Doremus,
Take your filters and meter outside and hold them up to the blue sky opposite the sun and see what you get. I did that this afternoon after my bike ride and this is what I got:
Deep Yellow 15 (Tiffen glass filter): 15.4 EV sky, 13.6 EV sky and filter. (Tiffen 1-2/3/stops).
Yellow Z001 (Cokin resin filter) 15.4 sky, 14.1 sky and filter (Cokin 1 stop).
Green Z004 (Cokin resin filter): 15.4 sky, 13.4 sky and filter. (Cokin 2-stops).
Blue Z020 (80A) (Cokin resin filter): 15.4 sky, 14.0 sky and filter. (Cokin 1-1/3 stops).
Blue Z021 (80B) (Cokin resin filter): 15.4 sky, 14.3 sky and filter. (Cokin 1-stop).
Red Z003 (Cokin resin filter): 15.4 sky, 11.4 sky and filter. (Cokin 3-stops). 1 stop off.
Orange Z002 (Cokin resin filter): 15.4 sky, 12.8 sky and filter. (Cokin 1-1/3 stops). 2-2/3 stops off.
Red Z007 (IR) (Cokin resin filter): 15.4 sky, 7.5 sky and filter. (Cokin ? - Amazon says 6 stops).
Light yellow-warming (81B): 15.4 sky, 14.8 sky and filter. (Cokin 1/3 stop). 1/3 stop off.
Sekonic L-758 DR light meter.
Thomas
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