My tokina 12-24 I have rarely gotten to use. I have upcoming trips where it will be handy. I did buy a slim mount multi coat CP for it. How important and at what focal length does it matter if you use a slim mount filter. I need a few NDs a grad ND and misc. filters. I have found the focal length I use the most to be 15-17mm.. I am worried when I need 12-14. Mainly landscape and waterfallfs as you may imagine. Thanks in advance.
Marc
Ken (http://www.kenrockwell.com/tech/digital-wide-zooms/comparison-filters.htm) has you covered.
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