I would have thought that Google would find my answer, but the pages always seem to miss key issues which elude me.
In short I want to find out what the filter factors or compensating aperture adjustments are for the filters, which I managed to purchase at a photo swap meet (as a group, therefore the overlap).
They are the following Tiffen filters:
Green 11
Orange 16
Deep Yellow 15
Red 25
Yellow 8
Yellow KZ
They are all identified on the following Tiffen web site, except for the last one:
http://www.tiffen.com/results.html?s...w-In&page_no=3
but no where is the filter factor given on the Tiffen site
nor did this following general explanation of filter factors help me:
http://en.wikipedia.org/wiki/Filter_factor
It is not evident that the Wratten number is the same as the Tiffen number. The wratten number 11 is for Yellow/Green, but my Green 11 is quite a deep green as shown on the Tiffen web page ( 11 Green 1) which causes me to doubt the Tiffen numbers are the same as the wratten numbers.
Can anyone point me to the correct reference?
Thanks
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