For the past several years I have been carrying a Linhof Universal lens finder which accurately gives the FOV for 4x5 lens from 90mm to 360mm and it's easy to translate to the particular camera format. For example the 240mm setting on the finder is equivalent to 80mm on 35mm, 165mm on 6x7, 240mm of course on 4x5, and 480mm on 8x10. The only drawback is its weight and bulk - especially the latter.
However the other day while getting some Nielsen Frames at a local art store I picked this up: http://www.colorwheelco.com/viewcatcher/ . I haven't been out with it yet but if I can get this to work it will solve the bulk and weight problem with the Linhof finder. It fits easily in the top pocket.
Thomas
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