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http://www.johnsexton.com/newsletter12-2010.html
Scroll down for some info:
http://www.johnsexton.com/newsletter12-2010.html
I use a card with a 4x5 cutout. Attached to the center of one long side is a 1 meter string with a knot every 10 cm and tic marks with a magic marker every 1 cm between knots. I can either frame and pull string to my spot, or hold the string at the focal length I have to use and see what is in the " Finder ". Advantage of full size 4x5 is the distance between tic marks gets easier to use when trying to hold string with shorter lenses, Besides when shooting 8x10 ( double string measurement ) , the 4x5 is small.
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