« on: February 12, 2015, 12:35:55 PM »
That being said, if you do wish to use the LEE gels in the gelatin filter holder, I'd recommend this over the filter set you mentioned above -
0.9 ND 21"x24" sheet for $ 7.50, probably more worth the money spent.
these type of gels are for lights only and not for lenses. they're not optically pure by any standard, and will degrade image quality. better to stick with kodak wratten filters or lee polyester filters, especially on a $3000 lens.