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<blockquote data-quote="BackdoorArts" data-source="post: 247830" data-attributes="member: 9240">1. Go with a 9-10 stop filter as others will never slow a waterfall down enough on a sunny day, and you can always raise ISO with a 9-10 stop to match the lesser filters (1, 2, 3 stop) but not the other way around.2. Go with a larger filter (77mm or larger), but invest in step rings.&nbsp; They are cheap and will a) prevent any accidental movement from bumping in to the camera while holding it, and b) will prevent any accidental reflections and stray light issues if they are held too far away.3. Avoid variable ND's at all costs.&nbsp; They work well up to about 6 stops and then begin to produce hot spots and lines.&nbsp; I've bought and returned 3 &quot;good ones&quot; and they were all the same.4. If you have a smart phone download the NDTimer app.&nbsp; It will tell you precisely what your exposure should be when you plug in the exposure without the filter.&nbsp; It will also allow you to stack multiple ND filters if you ever want to do that.&nbsp; 5. Always meter in direct light first and not through the 9-10 stop, it will be more accurate - unless removing is problematic, in which case be prepared to work in Aperture Priority mode once for a test shot, then plug those settings into Manual and adjust accordingly depending on how the first shot works.</blockquote>

[QUOTE="BackdoorArts, post: 247830, member: 9240"] 1. Go with a 9-10 stop filter as others will never slow a waterfall down enough on a sunny day, and you can always raise ISO with a 9-10 stop to match the lesser filters (1, 2, 3 stop) but not the other way around. 2. Go with a larger filter (77mm or larger), but invest in step rings. They are cheap and will a) prevent any accidental movement from bumping in to the camera while holding it, and b) will prevent any accidental reflections and stray light issues if they are held too far away. 3. Avoid variable ND's at all costs. They work well up to about 6 stops and then begin to produce hot spots and lines. I've bought and returned 3 "good ones" and they were all the same. 4. If you have a smart phone download the NDTimer app. It will tell you precisely what your exposure should be when you plug in the exposure without the filter. It will also allow you to stack multiple ND filters if you ever want to do that. 5. Always meter in direct light first and not through the 9-10 stop, it will be more accurate - unless removing is problematic, in which case be prepared to work in Aperture Priority mode once for a test shot, then plug those settings into Manual and adjust accordingly depending on how the first shot works. [/QUOTE]

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