Originally Posted by
pocketfulladoubles
I use a homemade card. Basically, I took a piece card stock and cut out a 4x5" hole, and affixed a piece of string coming from just beneath the bottom of the cutout. Then for each lens, I held the card out at a distance to match the ground glass focused on some landscape scene. I place a small tab on the string that I could bite on, and labeled it the focal distance of that lens. So, in essence, the string will have as many tabs as you have lenses, and you can walk around looking at things through the card. When you find something, just pull the string to your teeth and pick the closest one, selecting a shorter focal distance if in-between, and crop.
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