Hey Bill! Thanks again for the advice. Specifically in reference to the Hoya 25a filter, if you look at this page http://www.bhphotovideo.com/c/produc...d_25A_HMC.html and click on the specifications tab and go down to the filter factor it says: 3 (+2 stops). This has me slightly confused because I am being told 3 stops by most for a 25a. What do you think?