From: Nick David Wright
I've been looking at graduated ND filters. And I have to admit, I've
always been a little confounded by them.
Every one I've ever seen the graduation starts smack in the middle of
the filter. But seeing as how the rules of composition dictate we are
to place our horizon either on the upper or lower third, I just don't
see how this kind of graduated filter would be very useful.
Now the Cokin system where you can adjust the filter up and down and
place the graduation exactly where you want it makes much more sense
to me.
But the Cokin filters are plastic and that doesn't appeal much to me
either, though I have used them extensively in the past.
Anyone have any thoughts?
My own experience is the Cokin ND grads are reasonably good optical
quality plastic.
Hitech, LEE, Singh-Ray and Tiffen all make filters to fit the Cokin
P-system holder.
http://www.bhphotovideo.com/c/buy/P-Series-Filters-Cokin-Tiffen-Hitech-Singh-Ray/ci/4032/N/4277997859
http://preview.tinyurl.com/2539q2a
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