nomenclatures equate? I need this because if e.g. a book recommends a filter with a certain Wratten number, I need to be able to translate it to a B&W number as those are the filters which are most readily available to me.

[sevo]

Wratten numbers are a grown mess of internal catalogue numbers - these aren't even meaningful for colour correction/balancing filters (where the other system uses a combination of a letter for hue and number for the mired shift). As far as black and white filters are concerned the German numbering used by B+W (as far as I know originating with Schott, the glass maker of Zeiss) is not that much better, though.

The B+W handbook lists the Wratten number in brackets adjacent to the German number: https://www.schneideroptics.com/pdfs...ndbookFull.pdf