I have two lenses for my 4x5, a 90mm and 180mm. Both are modern lenses in moder n shutters, and I paid what I consider to be a fairly large sum for each, althou gh both were used. I need a longer focal length lens (300mm - 360mm, 12" -14"?) and am interested to know if anyone out there has experience with using older l enses with barrel mounts. What I wonder is if you where to use fairly long-ish exposures, could you get by without a shutter. I am imaging using a lens cap to expose film and simply time the exposures with a second hand on my watch. Is t his a doable idea? What are the pitfall I should think about? Any recommendati ons on what types of lenses I should be looking for? Thanks for your help.
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