ok, I need help. Can someone explain to me the difference in large format lenses??? How many kinds are there? The mounting-how is it done???? Are the shutters alw ays seperate? How does one set the exposure speed? Also, I keep seeing pictures of 4x5 backs that seem to have another frame over the groundglass, this thing h as two tabs on the left side. What is this for??? Mine doesnt have one. Is it just another variation of a back??? thanks a million in advance
P. O'B.
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